static void spawn_haproxy(char **pid_strv, int nb_pid)
{
char haproxy_bin[512];
pid_t pid;
int main_argc;
char **main_argv;
main_argc = wrapper_argc - 1;
main_argv = wrapper_argv + 1;
//pid = fork();
pid=0;
if (!pid) {
/* 3 for "haproxy -Ds -sf" */
char **argv = calloc(4 + main_argc + nb_pid + 1, sizeof(char *));
int i;
int argno = 0;
locate_haproxy(haproxy_bin, 512);
argv[argno++] = haproxy_bin;
for (i = 0; i < main_argc; ++i)
argv[argno++] = main_argv[i];
argv[argno++] = "-Ds";
if (nb_pid > 0) {
argv[argno++] = "-sf";
for (i = 0; i < nb_pid; ++i)
argv[argno++] = pid_strv[i];
}
argv[argno] = NULL;
fprintf(stderr, SD_DEBUG "haproxy-systemd-wrapper: executing ");
for (i = 0; argv[i]; ++i)
fprintf(stderr, "%s ", argv[i]);
fprintf(stderr, "\n");
execv(argv[0], argv);
exit(0);
}
}
/* Note: this function must not exit in case of error (except in the child), as
* it is only dedicated the starting a new haproxy process. By keeping the
* process alive it will ensure that future signal delivery may get rid of
* the issue. If the first startup fails, the wrapper will notice it and
* return an error thanks to wait() returning ECHILD.
*/
static void spawn_haproxy(char **pid_strv, int nb_pid)
{
char haproxy_bin[512];
pid_t pid;
int main_argc;
char **main_argv;
int pipefd[2];
char fdstr[20];
int ret;
main_argc = wrapper_argc - 1;
main_argv = wrapper_argv + 1;
if (pipe(pipefd) != 0) {
fprintf(stderr, SD_NOTICE "haproxy-systemd-wrapper: failed to create a pipe, please try again later.\n");
return;
}
pid = fork();
if (!pid) {
char **argv;
int i;
int argno = 0;
/* 3 for "haproxy -Ds -sf" */
argv = calloc(4 + main_argc + nb_pid + 1, sizeof(char *));
if (!argv) {
fprintf(stderr, SD_NOTICE "haproxy-systemd-wrapper: failed to calloc(), please try again later.\n");
exit(1);
}
reset_signal_handler();
close(pipefd[0]); /* close the read side */
snprintf(fdstr, sizeof(fdstr), "%d", pipefd[1]);
if (setenv("HAPROXY_WRAPPER_FD", fdstr, 1) != 0) {
fprintf(stderr, SD_NOTICE "haproxy-systemd-wrapper: failed to setenv(), please try again later.\n");
exit(1);
}
locate_haproxy(haproxy_bin, 512);
argv[argno++] = haproxy_bin;
for (i = 0; i < main_argc; ++i)
argv[argno++] = main_argv[i];
argv[argno++] = "-Ds";
if (nb_pid > 0) {
argv[argno++] = "-sf";
for (i = 0; i < nb_pid; ++i)
argv[argno++] = pid_strv[i];
}
argv[argno] = NULL;
fprintf(stderr, SD_DEBUG "haproxy-systemd-wrapper: executing ");
for (i = 0; argv[i]; ++i)
fprintf(stderr, "%s ", argv[i]);
fprintf(stderr, "\n");
execv(argv[0], argv);
fprintf(stderr, SD_NOTICE "haproxy-systemd-wrapper: execv(%s) failed, please try again later.\n", argv[0]);
exit(1);
}
else if (pid == -1) {
fprintf(stderr, SD_NOTICE "haproxy-systemd-wrapper: failed to fork(), please try again later.\n");
}
/* The parent closes the write side and waits for the child to close it
* as well. Also deal the case where the fd would unexpectedly be 1 or 2
* by silently draining all data.
*/
close(pipefd[1]);
do {
char c;
ret = read(pipefd[0], &c, sizeof(c));
} while ((ret > 0) || (ret == -1 && errno == EINTR));
/* the child has finished starting up */
close(pipefd[0]);
}
