/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*/
/*
*
* Lib i/o
*
* This file contains several functions to doing reads and writes.
* It was written so that a single function could be called in a test
* program and only a io type field value would have to change to
* do different types of io. There is even a couple of functions that
* will allow you to parse a string to determine the iotype.
*
* This file contains functions for writing/reading to/from open files
* Prototypes:
*
* Functions declared in this module - see individual function code for
* usage comments:
*
* int stride_bounds(int offset, int stride, int nstrides,
* int bytes_per_stride, int *min, int *max);
* int lio_write_buffer(int fd, int method, char *buffer, int size,
* char **errmsg, long wrd);
* int lio_read_buffer(int fd, int method, char *buffer, int size,
* char **errmsg, long wrd);
*
* #ifdef CRAY
* int lio_wait4asyncio(int method, int fd, struct iosw **statptr)
* int lio_check_asyncio(char *io_type, int size, struct iosw *status)
* #endif
* #ifdef sgi
* int lio_wait4asyncio(int method, int fd, aiocb_t *aiocbp)
* int lio_check_asyncio(char *io_type, int size, aiocb_t *aiocbp, int method)
* #endif
*
* int lio_parse_io_arg1(char *string)
* void lio_help1(char *prefix);
*
* int lio_parse_io_arg2(char *string, char **badtoken)
* void lio_help2(char *prefix);
*
* int lio_set_debug(int level);
*
* char Lio_SysCall[];
* struct lio_info_type Lio_info1[];
* struct lio_info_type Lio_info2[];
*
* Author : Richard Logan
*
*/
#ifdef __linux__
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#define _LARGEFILE64_SOURCE
#endif
#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/param.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/file.h>
#include <signal.h>
#include <stdint.h>
#ifdef CRAY
#include <sys/secparm.h>
#include <sys/iosw.h>
#include <sys/listio.h>
#else
/* for linux or sgi */
#include <sys/uio.h> /* readv(2)/writev(2) */
#include <string.h> /* bzero */
#endif
#if defined(__linux__) || defined(__sun) || defined(__hpux) || defined(_AIX)
#if !defined(UCLINUX) && !defined(__UCLIBC__)
#include <aio.h>
#endif
#endif
#include <stdlib.h> /* atoi, abs */
#include "tlibio.h" /* defines LIO* marcos */
#include "random_range.h"
#ifndef PATH_MAX
#define PATH_MAX MAXPATHLEN
#endif
#if 0 /* disabled until it's needed -- roehrich 6/11/97 */
#define BUG1_workaround 1 /* Work around a condition where aio_return gives
* a value of zero but there is no errno followup
* and the read/write operation actually did its
* job. spr/pv 705244
*/
#endif
/*
* Define the structure as used in lio_parse_arg1 and lio_help1
*/
struct lio_info_type Lio_info1[] = {
{"s", LIO_IO_SYNC, "sync i/o"},
{"p", LIO_IO_ASYNC | LIO_WAIT_SIGACTIVE,
"async i/o using a loop to wait for a signal"},
{"b", LIO_IO_ASYNC | LIO_WAIT_SIGPAUSE, "async i/o using pause"},
{"a", LIO_IO_ASYNC | LIO_WAIT_RECALL,
"async i/o using recall/aio_suspend"},
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
{"r",
LIO_RANDOM | LIO_IO_TYPES | LIO_WAIT_TYPES,
"random sync i/o types and wait methods"},
{"R",
LIO_RANDOM | LIO_IO_ATYPES | LIO_WAIT_ATYPES,
"random i/o types and wait methods"},
#else
{"r",
LIO_RANDOM | LIO_IO_TYPES | LIO_WAIT_TYPES,
"random i/o types and wait methods"},
{"R",
LIO_RANDOM | LIO_IO_TYPES | LIO_WAIT_TYPES,
"random i/o types and wait methods"},
#endif
{"l", LIO_IO_SLISTIO | LIO_WAIT_RECALL, "single stride sync listio"},
{"L", LIO_IO_ALISTIO | LIO_WAIT_RECALL,
"single stride async listio using recall"},
{"X", LIO_IO_ALISTIO | LIO_WAIT_SIGPAUSE,
"single stride async listio using pause"},
{"v", LIO_IO_SYNCV, "single buffer sync readv/writev"},
{"P", LIO_IO_SYNCP, "sync pread/pwrite"},
};
/*
* Define the structure used by lio_parse_arg2 and lio_help2
*/
struct lio_info_type Lio_info2[] = {
{"sync", LIO_IO_SYNC, "sync i/o (read/write)"},
{"async", LIO_IO_ASYNC, "async i/o (reada/writea/aio_read/aio_write)"},
{"slistio", LIO_IO_SLISTIO, "single stride sync listio"},
{"alistio", LIO_IO_ALISTIO, "single stride async listio"},
{"syncv", LIO_IO_SYNCV, "single buffer sync readv/writev"},
{"syncp", LIO_IO_SYNCP, "pread/pwrite"},
{"active", LIO_WAIT_ACTIVE, "spin on status/control values"},
{"recall", LIO_WAIT_RECALL,
"use recall(2)/aio_suspend(3) to wait for i/o to complete"},
{"sigactive", LIO_WAIT_SIGACTIVE, "spin waiting for signal"},
{"sigpause", LIO_WAIT_SIGPAUSE, "call pause(2) to wait for signal"},
/* nowait is a touchy thing, it's an accident that this implementation worked at all. 6/27/97 roehrich */
/* { "nowait", LIO_WAIT_NONE, "do not wait for async io to complete" },*/
{"random", LIO_RANDOM, "set random bit"},
{"randomall",
LIO_RANDOM | LIO_IO_TYPES | LIO_WAIT_TYPES,
"all random i/o types and wait methods (except nowait)"},
};
char Lio_SysCall[PATH_MAX]; /* string containing last i/o system call */
static volatile int Received_signal = 0; /* number of signals received */
static volatile int Rec_signal;
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
static volatile int Received_callback = 0; /* number of callbacks received */
static volatile int Rec_callback;
#endif
static char Errormsg[500];
static int Debug_level = 0;
/***********************************************************************
* stride_bounds()
*
* Determine the bounds of a strided request, normalized to offset. Returns
* the number of bytes needed to satisfy the request, and optionally sets
* *min and *max to the mininum and maximum bytes referenced, normalized
* around offset.
*
* Returns -1 on error - the only possible error conditions are illegal values
* for nstrides and/or bytes_per_stride - both parameters must be >= 0.
*
* (maule, 11/16/95)
***********************************************************************/
int stride_bounds(int offset, int stride, int nstrides, int bytes_per_stride,
int *min, int *max)
{
int nbytes, min_byte, max_byte;
/*
* sanity checks ...
*/
if (nstrides < 0 || bytes_per_stride < 0) {
return -1;
}
if (stride == 0) {
stride = bytes_per_stride;
}
/*
* Determine the # of bytes needed to satisfy the request. This
* value, along with the offset argument, determines the min and max
* bytes referenced.
*/
nbytes = abs(stride) * (nstrides - 1) + bytes_per_stride;
if (stride < 0) {
max_byte = offset + bytes_per_stride - 1;
min_byte = max_byte - nbytes + 1;
} else {
min_byte = offset;
max_byte = min_byte + nbytes - 1;
}
if (min != NULL) {
*min = min_byte;
}
if (max != NULL) {
*max = max_byte;
}
return nbytes;
}
/***********************************************************************
* This function will allow someone to set the debug level.
***********************************************************************/
int lio_set_debug(int level)
{
int old;
old = Debug_level;
Debug_level = level;
return old;
}
/***********************************************************************
* This function will parse a string and return desired io-method.
* Only the first character of the string is used.
*
* This function does not provide for meaningful option arguments,
* but it supports current growfiles/btlk interface.
