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#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <sched.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/resource.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "proc.h"
#include "die.h"
void cpu_affinity(int cpu)
{
int ret;
cpu_set_t cpu_bitmask;
CPU_ZERO(&cpu_bitmask);
CPU_SET(cpu, &cpu_bitmask);
ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
&cpu_bitmask);
if (ret)
panic("Can't set this cpu affinity!\n");
}
int set_proc_prio(int priority)
{
int ret = setpriority(PRIO_PROCESS, getpid(), priority);
if (ret)
panic("Can't set nice val to %i!\n", priority);
return 0;
}
int set_sched_status(int policy, int priority)
{
int ret, min_prio, max_prio;
struct sched_param sp;
max_prio = sched_get_priority_max(policy);
min_prio = sched_get_priority_min(policy);
if (max_prio == -1 || min_prio == -1)
printf("Cannot determine scheduler prio limits!\n");
else if (priority < min_prio)
priority = min_prio;
else if (priority > max_prio)
priority = max_prio;
memset(&sp, 0, sizeof(sp));
sp.sched_priority = priority;
ret = sched_setscheduler(getpid(), policy, &sp);
if (ret) {
printf("Cannot set scheduler policy!\n");
return -EINVAL;
}
ret = sched_setparam(getpid(), &sp);
if (ret) {
printf("Cannot set scheduler prio!\n");
return -EINVAL;
}
return 0;
}
ssize_t proc_get_cmdline(unsigned int pid, char *cmdline, size_t len)
{
ssize_t ret;
char path[1024];
snprintf(path, sizeof(path), "/proc/%u/exe", pid);
ret = readlink(path, cmdline, len - 1);
if (ret < 0)
cmdline[0] = '\0';
else
cmdline[ret] = '\0';
return ret;
}
int proc_exec(const char *proc, char *const argv[])
{
int status;
pid_t pid;
pid = fork();
if (pid < 0) {
perror("fork");
return -1;
} else if (pid == 0) {
if (execvp(proc, argv) < 0)
fprintf(stderr, "Failed to exec: %s\n", proc);
_exit(1);
}
if (waitpid(pid, &status, 0) < 0) {
perror("waitpid");
return -2;
}
if (!WIFEXITED(status))
return -WEXITSTATUS(status);
return 0;
}
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