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/*
ctdb event script helper
Copyright (C) Amitay Isaacs 2013
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/filesys.h"
#include "ctdb_private.h"
static char *progname = NULL;
/* CTDB sends SIGTERM, when process must die */
static void sigterm(int sig)
{
pid_t pid;
/* all the child processes are running in the same process group */
pid = getpgrp();
if (pid == -1) {
kill(-getpid(), SIGKILL);
} else {
kill(-pid, SIGKILL);
}
_exit(0);
}
static int check_executable(const char *path)
{
struct stat st;
if (stat(path, &st) != 0) {
fprintf(stderr, "Failed to access '%s' - %s\n",
path, strerror(errno));
return errno;
}
if (!(st.st_mode & S_IXUSR)) {
return ENOEXEC;
}
return 0;
}
static void usage(void)
{
fprintf(stderr, "\n");
fprintf(stderr, "Usage: %s <log-fd> <output-fd> <script_path> <event> [<args>]\n",
progname);
}
int main(int argc, char *argv[])
{
int log_fd, write_fd;
pid_t pid;
int status, output;
progname = argv[0];
if (argc < 5) {
usage();
exit(1);
}
reset_scheduler();
log_fd = atoi(argv[1]);
write_fd = atoi(argv[2]);
set_close_on_exec(write_fd);
close(STDOUT_FILENO);
close(STDERR_FILENO);
dup2(log_fd, STDOUT_FILENO);
dup2(log_fd, STDERR_FILENO);
close(log_fd);
if (setpgid(0, 0) != 0) {
fprintf(stderr, "Failed to create process group for event script - %s\n",
strerror(errno));
exit(1);
}
signal(SIGTERM, sigterm);
pid = fork();
if (pid < 0) {
fprintf(stderr, "Failed to fork - %s\n", strerror(errno));
exit(errno);
}
if (pid == 0) {
int save_errno;
execv(argv[3], &argv[3]);
if (errno == EACCES) {
save_errno = check_executable(argv[3]);
} else {
save_errno = errno;
fprintf(stderr, "Error executing '%s' - %s\n",
argv[3], strerror(errno));
}
_exit(save_errno);
}
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
output = WEXITSTATUS(status);
if (output == ENOENT || output == ENOEXEC) {
output = -output;
}
write(write_fd, &output, sizeof(output));
exit(output);
}
exit(1);
}
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