*
* (rrl 04/96)
***********************************************************************/
int lio_parse_io_arg1(char *string)
{
unsigned int ind;
int found = 0;
int mask = 0;
/*
* Determine if token is a valid string.
*/
for (ind = 0; ind < sizeof(Lio_info1) / sizeof(struct lio_info_type);
ind++) {
if (strcmp(string, Lio_info1[ind].token) == 0) {
mask |= Lio_info1[ind].bits;
found = 1;
break;
}
}
if (found == 0) {
return -1;
}
return mask;
}
/***********************************************************************
* This function will print a help message describing the characters
* that can be parsed by lio_parse_io_arg1().
* They will be printed one per line.
* (rrl 04/96)
***********************************************************************/
void lio_help1(char *prefix)
{
unsigned int ind;
for (ind = 0; ind < sizeof(Lio_info1) / sizeof(struct lio_info_type);
ind++) {
printf("%s %s : %s\n", prefix, Lio_info1[ind].token,
Lio_info1[ind].desc);
}
return;
}
/***********************************************************************
* This function will parse a string and return the desired io-method.
* This function will take a comma separated list of io type and wait
* method tokens as defined in Lio_info2[]. If a token does not match
* any of the tokens in Lio_info2[], it will be coverted to a number.
* If it was a number, those bits are also set.
*
* (rrl 04/96)
***********************************************************************/
int lio_parse_io_arg2(char *string, char **badtoken)
{
char *token = string;
char *cc = token;
char savecc;
int found;
int mask = 0;
int tmp;
unsigned int ind;
char chr;
if (token == NULL)
return -1;
for (;;) {
for (; ((*cc != ',') && (*cc != '\0')); cc++) ;
savecc = *cc;
*cc = '\0';
found = 0;
/*
* Determine if token is a valid string or number and if
* so, add the bits to the mask.
*/
for (ind = 0;
ind < sizeof(Lio_info2) / sizeof(struct lio_info_type);
ind++) {
if (strcmp(token, Lio_info2[ind].token) == 0) {
mask |= Lio_info2[ind].bits;
found = 1;
break;
}
}
/*
* If token does not match one of the defined tokens, determine
* if it is a number, if so, add the bits.
*/
if (!found) {
if (sscanf(token, "%i%c", &tmp, &chr) == 1) {
mask |= tmp;
found = 1;
}
}
*cc = savecc;
if (!found) { /* token is not valid */
if (badtoken != NULL)
*badtoken = token;
return (-1);
}
if (savecc == '\0')
break;
token = ++cc;
}
return mask;
}
/***********************************************************************
* This function will print a help message describing the tokens
* that can be parsed by lio_parse_io_arg2().
* It will print them one per line.
*
* (rrl 04/96)
***********************************************************************/
void lio_help2(char *prefix)
{
unsigned int ind;
for (ind = 0; ind < sizeof(Lio_info2) / sizeof(struct lio_info_type);
ind++) {
printf("%s %s : %s\n", prefix, Lio_info2[ind].token,
Lio_info2[ind].desc);
}
return;
}
/***********************************************************************
* This is an internal signal handler.
* If the handler is called, it will increment the Received_signal
* global variable.
***********************************************************************/
static void lio_async_signal_handler(int sig)
{
if (Debug_level)
printf
("DEBUG %s/%d: received signal %d, a signal caught %d times\n",
__FILE__, __LINE__, sig, Received_signal + 1);
Received_signal++;
return;
}
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
/***********************************************************************
* This is an internal callback handler.
* If the handler is called, it will increment the Received_callback
* global variable.
***********************************************************************/
static void lio_async_callback_handler(union sigval sigval)
{
if (Debug_level)
printf
("DEBUG %s/%d: received callback, nbytes=%ld, a callback called %d times\n",
__FILE__, __LINE__, (long)sigval.sival_int,
Received_callback + 1);
Received_callback++;
return;
}
#endif /* sgi */
/***********************************************************************
* lio_random_methods
* This function will randomly choose an io type and wait method
* from set of io types and wait methods. Since this information
* is stored in a bitmask, it randomly chooses an io type from
* the io type bits specified and does the same for wait methods.
*
* Return Value
* This function will return a value with all non choosen io type
* and wait method bits cleared. The LIO_RANDOM bit is also
* cleared. All other bits are left unchanged.
*
* (rrl 04/96)
***********************************************************************/
int lio_random_methods(long curr_mask)
{
int mask = 0;
/* remove random select, io type, and wait method bits from curr_mask */
mask = curr_mask & (~(LIO_IO_TYPES | LIO_WAIT_TYPES | LIO_RANDOM));
/* randomly select io type from specified io types */
mask = mask | random_bit(curr_mask & LIO_IO_TYPES);
/* randomly select wait methods from specified wait methods */
mask = mask | random_bit(curr_mask & LIO_WAIT_TYPES);
return mask;
}
static void wait4sync_io(int fd, int read)
{
fd_set s;
FD_ZERO(&s);
FD_SET(fd, &s);
select(fd + 1, read ? &s : NULL, read ? NULL : &s, NULL, NULL);
}
/***********************************************************************
* Generic write function
* This function can be used to do a write using write(2), writea(2),
* aio_write(3), writev(2), pwrite(2),
* or single stride listio(2)/lio_listio(3).
* By setting the desired bits in the method
* bitmask, the caller can control the type of write and the wait method
* that will be used. If no io type bits are set, write will be used.
*
* If async io was attempted and no wait method bits are set then the
* wait method is: recall(2) for writea(2) and listio(2); aio_suspend(3) for
* aio_write(3) and lio_listio(3).
*
* If multiple wait methods are specified,
* only one wait method will be used. The order is predetermined.
*
* If the call specifies a signal and one of the two signal wait methods,
* a signal handler for the signal is set. This will reset an already
* set handler for this signal.
*
* If the LIO_RANDOM method bit is set, this function will randomly
* choose a io type and wait method from bits in the method argument.
*
* If an error is encountered, an error message will be generated
* in a internal static buffer. If errmsg is not NULL, it will
* be updated to point to the static buffer, allowing the caller
* to print the error message.
*
* Return Value
* If a system call fails, -errno is returned.
* If LIO_WAIT_NONE bit is set, the return value is the return value
* of the system call.
* If the io did not fail, the amount of data written is returned.
* If the size the system call say was written is different
* then what was asked to be written, errmsg is updated for
* this error condition. The return value is still the amount
* the system call says was written.
*
* (rrl 04/96)
***********************************************************************/
int lio_write_buffer(int fd, /* open file descriptor */
int method, /* contains io type and wait method bitmask */
char *buffer, /* pointer to buffer */
int size, /* the size of the io */
int sig, /* signal to use if async io */
char **errmsg, /* char pointer that will be updated to point to err message */
long wrd) /* to allow future features, use zero for now */
{
int ret = 0; /* syscall return or used to get random method */
char *io_type; /* Holds string of type of io */
int omethod = method;
int listio_cmd; /* Holds the listio/lio_listio cmd */
#ifdef CRAY
struct listreq request; /* Used when a listio is wanted */
struct iosw status, *statptr[1];
#else
/* for linux or sgi */
struct iovec iov; /* iovec for writev(2) */
#endif
#if defined (sgi)
aiocb_t aiocbp; /* POSIX aio control block */
aiocb_t *aiolist[1]; /* list of aio control blocks for lio_listio */
off64_t poffset; /* pwrite(2) offset */
#endif
#if defined(__linux__) && !defined(__UCLIBC__)
struct aiocb aiocbp; /* POSIX aio control block */
struct aiocb *aiolist[1]; /* list of aio control blocks for lio_listio */
off64_t poffset; /* pwrite(2) offset */
#endif
/*
* If LIO_RANDOM bit specified, get new method randomly.
