int need_in, need_out, need_err;
int fdin[2], fdout[2], fderr[2];
+ /*
+ * In case of errors we must keep the promise to close FDs
+ * that have been passed in via ->in and ->out.
+ */
+
need_in = !cmd->no_stdin && cmd->in < 0;
if (need_in) {
- if (pipe(fdin) < 0)
+ if (pipe(fdin) < 0) {
+ if (cmd->out > 0)
+ close(cmd->out);
return -ERR_RUN_COMMAND_PIPE;
+ }
cmd->in = fdin[1];
- cmd->close_in = 1;
}
need_out = !cmd->no_stdout
if (pipe(fdout) < 0) {
if (need_in)
close_pair(fdin);
+ else if (cmd->in)
+ close(cmd->in);
return -ERR_RUN_COMMAND_PIPE;
}
cmd->out = fdout[0];
- cmd->close_out = 1;
}
need_err = !cmd->no_stderr && cmd->err < 0;
if (pipe(fderr) < 0) {
if (need_in)
close_pair(fdin);
+ else if (cmd->in)
+ close(cmd->in);
if (need_out)
close_pair(fdout);
+ else if (cmd->out)
+ close(cmd->out);
return -ERR_RUN_COMMAND_PIPE;
}
cmd->err = fderr[0];
}
- cmd->pid = fork();
- if (cmd->pid < 0) {
- if (need_in)
- close_pair(fdin);
- if (need_out)
- close_pair(fdout);
- if (need_err)
- close_pair(fderr);
- return -ERR_RUN_COMMAND_FORK;
- }
+ trace_argv_printf(cmd->argv, "trace: run_command:");
+#ifndef __MINGW32__
+ fflush(NULL);
+ cmd->pid = fork();
if (!cmd->pid) {
if (cmd->no_stdin)
dup_devnull(0);
close(cmd->in);
}
+ if (cmd->no_stderr)
+ dup_devnull(2);
+ else if (need_err) {
+ dup2(fderr[1], 2);
+ close_pair(fderr);
+ }
+
if (cmd->no_stdout)
dup_devnull(1);
else if (cmd->stdout_to_stderr)
close(cmd->out);
}
- if (cmd->no_stderr)
- dup_devnull(2);
- else if (need_err) {
- dup2(fderr[1], 2);
- close_pair(fderr);
- }
-
if (cmd->dir && chdir(cmd->dir))
die("exec %s: cd to %s failed (%s)", cmd->argv[0],
cmd->dir, strerror(errno));
unsetenv(*cmd->env);
}
}
+ if (cmd->preexec_cb)
+ cmd->preexec_cb();
if (cmd->git_cmd) {
execv_git_cmd(cmd->argv);
} else {
}
die("exec %s failed.", cmd->argv[0]);
}
+#else
+ int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
+ const char **sargv = cmd->argv;
+ char **env = environ;
+
+ if (cmd->no_stdin) {
+ s0 = dup(0);
+ dup_devnull(0);
+ } else if (need_in) {
+ s0 = dup(0);
+ dup2(fdin[0], 0);
+ } else if (cmd->in) {
+ s0 = dup(0);
+ dup2(cmd->in, 0);
+ }
+
+ if (cmd->no_stderr) {
+ s2 = dup(2);
+ dup_devnull(2);
+ } else if (need_err) {
+ s2 = dup(2);
+ dup2(fderr[1], 2);
+ }
+
+ if (cmd->no_stdout) {
+ s1 = dup(1);
+ dup_devnull(1);
+ } else if (cmd->stdout_to_stderr) {
+ s1 = dup(1);
+ dup2(2, 1);
+ } else if (need_out) {
+ s1 = dup(1);
+ dup2(fdout[1], 1);
+ } else if (cmd->out > 1) {
+ s1 = dup(1);
+ dup2(cmd->out, 1);
+ }
+
+ if (cmd->dir)
+ die("chdir in start_command() not implemented");
+ if (cmd->env) {
+ env = copy_environ();
+ for (; *cmd->env; cmd->env++)
+ env = env_setenv(env, *cmd->env);
+ }
+
+ if (cmd->git_cmd) {
+ cmd->argv = prepare_git_cmd(cmd->argv);
+ }
+
+ cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
+
+ if (cmd->env)
+ free_environ(env);
+ if (cmd->git_cmd)
+ free(cmd->argv);
+
+ cmd->argv = sargv;
+ if (s0 >= 0)
+ dup2(s0, 0), close(s0);
+ if (s1 >= 0)
+ dup2(s1, 1), close(s1);
+ if (s2 >= 0)
+ dup2(s2, 2), close(s2);
+#endif
+
+ if (cmd->pid < 0) {
+ if (need_in)
+ close_pair(fdin);
+ else if (cmd->in)
+ close(cmd->in);
+ if (need_out)
+ close_pair(fdout);
+ else if (cmd->out)
+ close(cmd->out);
+ if (need_err)
+ close_pair(fderr);
+ return -ERR_RUN_COMMAND_FORK;
+ }
if (need_in)
close(fdin[0]);
if (need_out)
close(fdout[1]);
- else if (cmd->out > 1)
+ else if (cmd->out)
close(cmd->out);
if (need_err)
int finish_command(struct child_process *cmd)
{
- if (cmd->close_in)
- close(cmd->in);
- if (cmd->close_out)
- close(cmd->out);
return wait_or_whine(cmd->pid);
}
return run_command(&cmd);
}
+#ifdef __MINGW32__
+static __stdcall unsigned run_thread(void *data)
+{
+ struct async *async = data;
+ return async->proc(async->fd_for_proc, async->data);
+}
+#endif
+
int start_async(struct async *async)
{
int pipe_out[2];
if (pipe(pipe_out) < 0)
return error("cannot create pipe: %s", strerror(errno));
+ async->out = pipe_out[0];
+
+#ifndef __MINGW32__
+ /* Flush stdio before fork() to avoid cloning buffers */
+ fflush(NULL);
async->pid = fork();
if (async->pid < 0) {
close(pipe_out[0]);
exit(!!async->proc(pipe_out[1], async->data));
}
- async->out = pipe_out[0];
close(pipe_out[1]);
+#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;
+ }
+#endif
return 0;
}
int finish_async(struct async *async)
{
+#ifndef __MINGW32__
int ret = 0;
if (wait_or_whine(async->pid))
ret = error("waitpid (async) failed");
+#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);
+#endif
return ret;
}