static void
action_launch_child(svc_action_t *op)
{
int lpc;
/* SIGPIPE is ignored (which is different from signal blocking) by the gnutls library.
* Depending on the libqb version in use, libqb may set SIGPIPE to be ignored as well.
* We do not want this to be inherited by the child process. By resetting this the signal
* to the default behavior, we avoid some potential odd problems that occur during OCF
* scripts when SIGPIPE is ignored by the environment. */
signal(SIGPIPE, SIG_DFL);
#if defined(HAVE_SCHED_SETSCHEDULER)
if (sched_getscheduler(0) != SCHED_OTHER) {
struct sched_param sp;
memset(&sp, 0, sizeof(sp));
sp.sched_priority = 0;
if (sched_setscheduler(0, SCHED_OTHER, &sp) == -1) {
crm_perror(LOG_ERR, "Could not reset scheduling policy to SCHED_OTHER for %s", op->id);
}
}
#endif
if (setpriority(PRIO_PROCESS, 0, 0) == -1) {
crm_perror(LOG_ERR, "Could not reset process priority to 0 for %s", op->id);
}
/* Man: The call setpgrp() is equivalent to setpgid(0,0)
* _and_ compiles on BSD variants too
* need to investigate if it works the same too.
*/
setpgid(0, 0);
/* close all descriptors except stdin/out/err and channels to logd */
for (lpc = getdtablesize() - 1; lpc > STDERR_FILENO; lpc--) {
close(lpc);
}
#if SUPPORT_CIBSECRETS
if (replace_secret_params(op->rsc, op->params) < 0) {
/* replacing secrets failed! */
if (safe_str_eq(op->action,"stop")) {
/* don't fail on stop! */
crm_info("proceeding with the stop operation for %s", op->rsc);
} else {
crm_err("failed to get secrets for %s, "
"considering resource not configured", op->rsc);
_exit(PCMK_OCF_NOT_CONFIGURED);
}
}
#endif
/* Setup environment correctly */
add_OCF_env_vars(op);
/* execute the RA */
execvp(op->opaque->exec, op->opaque->args);
/* Most cases should have been already handled by stat() */
services_handle_exec_error(op, errno);
_exit(op->rc);
}
gboolean
services_os_action_execute(svc_action_t * op, gboolean synchronous)
{
int rc, lpc;
int stdout_fd[2];
int stderr_fd[2];
sigset_t mask;
sigset_t old_mask;
if (pipe(stdout_fd) < 0) {
crm_err("pipe() failed");
}
if (pipe(stderr_fd) < 0) {
crm_err("pipe() failed");
}
if (synchronous) {
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigemptyset(&old_mask);
if (sigprocmask(SIG_BLOCK, &mask, &old_mask) < 0) {
crm_perror(LOG_ERR, "sigprocmask() failed");
}
}
op->pid = fork();
switch (op->pid) {
case -1:
crm_err("fork() failed");
close(stdout_fd[0]);
close(stdout_fd[1]);
close(stderr_fd[0]);
close(stderr_fd[1]);
return FALSE;
case 0: /* Child */
/* Man: The call setpgrp() is equivalent to setpgid(0,0)
* _and_ compiles on BSD variants too
* need to investigate if it works the same too.
*/
setpgid(0, 0);
close(stdout_fd[0]);
close(stderr_fd[0]);
if (STDOUT_FILENO != stdout_fd[1]) {
if (dup2(stdout_fd[1], STDOUT_FILENO) != STDOUT_FILENO) {
crm_err("dup2() failed (stdout)");
}
close(stdout_fd[1]);
}
if (STDERR_FILENO != stderr_fd[1]) {
if (dup2(stderr_fd[1], STDERR_FILENO) != STDERR_FILENO) {
crm_err("dup2() failed (stderr)");
}
close(stderr_fd[1]);
}
/* close all descriptors except stdin/out/err and channels to logd */
for (lpc = getdtablesize() - 1; lpc > STDERR_FILENO; lpc--) {
close(lpc);
}
#if SUPPORT_CIBSECRETS
if (replace_secret_params(op->rsc, op->params) < 0) {
/* replacing secrets failed! */
if (safe_str_eq(op->action,"stop")) {
/* don't fail on stop! */
crm_info("proceeding with the stop operation for %s", op->rsc);
} else {
crm_err("failed to get secrets for %s, "
"considering resource not configured", op->rsc);
_exit(PCMK_OCF_NOT_CONFIGURED);
}
}
#endif
/* Setup environment correctly */
add_OCF_env_vars(op);
/* execute the RA */
execvp(op->opaque->exec, op->opaque->args);
switch (errno) { /* see execve(2) */
case ENOENT: /* No such file or directory */
case EISDIR: /* Is a directory */