*/
if (method & LIO_RANDOM) {
if (Debug_level > 3)
printf("DEBUG %s/%d: method mask to choose from: %#o\n",
__FILE__, __LINE__, method);
method = lio_random_methods(method);
if (Debug_level > 2)
printf("DEBUG %s/%d: random chosen method %#o\n",
__FILE__, __LINE__, method);
}
if (errmsg != NULL)
*errmsg = Errormsg;
Rec_signal = Received_signal; /* get the current number of signals received */
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
Rec_callback = Received_callback; /* get the current number of callbacks received */
#endif
#ifdef CRAY
memset(&status, 0x00, sizeof(struct iosw));
memset(&request, 0x00, sizeof(struct listreq));
statptr[0] = &status;
#else
/* for linux or sgi */
memset(&iov, 0x00, sizeof(struct iovec));
iov.iov_base = buffer;
iov.iov_len = size;
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
#if defined(sgi)
memset(&aiocbp, 0x00, sizeof(aiocb_t));
#else
memset(&aiocbp, 0x00, sizeof(struct aiocb));
#endif
aiocbp.aio_fildes = fd;
aiocbp.aio_nbytes = size;
aiocbp.aio_buf = buffer;
/* aiocbp.aio_offset = lseek( fd, 0, SEEK_CUR ); -- set below */
aiocbp.aio_sigevent.sigev_notify = SIGEV_NONE;
aiocbp.aio_sigevent.sigev_signo = 0;
#ifdef sgi
aiocbp.aio_sigevent.sigev_func = NULL;
aiocbp.aio_sigevent.sigev_value.sival_int = 0;
#elif defined(__linux__) && !defined(__UCLIBC__)
aiocbp.aio_sigevent.sigev_notify_function = NULL;
aiocbp.aio_sigevent.sigev_notify_attributes = 0;
#endif
aiolist[0] = &aiocbp;
if ((ret = lseek(fd, 0, SEEK_CUR)) == -1) {
ret = 0;
/* If there is an error and it is not ESPIPE then kick out the error.
* If the fd is a fifo then we have to make sure that
* lio_random_methods() didn't select pwrite/pread; if it did then
* switch to write/read.
*/
if (errno == ESPIPE) {
if (method & LIO_IO_SYNCP) {
if (omethod & LIO_RANDOM) {
method &= ~LIO_IO_SYNCP;
method |= LIO_IO_SYNC;
if (Debug_level > 2)
printf
("DEBUG %s/%d: random chosen method switched to %#o for fifo\n",
__FILE__, __LINE__,
method);
} else if (Debug_level) {
printf
("DEBUG %s/%d: pwrite will fail when it writes to a fifo\n",
__FILE__, __LINE__);
}
}
/* else: let it ride */
} else {
sprintf(Errormsg,
"%s/%d lseek(fd=%d,0,SEEK_CUR) failed, errno=%d %s",
__FILE__, __LINE__, fd, errno, strerror(errno));
return -errno;
}
}
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
poffset = (off64_t) ret;
#endif
aiocbp.aio_offset = ret;
#endif
/*
* If the LIO_USE_SIGNAL bit is not set, only use the signal
* if the LIO_WAIT_SIGPAUSE or the LIO_WAIT_SIGACTIVE bits are bit.
* Otherwise there is not necessary a signal handler to trap
* the signal.
*/
if (sig && !(method & LIO_USE_SIGNAL) && !(method & LIO_WAIT_SIGTYPES)) {
sig = 0; /* ignore signal parameter */
}
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
if (sig && (method & LIO_WAIT_CBTYPES))
sig = 0; /* ignore signal parameter */
#endif
/*
* only setup signal hander if sig was specified and
* a sig wait method was specified.
* Doing this will change the handler for this signal. The
* old signal handler will not be restored.
*** restoring the signal handler could be added ***
*/
if (sig && (method & LIO_WAIT_SIGTYPES)) {
#ifdef CRAY
sigctl(SCTL_REG, sig, lio_async_signal_handler);
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
aiocbp.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
aiocbp.aio_sigevent.sigev_signo = sig;
sigset(sig, lio_async_signal_handler);
#endif /* sgi */
}
#if defined(sgi)
else if (method & LIO_WAIT_CBTYPES) {
/* sival_int just has to be something that I can use
* to identify the callback, and "size" happens to be handy...
*/
aiocbp.aio_sigevent.sigev_notify = SIGEV_CALLBACK;
aiocbp.aio_sigevent.sigev_func = lio_async_callback_handler;
aiocbp.aio_sigevent.sigev_value.sival_int = size;
}
#endif
#if defined(__linux__) && !defined(__UCLIBC__)
else if (method & LIO_WAIT_CBTYPES) {
/* sival_int just has to be something that I can use
* to identify the callback, and "size" happens to be handy...
*/
aiocbp.aio_sigevent.sigev_notify = SIGEV_THREAD;
aiocbp.aio_sigevent.sigev_notify_function =
lio_async_callback_handler;
aiocbp.aio_sigevent.sigev_notify_attributes =
(void *)(uintptr_t) size;
}
#endif
/*
* Determine the system call that will be called and produce
* the string of the system call and place it in Lio_SysCall.
* Also update the io_type char pointer to give brief description
* of system call. Execute the system call and check for
* system call failure. If sync i/o, return the number of
* bytes written/read.
*/
if ((method & LIO_IO_SYNC)
|| (method & (LIO_IO_TYPES | LIO_IO_ATYPES)) == 0) {
/*
* write(2) is used if LIO_IO_SYNC bit is set or not none
* of the LIO_IO_TYPES bits are set (default).
*/
sprintf(Lio_SysCall, "write(%d, buf, %d)", fd, size);
io_type = "write";
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
while (1) {
if (((ret = write(fd, buffer, size)) == -1)
&& errno != EAGAIN && errno != EINTR) {
sprintf(Errormsg,
"%s/%d write(%d, buf, %d) ret:-1, errno=%d %s",
__FILE__, __LINE__, fd, size, errno,
strerror(errno));
return -errno;
}
if (ret != -1) {
if (ret != size) {
sprintf(Errormsg,
"%s/%d write(%d, buf, %d) returned=%d",
__FILE__, __LINE__,
fd, size, ret);
size -= ret;
buffer += ret;
} else {
if (Debug_level > 1)
printf
("DEBUG %s/%d: write completed without error (ret %d)\n",
__FILE__, __LINE__, ret);
return ret;
}
}
wait4sync_io(fd, 0);
}
}
else if (method & LIO_IO_ASYNC) {
#ifdef CRAY
sprintf(Lio_SysCall,
"writea(%d, buf, %d, &status, %d)", fd, size, sig);
io_type = "writea";
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
sigoff();
if ((ret = writea(fd, buffer, size, &status, sig)) == -1) {
sprintf(Errormsg,
"%s/%d writea(%d, buf, %d, &stat, %d) ret:-1, errno=%d %s",
__FILE__, __LINE__,
fd, size, sig, errno, strerror(errno));
sigon();
return -errno;
}
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
sprintf(Lio_SysCall,
"aio_write(fildes=%d, buf, nbytes=%d, signo=%d)", fd,
size, sig);
io_type = "aio_write";
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if (sig)
sighold(sig);
if ((ret = aio_write(&aiocbp)) == -1) {
sprintf(Errormsg,
"%s/%d aio_write(fildes=%d, buf, nbytes=%d, signo=%d) ret:-1, errno=%d %s",
__FILE__, __LINE__,
fd, size, sig, errno, strerror(errno));
if (sig)
sigrelse(sig);
return -errno;
}
#endif
}
/* LIO_IO_ASYNC */
else if (method & LIO_IO_SLISTIO) {
#ifdef CRAY
request.li_opcode = LO_WRITE;
request.li_fildes = fd;
request.li_buf = buffer;
request.li_nbyte = size;
request.li_status = &status;
request.li_signo = sig;
request.li_nstride = 0;
request.li_filstride = 0;
request.li_memstride = 0;
listio_cmd = LC_WAIT;
io_type = "listio(2) sync write";
sprintf(Lio_SysCall,
"listio(LC_WAIT, &req, 1) LO_WRITE, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
sigoff();
if (listio(listio_cmd, &request, 1) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
sigon();
return -errno;
}
if (Debug_level > 1)
printf("DEBUG %s/%d: %s did not return -1\n",
__FILE__, __LINE__, Lio_SysCall);
ret = lio_check_asyncio(io_type, size, &status);
return ret;
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
aiocbp.aio_lio_opcode = LIO_WRITE;
listio_cmd = LIO_WAIT;
