Function crm_pid_active

lib/common/utils.c:1224–1267

#define	LOCKSTRLEN	11

int
crm_pid_active(long pid)
{
    if (pid <= 0) {
        return -1;

    } else if (kill(pid, 0) < 0 && errno == ESRCH) {
        return 0;
    }
#ifndef HAVE_PROC_PID
    return 1;
#else
    {
        int rc = 0;
        int running = 0;
        char proc_path[PATH_MAX], exe_path[PATH_MAX], myexe_path[PATH_MAX];

        /* check to make sure pid hasn't been reused by another process */
        snprintf(proc_path, sizeof(proc_path), "/proc/%lu/exe", pid);

        rc = readlink(proc_path, exe_path, PATH_MAX - 1);
        if (rc < 0) {
            crm_perror(LOG_ERR, "Could not read from %s", proc_path);
            goto bail;
        }

        exe_path[rc] = 0;
        snprintf(proc_path, sizeof(proc_path), "/proc/%lu/exe", (long unsigned int)getpid());
        rc = readlink(proc_path, myexe_path, PATH_MAX - 1);
        if (rc < 0) {
            crm_perror(LOG_ERR, "Could not read from %s", proc_path);
            goto bail;
        }

        myexe_path[rc] = 0;
        if (strcmp(exe_path, myexe_path) == 0) {
            running = 1;
        }
    }

  bail:
    return running;
#endif
}

static int
crm_read_pidfile(const char *filename)