#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <errno.h> #include <cutils/iosched_policy.h> static char *classes[] = {"none", "rt", "be", "idle", NULL}; int ionice_main(int argc, char *argv[]) { IoSchedClass clazz = IoSchedClass_NONE; int ioprio = 0; int pid; if(argc != 2 && argc != 4) { fprintf(stderr, "usage: ionice <pid> [none|rt|be|idle] [prio]\n"); return 1; } if (!(pid = atoi(argv[1]))) { fprintf(stderr, "Invalid pid specified\n"); return 1; } if (argc == 2) { if (android_get_ioprio(pid, &clazz, &ioprio)) { fprintf(stderr, "Failed to read priority (%s)\n", strerror(errno)); return 1; } fprintf(stdout, "Pid %d, class %s (%d), prio %d\n", pid, classes[clazz], clazz, ioprio); return 0; } if (!strcmp(argv[2], "none")) { clazz = IoSchedClass_NONE; } else if (!strcmp(argv[2], "rt")) { clazz = IoSchedClass_RT; } else if (!strcmp(argv[2], "be")) { clazz = IoSchedClass_BE; } else if (!strcmp(argv[2], "idle")) { clazz = IoSchedClass_IDLE; } else { fprintf(stderr, "Unsupported class '%s'\n", argv[2]); return 1; } ioprio = atoi(argv[3]); printf("Setting pid %d i/o class to %d, prio %d\n", pid, clazz, ioprio); if (android_set_ioprio(pid, clazz, ioprio)) { fprintf(stderr, "Failed to set priority (%s)\n", strerror(errno)); return 1; } return 0; }