io_type = "lio_listio(3) sync write";
sprintf(Lio_SysCall,
"lio_listio(LIO_WAIT, aiolist, 1, NULL) LIO_WRITE, fd:%d, nbyte:%d, sig:%d",
fd, size, sig);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if (sig)
sighold(sig);
if (lio_listio(listio_cmd, aiolist, 1, NULL) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
if (sig)
sigrelse(sig);
return -errno;
}
if (Debug_level > 1)
printf("DEBUG %s/%d: %s did not return -1\n",
__FILE__, __LINE__, Lio_SysCall);
ret = lio_check_asyncio(io_type, size, &aiocbp, method);
return ret;
#endif
}
/* LIO_IO_SLISTIO */
else if (method & LIO_IO_ALISTIO) {
#ifdef CRAY
request.li_opcode = LO_WRITE;
request.li_fildes = fd;
request.li_buf = buffer;
request.li_nbyte = size;
request.li_status = &status;
request.li_signo = sig;
request.li_nstride = 0;
request.li_filstride = 0;
request.li_memstride = 0;
listio_cmd = LC_START;
io_type = "listio(2) async write";
sprintf(Lio_SysCall,
"listio(LC_START, &req, 1) LO_WRITE, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
sigoff();
if (listio(listio_cmd, &request, 1) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
sigon();
return -errno;
}
#endif
#if defined (sgi) || (defined(__linux__) && !defined(__UCLIBC__))
aiocbp.aio_lio_opcode = LIO_WRITE;
listio_cmd = LIO_NOWAIT;
io_type = "lio_listio(3) async write";
sprintf(Lio_SysCall,
"lio_listio(LIO_NOWAIT, aiolist, 1, NULL) LIO_WRITE, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if (sig)
sighold(sig);
if (lio_listio(listio_cmd, aiolist, 1, NULL) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
if (sig)
sigrelse(sig);
return -errno;
}
#endif
}
/* LIO_IO_ALISTIO */
#ifndef CRAY
else if (method & LIO_IO_SYNCV) {
io_type = "writev(2)";
sprintf(Lio_SysCall, "writev(%d, &iov, 1) nbyte:%d", fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if ((ret = writev(fd, &iov, 1)) == -1) {
sprintf(Errormsg,
"%s/%d writev(%d, iov, 1) nbyte:%d ret:-1, errno=%d %s",
__FILE__, __LINE__, fd, size, errno,
strerror(errno));
return -errno;
}
if (ret != size) {
sprintf(Errormsg,
"%s/%d writev(%d, iov, 1) nbyte:%d returned=%d",
__FILE__, __LINE__, fd, size, ret);
} else if (Debug_level > 1)
printf
("DEBUG %s/%d: writev completed without error (ret %d)\n",
__FILE__, __LINE__, ret);
return ret;
} /* LIO_IO_SYNCV */
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
else if (method & LIO_IO_SYNCP) {
io_type = "pwrite(2)";
sprintf(Lio_SysCall,
"pwrite(%d, buf, %d, %lld)", fd, size,
(long long)poffset);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if ((ret = pwrite(fd, buffer, size, poffset)) == -1) {
sprintf(Errormsg,
"%s/%d pwrite(%d, buf, %d, %lld) ret:-1, errno=%d %s",
__FILE__, __LINE__, fd, size,
(long long)poffset, errno, strerror(errno));
return -errno;
}
if (ret != size) {
sprintf(Errormsg,
"%s/%d pwrite(%d, buf, %d, %lld) returned=%d",
__FILE__, __LINE__,
fd, size, (long long)poffset, ret);
} else if (Debug_level > 1)
printf
("DEBUG %s/%d: pwrite completed without error (ret %d)\n",
__FILE__, __LINE__, ret);
return ret;
} /* LIO_IO_SYNCP */
#endif
else {
printf("DEBUG %s/%d: No I/O method chosen\n", __FILE__,
__LINE__);
return -1;
}
/*
* wait for async io to complete.
*/
#ifdef CRAY
ret = lio_wait4asyncio(method, fd, statptr);
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
ret = lio_wait4asyncio(method, fd, &aiocbp);
#endif
/*
* If there was an error waiting for async i/o to complete,
* return the error value (errno) to the caller.
* Note: Errormsg should already have been updated.
*/
if (ret < 0) {
return ret;
}
/*
* If i/o was not waited for (may not have been completed at this time),
* return the size that was requested.
*/
if (ret == 1)
return size;
/*
* check that async io was successful.
* Note: if the there was an system call failure, -errno
* was returned and Errormsg should already have been updated.
* If amount i/o was different than size, Errormsg should already
* have been updated but the actual i/o size if returned.
*/
#ifdef CRAY
ret = lio_check_asyncio(io_type, size, &status);
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
ret = lio_check_asyncio(io_type, size, &aiocbp, method);
#endif
return ret;
} /* end of lio_write_buffer */
/***********************************************************************
* Generic read function
* This function can be used to do a read using read(2), reada(2),
* aio_read(3), readv(2), pread(2),
* or single stride listio(2)/lio_listio(3).
* By setting the desired bits in the method
* bitmask, the caller can control the type of read and the wait method
* that will be used. If no io type bits are set, read will be used.
*
* If async io was attempted and no wait method bits are set then the
* wait method is: recall(2) for reada(2) and listio(2); aio_suspend(3) for
* aio_read(3) and lio_listio(3).
*
* If multiple wait methods are specified,
* only one wait method will be used. The order is predetermined.
*
* If the call specifies a signal and one of the two signal wait methods,
* a signal handler for the signal is set. This will reset an already
* set handler for this signal.
*
* If the LIO_RANDOM method bit is set, this function will randomly
* choose a io type and wait method from bits in the method argument.
*
* If an error is encountered, an error message will be generated
* in a internal static buffer. If errmsg is not NULL, it will
* be updated to point to the static buffer, allowing the caller
* to print the error message.
*
* Return Value
* If a system call fails, -errno is returned.
* If LIO_WAIT_NONE bit is set, the return value is the return value
* of the system call.
* If the io did not fail, the amount of data written is returned.
* If the size the system call say was written is different
* then what was asked to be written, errmsg is updated for
* this error condition. The return value is still the amount
* the system call says was written.
*
* (rrl 04/96)
***********************************************************************/
int lio_read_buffer(int fd, /* open file descriptor */
int method, /* contains io type and wait method bitmask*/
char *buffer, /* pointer to buffer */
int size, /* the size of the io */
int sig, /* signal to use if async io */
char **errmsg, /* char pointer that will be updated to point to err message */
long wrd) /* to allow future features, use zero for now */
{
int ret = 0; /* syscall return or used to get random method */
char *io_type; /* Holds string of type of io */
int listio_cmd; /* Holds the listio/lio_listio cmd */
int omethod = method;
#ifdef CRAY
struct listreq request; /* Used when a listio is wanted */
struct iosw status, *statptr[1];
#else
/* for linux or sgi */
struct iovec iov; /* iovec for readv(2) */
#endif
#ifdef sgi
aiocb_t aiocbp; /* POSIX aio control block */
aiocb_t *aiolist[1]; /* list of aio control blocks for lio_listio */
off64_t poffset; /* pread(2) offset */
#endif
#if defined (__linux__) && !defined(__UCLIBC__)
struct aiocb aiocbp; /* POSIX aio control block */
struct aiocb *aiolist[1]; /* list of aio control blocks for lio_listio */
off64_t poffset; /* pread(2) offset */
#endif
/*
* If LIO_RANDOM bit specified, get new method randomly.
