/**
* @brief SIGCHILD signal handler
*
* @param sig signal number
*/
void sigchild_handler(int sig) {
UNUSED(sig);
struct pidlist_item_t * item;
pid_t child_pid = waitpid(-1, NULL, WNOHANG);
if ((item = pidlist_find(&pidlist, child_pid))) { // was it running on background?
pidlist_remove(&pidlist, item);
fprintf(stderr, MSG_SIGCHILD, child_pid);
}
}
static void childsig_handler(int signum) {
if (signum != SIGCHLD) {
return;
}
int chld_stat = 0;
/* Wait for the child to exit */
pid_t ret = wait(&chld_stat);
/* Log the child termination and return value */
if (ret == -1) {
bb_log(LOG_DEBUG, "SIGCHILD received, but wait failed with %s\n",
strerror(errno));
} else if (WIFEXITED(chld_stat)) {
bb_log(LOG_DEBUG, "Process with PID %i returned code %i\n", ret,
WEXITSTATUS (chld_stat));
} else if (WIFSIGNALED(chld_stat)) {
bb_log(LOG_DEBUG, "Process with PID %i terminated with %i\n", ret,
WTERMSIG(chld_stat));
}
pidlist_remove(ret);
}//childsig_handler
/**
* Forks and runs the given application and waits for the process to finish
*
* @param argv The arguments values, the first one is the program
* @param detached non-zero if the std in/output must be redirected to /dev/null, zero otherwise
* @return Exit code of the program (between 0 and 255) or -1 on failure
*/
int bb_run_fork(char **argv, int detached) {
int exitcode = -1;
check_handler();
/* Fork and attempt to run given application */
pid_t pid = fork();
if (pid == 0) {
/* child process after fork */
if (detached) {
bb_run_exec_detached(argv);
} else {
bb_run_exec(argv);
}
} else if (pid > 0) {
/* parent process after fork */
int status = 0;
bb_log(LOG_DEBUG, "Process %s started, PID %i.\n", argv[0], pid);
pidlist_add(pid);
if (waitpid(pid, &status, 0) != -1) {
if (WIFEXITED(status)) {
/* program exited normally, return status */
exitcode = WEXITSTATUS(status);
} else if (WIFSIGNALED(status)) {
/* program was terminated by a signal */
exitcode = 128 + WTERMSIG(status);
}
} else {
bb_log(LOG_ERR, "waitpid(%i) faild with %s\n", pid, strerror(errno));
}
pidlist_remove(pid);
} else {
/* Fork failed */
bb_log(LOG_ERR, "Process %s could not be started. fork() failed.\n", argv[0]);
}
/* could not determine return value */
return exitcode;
}
