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9e6e48750d
Do not run helper processes with real-time priority. This regression was caused when locking and eventscript code switched to use vfork() and helper instead of ctdb_fork(). Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net> Autobuild-User(master): Martin Schwenke <martins@samba.org> Autobuild-Date(master): Thu Jun 12 08:10:36 CEST 2014 on sn-devel-104
132 lines
2.6 KiB
C
132 lines
2.6 KiB
C
/*
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ctdb event script helper
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Copyright (C) Amitay Isaacs 2013
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "ctdb_private.h"
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static char *progname = NULL;
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/* CTDB sends SIGTERM, when process must die */
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static void sigterm(int sig)
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{
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pid_t pid;
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/* all the child processes are running in the same process group */
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pid = getpgrp();
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if (pid == -1) {
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kill(-getpid(), SIGKILL);
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} else {
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kill(-pid, SIGKILL);
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}
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_exit(0);
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}
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static int check_executable(const char *path)
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{
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struct stat st;
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if (stat(path, &st) != 0) {
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fprintf(stderr, "Failed to access '%s' - %s\n",
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path, strerror(errno));
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return errno;
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}
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if (!(st.st_mode & S_IXUSR)) {
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return ENOEXEC;
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}
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return 0;
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}
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static void usage(void)
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{
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fprintf(stderr, "\n");
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fprintf(stderr, "Usage: %s <log-fd> <output-fd> <script_path> <event> [<args>]\n",
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progname);
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}
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int main(int argc, char *argv[])
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{
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int log_fd, write_fd;
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pid_t pid;
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int status, output;
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progname = argv[0];
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if (argc < 5) {
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usage();
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exit(1);
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}
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reset_scheduler();
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log_fd = atoi(argv[1]);
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write_fd = atoi(argv[2]);
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set_close_on_exec(write_fd);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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dup2(log_fd, STDOUT_FILENO);
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dup2(log_fd, STDERR_FILENO);
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close(log_fd);
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if (setpgid(0, 0) != 0) {
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fprintf(stderr, "Failed to create process group for event script - %s\n",
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strerror(errno));
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exit(1);
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}
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signal(SIGTERM, sigterm);
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pid = fork();
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if (pid < 0) {
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fprintf(stderr, "Failed to fork - %s\n", strerror(errno));
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exit(errno);
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}
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if (pid == 0) {
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int save_errno;
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execv(argv[3], &argv[3]);
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if (errno == EACCES) {
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save_errno = check_executable(argv[3]);
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} else {
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save_errno = errno;
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fprintf(stderr, "Error executing '%s' - %s\n",
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argv[3], strerror(errno));
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}
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_exit(save_errno);
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}
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waitpid(pid, &status, 0);
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if (WIFEXITED(status)) {
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output = WEXITSTATUS(status);
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if (output == ENOENT || output == ENOEXEC) {
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output = -output;
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}
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write(write_fd, &output, sizeof(output));
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exit(output);
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}
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exit(1);
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}
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