*/
if (method & LIO_RANDOM) {
if (Debug_level > 3)
printf("DEBUG %s/%d: method mask to choose from: %#o\n",
__FILE__, __LINE__, method);
method = lio_random_methods(method);
if (Debug_level > 2)
printf("DEBUG %s/%d: random chosen method %#o\n",
__FILE__, __LINE__, method);
}
if (errmsg != NULL)
*errmsg = Errormsg;
Rec_signal = Received_signal; /* get the current number of signals received */
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
Rec_callback = Received_callback; /* get the current number of callbacks received */
#endif
#ifdef CRAY
memset(&status, 0x00, sizeof(struct iosw));
memset(&request, 0x00, sizeof(struct listreq));
statptr[0] = &status;
#else
/* for linux or sgi */
memset(&iov, 0x00, sizeof(struct iovec));
iov.iov_base = buffer;
iov.iov_len = size;
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
#if defined(sgi)
memset(&aiocbp, 0x00, sizeof(aiocb_t));
#else
memset(&aiocbp, 0x00, sizeof(struct aiocb));
#endif
aiocbp.aio_fildes = fd;
aiocbp.aio_nbytes = size;
aiocbp.aio_buf = buffer;
/* aiocbp.aio_offset = lseek( fd, 0, SEEK_CUR ); -- set below */
aiocbp.aio_sigevent.sigev_notify = SIGEV_NONE;
aiocbp.aio_sigevent.sigev_signo = 0;
#ifdef sgi
aiocbp.aio_sigevent.sigev_func = NULL;
aiocbp.aio_sigevent.sigev_value.sival_int = 0;
#elif defined(__linux__) && !defined(__UCLIBC__)
aiocbp.aio_sigevent.sigev_notify_function = NULL;
aiocbp.aio_sigevent.sigev_notify_attributes = 0;
#endif
aiolist[0] = &aiocbp;
if ((ret = lseek(fd, 0, SEEK_CUR)) == -1) {
ret = 0;
/* If there is an error and it is not ESPIPE then kick out the error.
* If the fd is a fifo then we have to make sure that
* lio_random_methods() didn't select pwrite/pread; if it did then
* switch to write/read.
*/
if (errno == ESPIPE) {
if (method & LIO_IO_SYNCP) {
if (omethod & LIO_RANDOM) {
method &= ~LIO_IO_SYNCP;
method |= LIO_IO_SYNC;
if (Debug_level > 2)
printf
("DEBUG %s/%d: random chosen method switched to %#o for fifo\n",
__FILE__, __LINE__,
method);
} else if (Debug_level) {
printf
("DEBUG %s/%d: pread will fail when it reads from a fifo\n",
__FILE__, __LINE__);
}
}
/* else: let it ride */
} else {
sprintf(Errormsg,
"%s/%d lseek(fd=%d,0,SEEK_CUR) failed, errno=%d %s",
__FILE__, __LINE__, fd, errno, strerror(errno));
return -errno;
}
}
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
poffset = (off64_t) ret;
#endif
aiocbp.aio_offset = ret;
#endif
/*
* If the LIO_USE_SIGNAL bit is not set, only use the signal
* if the LIO_WAIT_SIGPAUSE or the LIO_WAIT_SIGACTIVE bits are set.
* Otherwise there is not necessarily a signal handler to trap
* the signal.
*/
if (sig && !(method & LIO_USE_SIGNAL) && !(method & LIO_WAIT_SIGTYPES)) {
sig = 0; /* ignore signal parameter */
}
#if defined(sgi) || (defined(__linux__)&& !defined(__UCLIBC__))
if (sig && (method & LIO_WAIT_CBTYPES))
sig = 0; /* ignore signal parameter */
#endif
/*
* only setup signal hander if sig was specified and
* a sig wait method was specified.
* Doing this will change the handler for this signal. The
* old signal handler will not be restored.
*** restoring the signal handler could be added ***
*/
if (sig && (method & LIO_WAIT_SIGTYPES)) {
#ifdef CRAY
sigctl(SCTL_REG, sig, lio_async_signal_handler);
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
aiocbp.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
aiocbp.aio_sigevent.sigev_signo = sig;
sigset(sig, lio_async_signal_handler);
#endif /* CRAY */
}
#if defined(sgi)
else if (method & LIO_WAIT_CBTYPES) {
aiocbp.aio_sigevent.sigev_notify = SIGEV_CALLBACK;
aiocbp.aio_sigevent.sigev_func = lio_async_callback_handler;
/* sival_int just has to be something that I can use
* to identify the callback, and "size" happens to be handy...
*/
aiocbp.aio_sigevent.sigev_value.sival_int = size;
}
#endif
#if defined(__linux__) && !defined(__UCLIBC__)
else if (method & LIO_WAIT_CBTYPES) {
aiocbp.aio_sigevent.sigev_notify = SIGEV_THREAD;
aiocbp.aio_sigevent.sigev_notify_function =
lio_async_callback_handler;
/* sival_int just has to be something that I can use
* to identify the callback, and "size" happens to be handy...
*/
aiocbp.aio_sigevent.sigev_notify_attributes =
(void *)(uintptr_t) size;
}
#endif
/*
* Determine the system call that will be called and produce
* the string of the system call and place it in Lio_SysCall.
* Also update the io_type char pointer to give brief description
* of system call. Execute the system call and check for
* system call failure. If sync i/o, return the number of
* bytes written/read.
*/
if ((method & LIO_IO_SYNC)
|| (method & (LIO_IO_TYPES | LIO_IO_ATYPES)) == 0) {
/*
* read(2) is used if LIO_IO_SYNC bit is set or not none
* of the LIO_IO_TYPES bits are set (default).
