2 ctdb event script helper
4 Copyright (C) Amitay Isaacs 2013
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "system/filesys.h"
22 #include "ctdb_private.h"
24 static char *progname = NULL;
27 /* CTDB sends SIGTERM, when process must die */
28 static void sigterm(int sig)
32 /* all the child processes are running in the same process group */
35 kill(-getpid(), SIGKILL);
42 static int check_executable(const char *path)
46 if (stat(path, &st) != 0) {
47 fprintf(stderr, "Failed to access '%s' - %s\n",
48 path, strerror(errno));
52 if (!(st.st_mode & S_IXUSR)) {
59 static void usage(void)
61 fprintf(stderr, "\n");
62 fprintf(stderr, "Usage: %s <log-fd> <output-fd> <script_path> <event> [<args>]\n",
66 int main(int argc, char *argv[])
70 int status, output, ret;
81 log_fd = atoi(argv[1]);
82 write_fd = atoi(argv[2]);
84 set_close_on_exec(write_fd);
88 dup2(log_fd, STDOUT_FILENO);
89 dup2(log_fd, STDERR_FILENO);
92 if (setpgid(0, 0) != 0) {
93 fprintf(stderr, "Failed to create process group for event script - %s\n",
98 signal(SIGTERM, sigterm);
102 int save_errno = errno;
103 fprintf(stderr, "Failed to fork - %s\n", strerror(errno));
104 sys_write(write_fd, &save_errno, sizeof(save_errno));
109 ret = check_executable(argv[3]);
113 ret = execv(argv[3], &argv[3]);
115 int save_errno = errno;
116 fprintf(stderr, "Error executing '%s' - %s\n",
117 argv[3], strerror(save_errno));
119 /* This should never happen */
123 ret = waitpid(pid, &status, 0);
126 fprintf(stderr, "waitpid() failed - %s\n", strerror(errno));
127 sys_write(write_fd, &output, sizeof(output));
130 if (WIFEXITED(status)) {
131 output = -WEXITSTATUS(status);
132 sys_write(write_fd, &output, sizeof(output));
135 if (WIFSIGNALED(status)) {
137 fprintf(stderr, "Process terminated with signal - %d\n",
139 sys_write(write_fd, &output, sizeof(output));
143 fprintf(stderr, "waitpid() status=%d\n", status);