static void notify_parent(void)
{
- write(child_notifier, "", 1);
+ ssize_t unused;
+ unused = write(child_notifier, "", 1);
}
static NORETURN void die_child(const char *err, va_list params)
{
char msg[4096];
+ ssize_t unused;
int len = vsnprintf(msg, sizeof(msg), err, params);
if (len > sizeof(msg))
len = sizeof(msg);
- write(child_err, "fatal: ", 7);
- write(child_err, msg, len);
- write(child_err, "\n", 1);
+ unused = write(child_err, "fatal: ", 7);
+ unused = write(child_err, msg, len);
+ unused = write(child_err, "\n", 1);
exit(128);
}
+#endif
static inline void set_cloexec(int fd)
{
if (flags >= 0)
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
}
-#endif
static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
{
else if (need_err) {
dup2(fderr[1], 2);
close_pair(fderr);
+ } else if (cmd->err > 1) {
+ dup2(cmd->err, 2);
+ close(cmd->err);
}
if (cmd->no_stdout)
fherr = open("/dev/null", O_RDWR);
else if (need_err)
fherr = dup(fderr[1]);
+ else if (cmd->err > 2)
+ fherr = dup(cmd->err);
if (cmd->no_stdout)
fhout = open("/dev/null", O_RDWR);
close(cmd->out);
if (need_err)
close_pair(fderr);
+ else if (cmd->err)
+ close(cmd->err);
errno = failed_errno;
return -1;
}
if (need_err)
close(fderr[1]);
+ else if (cmd->err)
+ close(cmd->err);
return 0;
}
return run_command(&cmd);
}
-#ifdef WIN32
-static unsigned __stdcall run_thread(void *data)
+#ifndef NO_PTHREADS
+static pthread_t main_thread;
+static int main_thread_set;
+static pthread_key_t async_key;
+
+static void *run_thread(void *data)
{
struct async *async = data;
- return async->proc(async->fd_for_proc, async->data);
+ intptr_t ret;
+
+ pthread_setspecific(async_key, async);
+ ret = async->proc(async->proc_in, async->proc_out, async->data);
+ return (void *)ret;
+}
+
+static NORETURN void die_async(const char *err, va_list params)
+{
+ vreportf("fatal: ", err, params);
+
+ if (!pthread_equal(main_thread, pthread_self())) {
+ struct async *async = pthread_getspecific(async_key);
+ if (async->proc_in >= 0)
+ close(async->proc_in);
+ if (async->proc_out >= 0)
+ close(async->proc_out);
+ pthread_exit((void *)128);
+ }
+
+ exit(128);
}
#endif
int start_async(struct async *async)
{
- int pipe_out[2];
+ int need_in, need_out;
+ int fdin[2], fdout[2];
+ int proc_in, proc_out;
- if (pipe(pipe_out) < 0)
- return error("cannot create pipe: %s", strerror(errno));
- async->out = pipe_out[0];
+ need_in = async->in < 0;
+ if (need_in) {
+ if (pipe(fdin) < 0) {
+ if (async->out > 0)
+ close(async->out);
+ return error("cannot create pipe: %s", strerror(errno));
+ }
+ async->in = fdin[1];
+ }
-#ifndef WIN32
+ need_out = async->out < 0;
+ if (need_out) {
+ if (pipe(fdout) < 0) {
+ if (need_in)
+ close_pair(fdin);
+ else if (async->in)
+ close(async->in);
+ return error("cannot create pipe: %s", strerror(errno));
+ }
+ async->out = fdout[0];
+ }
+
+ if (need_in)
+ proc_in = fdin[0];
+ else if (async->in)
+ proc_in = async->in;
+ else
+ proc_in = -1;
+
+ if (need_out)
+ proc_out = fdout[1];
+ else if (async->out)
+ proc_out = async->out;
+ else
+ proc_out = -1;
+
+#ifdef NO_PTHREADS
/* Flush stdio before fork() to avoid cloning buffers */
fflush(NULL);
async->pid = fork();
if (async->pid < 0) {
error("fork (async) failed: %s", strerror(errno));
- close_pair(pipe_out);
- return -1;
+ goto error;
}
if (!async->pid) {
- close(pipe_out[0]);
- exit(!!async->proc(pipe_out[1], async->data));
+ if (need_in)
+ close(fdin[1]);
+ if (need_out)
+ close(fdout[0]);
+ exit(!!async->proc(proc_in, proc_out, async->data));
}
- close(pipe_out[1]);
+
+ if (need_in)
+ close(fdin[0]);
+ else if (async->in)
+ close(async->in);
+
+ if (need_out)
+ close(fdout[1]);
+ else if (async->out)
+ close(async->out);
#else
- async->fd_for_proc = pipe_out[1];
- async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
- if (!async->tid) {
- error("cannot create thread: %s", strerror(errno));
- close_pair(pipe_out);
- return -1;
+ if (!main_thread_set) {
+ /*
+ * We assume that the first time that start_async is called
+ * it is from the main thread.
+ */
+ main_thread_set = 1;
+ main_thread = pthread_self();
+ pthread_key_create(&async_key, NULL);
+ set_die_routine(die_async);
+ }
+
+ if (proc_in >= 0)
+ set_cloexec(proc_in);
+ if (proc_out >= 0)
+ set_cloexec(proc_out);
+ async->proc_in = proc_in;
+ async->proc_out = proc_out;
+ {
+ int err = pthread_create(&async->tid, NULL, run_thread, async);
+ if (err) {
+ error("cannot create thread: %s", strerror(err));
+ goto error;
+ }
}
#endif
return 0;
+
+error:
+ if (need_in)
+ close_pair(fdin);
+ else if (async->in)
+ close(async->in);
+
+ if (need_out)
+ close_pair(fdout);
+ else if (async->out)
+ close(async->out);
+ return -1;
}
int finish_async(struct async *async)
{
-#ifndef WIN32
- int ret = wait_or_whine(async->pid, "child process", 0);
+#ifdef NO_PTHREADS
+ return wait_or_whine(async->pid, "child process", 0);
#else
- DWORD ret = 0;
- if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
- ret = error("waiting for thread failed: %lu", GetLastError());
- else if (!GetExitCodeThread(async->tid, &ret))
- ret = error("cannot get thread exit code: %lu", GetLastError());
- CloseHandle(async->tid);
+ void *ret = (void *)(intptr_t)(-1);
+
+ if (pthread_join(async->tid, &ret))
+ error("pthread_join failed");
+ return (int)(intptr_t)ret;
#endif
- return ret;
}
int run_hook(const char *index_file, const char *name, ...)