*/
sprintf(Lio_SysCall, "read(%d, buf, %d)", fd, size);
io_type = "read";
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
while (1) {
if (((ret = read(fd, buffer, size)) == -1)
&& errno != EINTR && errno != EAGAIN) {
sprintf(Errormsg,
"%s/%d read(%d, buf, %d) ret:-1, errno=%d %s",
__FILE__, __LINE__, fd, size, errno,
strerror(errno));
return -errno;
}
if (ret == 0)
return 0;
if (ret != -1) {
if (ret != size) {
sprintf(Errormsg,
"%s/%d read(%d, buf, %d) returned=%d",
__FILE__, __LINE__,
fd, size, ret);
size -= ret;
buffer += ret;
} else {
if (Debug_level > 1)
printf
("DEBUG %s/%d: read completed without error (ret %d)\n",
__FILE__, __LINE__, ret);
return ret;
}
}
wait4sync_io(fd, 1);
}
}
else if (method & LIO_IO_ASYNC) {
#ifdef CRAY
sprintf(Lio_SysCall,
"reada(%d, buf, %d, &status, %d)", fd, size, sig);
io_type = "reada";
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
sigoff();
if ((ret = reada(fd, buffer, size, &status, sig)) == -1) {
sprintf(Errormsg,
"%s/%d reada(%d, buf, %d, &stat, %d) ret:-1, errno=%d %s",
__FILE__, __LINE__,
fd, size, sig, errno, strerror(errno));
sigon();
return -errno;
}
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
sprintf(Lio_SysCall,
"aio_read(fildes=%d, buf, nbytes=%d, signo=%d)", fd,
size, sig);
io_type = "aio_read";
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if (sig)
sighold(sig);
if ((ret = aio_read(&aiocbp)) == -1) {
sprintf(Errormsg,
"%s/%d aio_read(fildes=%d, buf, nbytes=%d, signo=%d) ret:-1, errno=%d %s",
__FILE__, __LINE__,
fd, size, sig, errno, strerror(errno));
if (sig)
sigrelse(sig);
return -errno;
}
#endif
}
/* LIO_IO_ASYNC */
else if (method & LIO_IO_SLISTIO) {
#ifdef CRAY
request.li_opcode = LO_READ;
request.li_fildes = fd;
request.li_buf = buffer;
request.li_nbyte = size;
request.li_status = &status;
request.li_signo = sig;
request.li_nstride = 0;
request.li_filstride = 0;
request.li_memstride = 0;
listio_cmd = LC_WAIT;
io_type = "listio(2) sync read";
sprintf(Lio_SysCall,
"listio(LC_WAIT, &req, 1) LO_READ, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
sigoff();
if (listio(listio_cmd, &request, 1) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
sigon();
return -errno;
}
if (Debug_level > 1)
printf("DEBUG %s/%d: %s did not return -1\n",
__FILE__, __LINE__, Lio_SysCall);
ret = lio_check_asyncio(io_type, size, &status);
return ret;
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
aiocbp.aio_lio_opcode = LIO_READ;
listio_cmd = LIO_WAIT;
io_type = "lio_listio(3) sync read";
sprintf(Lio_SysCall,
"lio_listio(LIO_WAIT, aiolist, 1, NULL) LIO_READ, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if (sig)
sighold(sig);
if (lio_listio(listio_cmd, aiolist, 1, NULL) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
if (sig)
sigrelse(sig);
return -errno;
}
if (Debug_level > 1)
printf("DEBUG %s/%d: %s did not return -1\n",
__FILE__, __LINE__, Lio_SysCall);
ret = lio_check_asyncio(io_type, size, &aiocbp, method);
return ret;
#endif
}
/* LIO_IO_SLISTIO */
else if (method & LIO_IO_ALISTIO) {
#ifdef CRAY
request.li_opcode = LO_READ;
request.li_fildes = fd;
request.li_buf = buffer;
request.li_nbyte = size;
request.li_status = &status;
request.li_signo = sig;
request.li_nstride = 0;
request.li_filstride = 0;
request.li_memstride = 0;
listio_cmd = LC_START;
io_type = "listio(2) async read";
sprintf(Lio_SysCall,
"listio(LC_START, &req, 1) LO_READ, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
sigoff();
if (listio(listio_cmd, &request, 1) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
sigon();
return -errno;
}
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
aiocbp.aio_lio_opcode = LIO_READ;
listio_cmd = LIO_NOWAIT;
io_type = "lio_listio(3) async read";
sprintf(Lio_SysCall,
"lio_listio(LIO_NOWAIT, aiolist, 1, NULL) LIO_READ, fd:%d, nbyte:%d",
fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if (sig)
sighold(sig);
if (lio_listio(listio_cmd, aiolist, 1, NULL) == -1) {
sprintf(Errormsg,
"%s/%d %s failed, fd:%d, nbyte:%d errno=%d %s",
__FILE__, __LINE__, Lio_SysCall, fd, size,
errno, strerror(errno));
if (sig)
sigrelse(sig);
return -errno;
}
#endif
}
/* LIO_IO_ALISTIO */
#ifndef CRAY
else if (method & LIO_IO_SYNCV) {
io_type = "readv(2)";
sprintf(Lio_SysCall, "readv(%d, &iov, 1) nbyte:%d", fd, size);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if ((ret = readv(fd, &iov, 1)) == -1) {
sprintf(Errormsg,
"%s/%d readv(%d, iov, 1) nbyte:%d ret:-1, errno=%d %s",
__FILE__, __LINE__, fd, size, errno,
strerror(errno));
return -errno;
}
if (ret != size) {
sprintf(Errormsg,
"%s/%d readv(%d, iov, 1) nbyte:%d returned=%d",
__FILE__, __LINE__, fd, size, ret);
} else if (Debug_level > 1)
printf
("DEBUG %s/%d: readv completed without error (ret %d)\n",
__FILE__, __LINE__, ret);
return ret;
} /* LIO_IO_SYNCV */
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
else if (method & LIO_IO_SYNCP) {
io_type = "pread(2)";
sprintf(Lio_SysCall,
"pread(%d, buf, %d, %lld)", fd, size,
(long long)poffset);
if (Debug_level) {
printf("DEBUG %s/%d: %s\n", __FILE__, __LINE__,
Lio_SysCall);
}
if ((ret = pread(fd, buffer, size, poffset)) == -1) {
sprintf(Errormsg,
"%s/%d pread(%d, buf, %d, %lld) ret:-1, errno=%d %s",
__FILE__, __LINE__, fd, size,
(long long)poffset, errno, strerror(errno));
return -errno;
}
if (ret != size) {
sprintf(Errormsg,
"%s/%d pread(%d, buf, %d, %lld) returned=%d",
__FILE__, __LINE__,
fd, size, (long long)poffset, ret);
} else if (Debug_level > 1)
printf
("DEBUG %s/%d: pread completed without error (ret %d)\n",
__FILE__, __LINE__, ret);
return ret;
} /* LIO_IO_SYNCP */
#endif
else {
printf("DEBUG %s/%d: No I/O method chosen\n", __FILE__,
__LINE__);
return -1;
}
/*
* wait for async io to complete.
* Note: Sync io should have returned prior to getting here.
*/
#ifdef CRAY
ret = lio_wait4asyncio(method, fd, statptr);
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
ret = lio_wait4asyncio(method, fd, &aiocbp);
#endif
/*
* If there was an error waiting for async i/o to complete,
* return the error value (errno) to the caller.
* Note: Errormsg should already have been updated.
*/
if (ret < 0) {
return ret;
}
/*
* If i/o was not waited for (may not have been completed at this time),
* return the size that was requested.
*/
if (ret == 1)
return size;
/*
* check that async io was successful.
* Note: if the there was an system call failure, -errno
* was returned and Errormsg should already have been updated.
* If amount i/o was different than size, Errormsg should already
* have been updated but the actual i/o size if returned.
*/
#ifdef CRAY
ret = lio_check_asyncio(io_type, size, &status);
#endif
#if defined(sgi) || (defined(__linux__) && !defined(__UCLIBC__))
ret = lio_check_asyncio(io_type, size, &aiocbp, method);
#endif
return ret;
} /* end of lio_read_buffer */
#if !defined(__sun) && !defined(__hpux) && !defined(_AIX)
/***********************************************************************
* This function will check that async io was successful.
* It can also be used to check sync listio since it uses the
* same method.
*
* Return Values
* If status.sw_error is set, -status.sw_error is returned.
* Otherwise sw_count's field value is returned.
*
* (rrl 04/96)
***********************************************************************/
#ifdef CRAY
int lio_check_asyncio(char *io_type, int size, struct iosw *status)
#elif defined(sgi)
int lio_check_asyncio(char *io_type, int size, aiocb_t * aiocbp, int method)
#elif defined(__linux__) && !defined(__UCLIBC__)
int lio_check_asyncio(char *io_type, int size, struct aiocb *aiocbp, int method)
{
int ret;
#ifdef CRAY
if (status->sw_error) {
sprintf(Errormsg,
"%s/%d %s, sw_error set = %d %s, sw_count = %d",
__FILE__, __LINE__, io_type,
status->sw_error, strerror(status->sw_error),
status->sw_count);
return -status->sw_error;
} else if (status->sw_count != size) {
sprintf(Errormsg,
"%s/%d %s, sw_count not as expected(%d), but actual:%d",
__FILE__, __LINE__, io_type, size, status->sw_count);
} else if (Debug_level > 1) {
printf
("DEBUG %s/%d: %s completed without error (sw_error == 0, sw_count == %d)\n",
__FILE__, __LINE__, io_type, status->sw_count);
}
return status->sw_count;
#else
int cnt = 1;
/* The I/O may have been synchronous with signal completion. It doesn't
* make sense, but the combination could be generated. Release the
* completion signal here otherwise it'll hang around and bite us
* later.
