/*
* 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/
*
*
* OS Test - Silicon Graphics, Inc.
* TEST IDENTIFIER : fork04
* TEST TITLE : Child inheritance of Environment Variables after fork()
* PARENT DOCUMENT : frktds01
* TEST CASE TOTAL : 3
* WALL CLOCK TIME : 1
* CPU TYPES : ALL
* AUTHOR : Kathy Olmsted
* CO-PILOT : Steve Shaw
* DATE STARTED : 06/17/92
* INITIAL RELEASE : UNICOS 7.0
*
* TEST CASES
* Test these environment variables correctly inherited by child:
* 1. TERM
* 2. NoTSetzWq
* 3. TESTPROG
*
* INPUT SPECIFICATIONS
* The standard options for system call tests are accepted.
* (See the parse_opts(3) man page).
*
* DURATION
* Terminates - with frequency and infinite modes.
*
* SIGNALS
* Uses SIGUSR1 to pause before test if option set.
* (See the parse_opts(3) man page).
*
* ENVIRONMENTAL NEEDS
* No run-time environmental needs.
*
* DETAILED DESCRIPTION
*
* Setup:
* Setup signal handling.
* Make and change to a temporary directory.
* Pause for SIGUSR1 if option specified.
* Add TESTPROG variable to the environment
*
* Test:
* Loop if the proper options are given.
* fork()
* Check return code, if system call failed (return=-1)
* Log the errno
* CHILD:
* open a temp file
* Determine environment values and write to file
* close file containing test values.
* exit.
* PARENT:
* Wait for child to exit.
* Verify exit status
* Open file containing test values.
* For each test case:
* Read the value from the file.
* Determine and report PASS/FAIL result.
*
* Cleanup:
* Print errno log and/or timing stats if options given
* Remove the temporary directory and exit.
*/
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/param.h>
#include <signal.h>
#include <errno.h>
#include "test.h"
#include "safe_macros.h"
char *TCID = "fork04";
#define KIDEXIT 42
#define MAX_LINE_LENGTH 256
#define OUTPUT_FILE "env.out"
#define ENV_NOT_SET "getenv() does not find variable set"
/* list of environment variables to test */
char *environ_list[] = { "TERM", "NoTSetzWq", "TESTPROG" };
#define NUMBER_OF_ENVIRON (sizeof(environ_list)/sizeof(char *))
int TST_TOTAL = NUMBER_OF_ENVIRON;
static void cleanup(void)
{
tst_rmdir();
}
static void setup(void)
{
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
tst_tmpdir();
/* add a variable to the environment */
putenv("TESTPROG=FRKTCS04");
}
static void child_environment(void)
{
int fildes;
int index;
char msg[MAX_LINE_LENGTH];
char *var;
fildes = creat(OUTPUT_FILE, 0700);
for (index = 0; index < NUMBER_OF_ENVIRON; index++) {
memset(msg, 0, MAX_LINE_LENGTH);
var = getenv(environ_list[index]);
if (var == NULL)
(void)sprintf(msg, "%s:%s", environ_list[index],
ENV_NOT_SET);
else
(void)sprintf(msg, "%s:%s", environ_list[index], var);
/* includes extra null chars */
write(fildes, msg, sizeof(msg));
}
close(fildes);
}
/*
* Compare parent env string to child's string.
* Each string is in the format: <env var>:<value>
*/
static int cmp_env_strings(char *pstring, char *cstring)
{
char *penv, *cenv, *pvalue, *cvalue;
/*
* Break pstring into env and value
*/
penv = pstring;
pvalue = strchr(pstring, ':');
if (pvalue == NULL) {
tst_resm(TBROK,
"internal error - parent's env string not in correct format:'%s'",
pstring);
return -1;
} else {
*pvalue = '\0';
pvalue++;
if (*pvalue == '\0') {
tst_resm(TBROK,
"internal error - missing parent's env value");
return -1;
}
}
/*
* Break cstring into env and value
*/
cenv = cstring;
cvalue = strchr(cstring, ':');
if (cvalue == NULL) {
tst_resm(TBROK,
"internal error - parent's env string not in correct format:'%s'",
cstring);
return -1;
} else {
*cvalue = '\0';
cvalue++;
if (*cvalue == '\0') {
tst_resm(TBROK,
"internal error - missing child's env value");
return -1;
}
}
if (strcmp(penv, cenv) != 0) {
tst_resm(TBROK, "internal error - parent(%s) != child (%s) env",
penv, cenv);
return -1;
}
if (strcmp(pvalue, cvalue) != 0) {
tst_resm(TFAIL,
"Env var %s changed after fork(), parent's %s, child's %s",
penv, pvalue, cvalue);
} else {
tst_resm(TPASS, "Env var %s unchanged after fork(): %s",
penv, cvalue);
}
return 0;
}
/***************************************************************
* parent_environment - the parent side of the environment tests
* determine values for the variables
* read the values determined by the child
* compare values
***************************************************************/
void parent_environment(void)
{
int fildes;
char tmp_line[MAX_LINE_LENGTH];
char parent_value[MAX_LINE_LENGTH];
int index;
int ret;
char *var;
fildes = SAFE_OPEN(cleanup, OUTPUT_FILE, O_RDWR);
for (index = 0; index < NUMBER_OF_ENVIRON; index++) {
ret = read(fildes, tmp_line, MAX_LINE_LENGTH);
if (ret == 0) {
tst_resm(TBROK,
"fork() test. parent_environment: failed to read from file with %d (%s)",
errno, strerror(errno));
} else {
var = getenv(environ_list[index]);
if (var == NULL)
sprintf(parent_value, "%s:%s",
environ_list[index], ENV_NOT_SET);
else
sprintf(parent_value, "%s:%s",
environ_list[index], var);
cmp_env_strings(parent_value, tmp_line);
}
}
close(fildes);
}
int main(int ac, char **av)
{
int lc;
int kid_status;
int wait_status;
int fails;
tst_parse_opts(ac, av, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
fails = 0;
TEST(fork());
if (TEST_RETURN == -1) {
/* fork failed */
tst_brkm(TFAIL, cleanup,
"fork() failed with %d (%s)",
TEST_ERRNO, strerror(TEST_ERRNO));
} else if (TEST_RETURN == 0) {
/* child */
/* determine environment variables */
child_environment();
/* exit with known value */
exit(KIDEXIT);
} else {
/* parent of successful fork */
/* wait for the child to complete */
wait_status = waitpid(TEST_RETURN, &kid_status, 0);
/* validate the child exit status */
if (wait_status == TEST_RETURN) {
if (kid_status != KIDEXIT << 8) {
tst_brkm(TBROK, cleanup,
"fork(): Incorrect child status returned on wait(): %d",
kid_status);
fails++;
}
} else {
tst_brkm(TBROK, cleanup,
"fork(): wait() for child status failed with %d errno: %d : %s",
wait_status, errno,
strerror(errno));
fails++;
}
if (fails == 0) {
/* verification tests */
parent_environment();
}
}
}
cleanup();
tst_exit();
}