rc = PCMK_OCF_NOT_INSTALLED;
#if SUPPORT_NAGIOS
if (safe_str_eq(op->standard, "nagios")) {
rc = NAGIOS_NOT_INSTALLED;
}
#endif
break;
case EACCES: /* permission denied (various errors) */
rc = PCMK_OCF_INSUFFICIENT_PRIV;
#if SUPPORT_NAGIOS
if (safe_str_eq(op->standard, "nagios")) {
rc = NAGIOS_INSUFFICIENT_PRIV;
}
#endif
break;
default:
rc = PCMK_OCF_UNKNOWN_ERROR;
break;
}
_exit(rc);
}
/* Only the parent reaches here */
close(stdout_fd[1]);
close(stderr_fd[1]);
op->opaque->stdout_fd = stdout_fd[0];
set_fd_opts(op->opaque->stdout_fd, O_NONBLOCK);
op->opaque->stderr_fd = stderr_fd[0];
set_fd_opts(op->opaque->stderr_fd, O_NONBLOCK);
if (synchronous) {
int status = 0;
int timeout = op->timeout;
int sfd = -1;
time_t start = -1;
struct pollfd fds[3];
int wait_rc = 0;
sfd = signalfd(-1, &mask, 0);
if (sfd < 0) {
crm_perror(LOG_ERR, "signalfd() failed");
}
fds[0].fd = op->opaque->stdout_fd;
fds[0].events = POLLIN;
fds[0].revents = 0;
fds[1].fd = op->opaque->stderr_fd;
fds[1].events = POLLIN;
fds[1].revents = 0;
fds[2].fd = sfd;
fds[2].events = POLLIN;
fds[2].revents = 0;
crm_trace("Waiting for %d", op->pid);
start = time(NULL);
do {
int poll_rc = poll(fds, 3, timeout);
if (poll_rc > 0) {
if (fds[0].revents & POLLIN) {
read_output(op->opaque->stdout_fd, op);
}
if (fds[1].revents & POLLIN) {
read_output(op->opaque->stderr_fd, op);
}
if (fds[2].revents & POLLIN) {
struct signalfd_siginfo fdsi;
ssize_t s;
s = read(sfd, &fdsi, sizeof(struct signalfd_siginfo));
if (s != sizeof(struct signalfd_siginfo)) {
crm_perror(LOG_ERR, "Read from signal fd %d failed", sfd);
} else if (fdsi.ssi_signo == SIGCHLD) {
wait_rc = waitpid(op->pid, &status, WNOHANG);
if (wait_rc < 0){
crm_perror(LOG_ERR, "waitpid() for %d failed", op->pid);
} else if (wait_rc > 0) {
break;
}
}
}
} else if (poll_rc == 0) {
timeout = 0;
break;
} else if (poll_rc < 0) {
if (errno != EINTR) {
crm_perror(LOG_ERR, "poll() failed");
break;
}
}
timeout = op->timeout - (time(NULL) - start) * 1000;
} while ((op->timeout < 0 || timeout > 0));
crm_trace("Child done: %d", op->pid);
if (wait_rc <= 0) {
int killrc = kill(op->pid, SIGKILL);
op->rc = PCMK_OCF_UNKNOWN_ERROR;
if (op->timeout > 0 && timeout <= 0) {
op->status = PCMK_LRM_OP_TIMEOUT;
crm_warn("%s:%d - timed out after %dms", op->id, op->pid, op->timeout);
} else {
op->status = PCMK_LRM_OP_ERROR;
}
if (killrc && errno != ESRCH) {
crm_err("kill(%d, KILL) failed: %d", op->pid, errno);
}
/*
* From sigprocmask(2):
* It is not possible to block SIGKILL or SIGSTOP. Attempts to do so are silently ignored.
*
* This makes it safe to skip WNOHANG here
*/
waitpid(op->pid, &status, 0);
} else if (WIFEXITED(status)) {
op->status = PCMK_LRM_OP_DONE;
op->rc = WEXITSTATUS(status);
crm_info("Managed %s process %d exited with rc=%d", op->id, op->pid, op->rc);
} else if (WIFSIGNALED(status)) {
int signo = WTERMSIG(status);
op->status = PCMK_LRM_OP_ERROR;
crm_err("Managed %s process %d exited with signal=%d", op->id, op->pid, signo);
}
#ifdef WCOREDUMP
if (WCOREDUMP(status)) {
crm_err("Managed %s process %d dumped core", op->id, op->pid);
}
#endif
read_output(op->opaque->stdout_fd, op);
read_output(op->opaque->stderr_fd, op);
close(op->opaque->stdout_fd);
close(op->opaque->stderr_fd);
close(sfd);
if (sigismember(&old_mask, SIGCHLD) == 0) {
if (sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0) {
crm_perror(LOG_ERR, "sigprocmask() to unblocked failed");
}
}
} else {
crm_trace("Async waiting for %d - %s", op->pid, op->opaque->exec);
mainloop_child_add(op->pid, op->timeout, op->id, op, operation_finished);
op->opaque->stdout_gsource = mainloop_add_fd(op->id,
G_PRIORITY_LOW,
op->opaque->stdout_fd, op, &stdout_callbacks);
op->opaque->stderr_gsource = mainloop_add_fd(op->id,
G_PRIORITY_LOW,
op->opaque->stderr_fd, op, &stderr_callbacks);
}
return TRUE;
}