*/
if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
sigrelse(aiocbp->aio_sigevent.sigev_signo);
ret = aio_error(aiocbp);
while (ret == EINPROGRESS) {
ret = aio_error(aiocbp);
++cnt;
}
if (cnt > 1) {
sprintf(Errormsg,
"%s/%d %s, aio_error had to loop on EINPROGRESS, cnt=%d; random method %#o; sigev_notify=%s",
__FILE__, __LINE__, io_type, cnt, method,
(aiocbp->aio_sigevent.sigev_notify ==
SIGEV_SIGNAL ? "signal" : aiocbp->aio_sigevent.
sigev_notify == SIGEV_NONE ? "none" :
#ifdef SIGEV_CALLBACK
aiocbp->aio_sigevent.sigev_notify ==
SIGEV_CALLBACK ? "callback" :
#endif
aiocbp->aio_sigevent.sigev_notify ==
SIGEV_THREAD ? "thread" : "unknown"));
return -ret;
}
if (ret != 0) {
sprintf(Errormsg,
"%s/%d %s, aio_error = %d %s; random method %#o",
__FILE__, __LINE__, io_type,
ret, strerror(ret), method);
return -ret;
}
ret = aio_return(aiocbp);
if (ret != size) {
sprintf(Errormsg,
"%s/%d %s, aio_return not as expected(%d), but actual:%d",
__FILE__, __LINE__, io_type, size, ret);
#ifdef BUG1_workaround
if (ret == 0) {
ret = size;
if (Debug_level > 1) {
printf
("WARN %s/%d: %s completed with bug1_workaround (aio_error == 0, aio_return now == %d)\n",
__FILE__, __LINE__, io_type, ret);
}
}
#endif /* BUG1_workaround */
} else if (Debug_level > 1) {
printf
("DEBUG %s/%d: %s completed without error (aio_error == 0, aio_return == %d)\n",
__FILE__, __LINE__, io_type, ret);
}
return ret;
#endif
} /* end of lio_check_asyncio */
#endif
/***********************************************************************
*
* This function will wait for async io to complete.
* If multiple wait methods are specified, the order is predetermined
* to LIO_WAIT_RECALL,
* LIO_WAIT_ACTIVE, LIO_WAIT_SIGPAUSE, LIO_WAIT_SIGACTIVE,
* then LIO_WAIT_NONE.
*
* If no wait method was specified the default wait method is: recall(2)
* or aio_suspend(3), as appropriate.
*
* Return Values
* <0: errno of failed recall
* 0 : async io was completed
* 1 : async was not waited for, io may not have completed.
*
* (rrl 04/96)
***********************************************************************/
#ifdef CRAY
int lio_wait4asyncio(int method, int fd, struct iosw **statptr)
#elif defined(sgi)
int lio_wait4asyncio(int method, int fd, aiocb_t * aiocbp)
#elif defined(__linux__) && !defined(__UCLIBC__)
int lio_wait4asyncio(int method, int fd, struct aiocb *aiocbp)
{
int cnt;
#ifdef sgi
int ret;
const aiocb_t *aioary[1];
#endif
#if defined(__linux__)&& !defined(__UCLIBC__)
int ret;
const struct aiocb *aioary[1];
#endif
if ((method & LIO_WAIT_RECALL)
#if defined(sgi) || (defined(__linux__)&& !defined(__UCLIBC__))
|| (method & LIO_WAIT_CBSUSPEND)
|| (method & LIO_WAIT_SIGSUSPEND)
#endif
|| ((method & LIO_WAIT_TYPES) == 0)) {
/*
* If method has LIO_WAIT_RECALL bit set or method does
* not have any wait method bits set (default), use recall/aio_suspend.
*/
#ifdef CRAY
if (Debug_level > 2)
printf("DEBUG %s/%d: wait method : recall\n", __FILE__,
__LINE__);
sigon();
if (recall(fd, 1, statptr)) {
sprintf(Errormsg,
"%s/%d recall(%d, 1, stat) failed, errno:%d %s",
__FILE__, __LINE__, fd, errno, strerror(errno));
return -errno;
}
#else
if (Debug_level > 2)
printf
("DEBUG %s/%d: wait method : aio_suspend, sigev_notify=%s\n",
__FILE__, __LINE__,
(aiocbp->aio_sigevent.sigev_notify ==
SIGEV_SIGNAL ? "signal" : aiocbp->aio_sigevent.
sigev_notify == SIGEV_NONE ? "none" :
#ifdef SIGEV_CALLBACK
aiocbp->aio_sigevent.sigev_notify ==
SIGEV_CALLBACK ? "callback" :
#endif
aiocbp->aio_sigevent.sigev_notify ==
SIGEV_THREAD ? "thread" : "unknown"));
aioary[0] = aiocbp;
ret = aio_suspend(aioary, 1, NULL);
if ((ret == -1) && (errno == EINTR)) {
if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
if (Debug_level > 2) {
printf
("DEBUG %s/%d: aio_suspend received EINTR, sigev_notify=SIGEV_SIGNAL -- ok\n",
__FILE__, __LINE__);
}
} else {
sprintf(Errormsg,
"%s/%d aio_suspend received EINTR, sigev_notify=%s, not ok\n",
__FILE__, __LINE__,
(aiocbp->aio_sigevent.sigev_notify ==
SIGEV_SIGNAL ? "signal" : aiocbp->
aio_sigevent.sigev_notify ==
SIGEV_NONE ? "none" :
#ifdef SIGEV_CALLBACK
aiocbp->aio_sigevent.sigev_notify ==
SIGEV_CALLBACK ? "callback" :
#endif
aiocbp->aio_sigevent.sigev_notify ==
SIGEV_THREAD ? "thread" : "unknown"));
return -errno;
}
} else if (ret) {
sprintf(Errormsg,
"%s/%d aio_suspend(fildes=%d, aioary, 1, NULL) failed, errno:%d %s",
__FILE__, __LINE__, fd, errno, strerror(errno));
return -errno;
}
#endif
} else if (method & LIO_WAIT_ACTIVE) {
if (Debug_level > 2)
printf("DEBUG %s/%d: wait method : active\n", __FILE__,
__LINE__);
#ifdef CRAY
sigon();
/*
* loop until sw_flag, sw_count or sw_error field elements
* change to non-zero.
*/
cnt = 0;
while ((*statptr)->sw_flag == 0 &&
(*statptr)->sw_count == 0 && (*statptr)->sw_error == 0) {
cnt++;
}
#else
/* loop while aio_error() returns EINPROGRESS */
cnt = 0;
while (1) {
ret = aio_error(aiocbp);
if ((ret == 0) || (ret != EINPROGRESS)) {
break;
}
++cnt;
}
#endif
if (Debug_level > 5 && cnt && (cnt % 50) == 0)
printf("DEBUG %s/%d: wait active cnt = %d\n",
__FILE__, __LINE__, cnt);
} else if (method & LIO_WAIT_SIGPAUSE) {
if (Debug_level > 2)
printf("DEBUG %s/%d: wait method : sigpause\n",
__FILE__, __LINE__);
#ifdef sgi
/* note: don't do the sigon() for CRAY in this case. why? -- roehrich 6/11/97 */
if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
sigrelse(aiocbp->aio_sigevent.sigev_signo);
else {
printf("DEBUG %s/%d: sigev_notify != SIGEV_SIGNAL\n",
__FILE__, __LINE__);
return -1;
}
#endif
pause();
} else if (method & LIO_WAIT_SIGACTIVE) {
if (Debug_level > 2)
printf("DEBUG %s/%d: wait method : sigactive\n",
__FILE__, __LINE__);
#ifdef CRAY
sigon();
#else
if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL)
sigrelse(aiocbp->aio_sigevent.sigev_signo);
else {
printf("DEBUG %s/%d: sigev_notify != SIGEV_SIGNAL\n",
__FILE__, __LINE__);
return -1;
}
#endif
/* loop waiting for signal */
while (Received_signal == Rec_signal) {
#ifdef CRAY
sigon();
#else
sigrelse(aiocbp->aio_sigevent.sigev_signo);
#endif
}
} else if (method & LIO_WAIT_NONE) {
if (Debug_level > 2)
printf("DEBUG %s/%d: wait method : none\n", __FILE__,
__LINE__);
/* It's broken because the aiocb/iosw is an automatic variable in
* lio_{read,write}_buffer, so when the function returns and the
* I/O completes there will be nowhere to write the I/O status.
