2 #include "run-command.h"
5 static inline void close_pair(int fd[2])
11 static inline void dup_devnull(int to)
13 int fd = open("/dev/null", O_RDWR);
18 int start_command(struct child_process *cmd)
20 int need_in, need_out, need_err;
21 int fdin[2], fdout[2], fderr[2];
24 * In case of errors we must keep the promise to close FDs
25 * that have been passed in via ->in and ->out.
28 need_in = !cmd->no_stdin && cmd->in < 0;
33 return -ERR_RUN_COMMAND_PIPE;
38 need_out = !cmd->no_stdout
39 && !cmd->stdout_to_stderr
42 if (pipe(fdout) < 0) {
47 return -ERR_RUN_COMMAND_PIPE;
52 need_err = !cmd->no_stderr && cmd->err < 0;
54 if (pipe(fderr) < 0) {
63 return -ERR_RUN_COMMAND_PIPE;
68 trace_argv_printf(cmd->argv, "trace: run_command:");
92 else if (cmd->stdout_to_stderr)
97 } else if (cmd->out > 1) {
102 if (cmd->dir && chdir(cmd->dir))
103 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
104 cmd->dir, strerror(errno));
106 for (; *cmd->env; cmd->env++) {
107 if (strchr(*cmd->env, '='))
108 putenv((char*)*cmd->env);
114 execv_git_cmd(cmd->argv);
116 execvp(cmd->argv[0], (char *const*) cmd->argv);
118 die("exec %s failed.", cmd->argv[0]);
121 int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
122 const char **sargv = cmd->argv;
123 char **env = environ;
128 } else if (need_in) {
131 } else if (cmd->in) {
136 if (cmd->no_stderr) {
139 } else if (need_err) {
144 if (cmd->no_stdout) {
147 } else if (cmd->stdout_to_stderr) {
150 } else if (need_out) {
153 } else if (cmd->out > 1) {
159 die("chdir in start_command() not implemented");
161 env = copy_environ();
162 for (; *cmd->env; cmd->env++)
163 env = env_setenv(env, *cmd->env);
167 cmd->argv = prepare_git_cmd(cmd->argv);
170 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
179 dup2(s0, 0), close(s0);
181 dup2(s1, 1), close(s1);
183 dup2(s2, 2), close(s2);
197 return -ERR_RUN_COMMAND_FORK;
216 static int wait_or_whine(pid_t pid)
220 pid_t waiting = waitpid(pid, &status, 0);
225 error("waitpid failed (%s)", strerror(errno));
226 return -ERR_RUN_COMMAND_WAITPID;
229 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
230 if (WIFSIGNALED(status))
231 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
233 if (!WIFEXITED(status))
234 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
235 code = WEXITSTATUS(status);
242 int finish_command(struct child_process *cmd)
244 return wait_or_whine(cmd->pid);
247 int run_command(struct child_process *cmd)
249 int code = start_command(cmd);
252 return finish_command(cmd);
255 static void prepare_run_command_v_opt(struct child_process *cmd,
259 memset(cmd, 0, sizeof(*cmd));
261 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
262 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
263 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
266 int run_command_v_opt(const char **argv, int opt)
268 struct child_process cmd;
269 prepare_run_command_v_opt(&cmd, argv, opt);
270 return run_command(&cmd);
273 int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
275 struct child_process cmd;
276 prepare_run_command_v_opt(&cmd, argv, opt);
278 return run_command(&cmd);
281 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
283 struct child_process cmd;
284 prepare_run_command_v_opt(&cmd, argv, opt);
287 return run_command(&cmd);
291 static __stdcall unsigned run_thread(void *data)
293 struct async *async = data;
294 return async->proc(async->fd_for_proc, async->data);
298 int start_async(struct async *async)
302 if (pipe(pipe_out) < 0)
303 return error("cannot create pipe: %s", strerror(errno));
304 async->out = pipe_out[0];
308 if (async->pid < 0) {
309 error("fork (async) failed: %s", strerror(errno));
310 close_pair(pipe_out);
315 exit(!!async->proc(pipe_out[1], async->data));
319 async->fd_for_proc = pipe_out[1];
320 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
322 error("cannot create thread: %s", strerror(errno));
323 close_pair(pipe_out);
330 int finish_async(struct async *async)
335 if (wait_or_whine(async->pid))
336 ret = error("waitpid (async) failed");
339 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
340 ret = error("waiting for thread failed: %lu", GetLastError());
341 else if (!GetExitCodeThread(async->tid, &ret))
342 ret = error("cannot get thread exit code: %lu", GetLastError());
343 CloseHandle(async->tid);