* It doesn't cause a problem on unicos--probably because of some
* compiler quirk, or an accident. It causes POSIX async I/O
* to core dump some threads. spr/pv 705909. 6/27/97 roehrich
*/
sprintf(Errormsg,
"%s/%d LIO_WAIT_NONE was selected (this is broken)\n",
__FILE__, __LINE__);
#ifdef CRAY
sigon();
#endif
/* return 1;*/
return -1;
} else {
if (Debug_level > 2)
printf("DEBUG %s/%d: no wait method was chosen\n",
__FILE__, __LINE__);
return -1;
}
return 0;
} /* end of lio_wait4asyncio */
#endif /* ifndef linux */
#endif
#if UNIT_TEST
/***********************************************************************
* The following code is provided as unit test.
* Just define add "-DUNIT_TEST=1" to the cc line.
*
* (rrl 04/96)
***********************************************************************/
struct unit_info_t {
int method;
int sig;
char *str;
} Unit_info[] = {
{
LIO_IO_SYNC, 0, "sync io"}, {
LIO_IO_SYNCV, 0, "sync readv/writev"}, {
LIO_IO_SYNCP, 0, "sync pread/pwrite"}, {
LIO_IO_ASYNC, 0, "async io, def wait"}, {
LIO_IO_SLISTIO, 0, "sync listio"}, {
LIO_IO_ALISTIO, 0, "async listio, def wait"}, {
LIO_IO_ASYNC | LIO_WAIT_ACTIVE, 0, "async active"}, {
LIO_IO_ASYNC | LIO_WAIT_RECALL, 0, "async recall/suspend"}, {
LIO_IO_ASYNC | LIO_WAIT_SIGPAUSE, SIGUSR1, "async sigpause"}, {
LIO_IO_ASYNC | LIO_WAIT_SIGACTIVE, SIGUSR1, "async sigactive"}, {
LIO_IO_ALISTIO | LIO_WAIT_ACTIVE, 0, "async listio active"}, {
LIO_IO_ALISTIO | LIO_WAIT_RECALL, 0, "async listio recall"}, {
LIO_IO_ALISTIO | LIO_WAIT_SIGACTIVE, SIGUSR1, "async listio sigactive"},
{
LIO_IO_ALISTIO | LIO_WAIT_SIGPAUSE, SIGUSR1, "async listio sigpause"},
{
LIO_IO_ASYNC, SIGUSR2, "async io, def wait, sigusr2"}, {
LIO_IO_ALISTIO, SIGUSR2, "async listio, def wait, sigusr2"},};
int main(argc, argv)
int argc;
char **argv;
{
extern char *optarg;
extern int optind;
int fd;
char *err;
char buffer[4096];
int size = 4096;
int ret;
int ind;
int iter = 3;
int method;
int exit_status = 0;
int c;
int i;
char *symbols = NULL;
int die_on_err = 0;
while ((c = getopt(argc, argv, "s:di:")) != -1) {
switch (c) {
case 's':
symbols = optarg;
break;
case 'd':
++die_on_err;
break;
case 'i':
iter = atoi(optarg);
break;
}
}
if ((fd =
open("unit_test_file", O_CREAT | O_RDWR | O_TRUNC, 0777)) == -1) {
perror
("open(unit_test_file, O_CREAT|O_RDWR|O_TRUNC, 0777) failed");
exit(1);
}
Debug_level = 9;
if (symbols != NULL) {
if ((method = lio_parse_io_arg2(symbols, &err)) == -1) {
printf
("lio_parse_io_arg2(%s, &err) failed, bad token starting at %s\n",
symbols, err);
if (die_on_err)
exit(1);
} else
printf("lio_parse_io_arg2(%s, &err) returned %#o\n",
symbols, method);
exit_status = 0;
for (ind = 0; ind < iter; ind++) {
memset(buffer, 'A', 4096);
if (lseek(fd, 0, 0) == -1) {
printf("lseek(fd,0,0), %d, failed, errno %d\n",
__LINE__, errno);
++exit_status;
}
if ((ret = lio_write_buffer(fd, method, buffer,
size, SIGUSR1, &err,
0)) != size) {
printf
("lio_write_buffer returned -1, err = %s\n",
err);
} else
printf("lio_write_buffer returned %d\n", ret);
memset(buffer, 'B', 4096);
if (lseek(fd, 0, 0) == -1) {
printf("lseek(fd,0,0), %d, failed, errno %d\n",
__LINE__, errno);
++exit_status;
}
if ((ret = lio_read_buffer(fd, method, buffer,
size, SIGUSR2, &err,
0)) != size) {
printf
("lio_read_buffer returned -1, err = %s\n",
err);
} else
printf("lio_read_buffer returned %d\n", ret);
for (i = 0; i < 4096; ++i) {
if (buffer[i] != 'A') {
printf(" buffer[%d] = %d\n", i,
buffer[i]);
++exit_status;
break;
}
}
if (exit_status)
exit(exit_status);
}
unlink("unit_test_file");
exit(0);
}
for (ind = 0; ind < sizeof(Unit_info) / sizeof(struct unit_info_t);
ind++) {
printf("\n********* write %s ***************\n",
Unit_info[ind].str);
if (lseek(fd, 0, 0) == -1) {
printf("lseek(fd,0,0), %d, failed, errno %d\n",
__LINE__, errno);
++exit_status;
}
memset(buffer, 'A', 4096);
if ((ret = lio_write_buffer(fd, Unit_info[ind].method, buffer,
size, Unit_info[ind].sig, &err,
0)) != size) {
printf
(">>>>> lio_write_buffer(fd,0%x,buffer,%d,%d,err,0) returned -1,\n err = %s\n",
Unit_info[ind].method, size, Unit_info[ind].sig,
err);
++exit_status;
if (die_on_err)
exit(exit_status);
} else {
printf("lio_write_buffer returned %d\n", ret);
}
printf("\n********* read %s ***************\n",
Unit_info[ind].str);
if (lseek(fd, 0, 0) == -1) {
printf("lseek(fd,0,0), %d, failed, errno %d\n",
__LINE__, errno);
++exit_status;
}
memset(buffer, 'B', 4096);
if ((ret = lio_read_buffer(fd, Unit_info[ind].method, buffer,
size, Unit_info[ind].sig, &err,
0)) != size) {
printf
(">>>>> lio_read_buffer(fd,0%x,buffer,%d,%d,err,0) returned -1,\n err = %s\n",
Unit_info[ind].method, size, Unit_info[ind].sig,
err);
++exit_status;
if (die_on_err)
exit(exit_status);
} else {
printf("lio_read_buffer returned %d\n", ret);
}
for (i = 0; i < 4096; ++i) {
if (buffer[i] != 'A') {
printf(" buffer[%d] = %d\n", i, buffer[i]);
++exit_status;
if (die_on_err)
exit(exit_status);
break;
}
}
fflush(stdout);
fflush(stderr);
sleep(1);
}
unlink("unit_test_file");
exit(exit_status);
}
#endif