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);
116 execv_git_cmd(cmd->argv);
118 execvp(cmd->argv[0], (char *const*) cmd->argv);
120 die("exec %s failed.", cmd->argv[0]);
123 int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
124 const char *sargv0 = cmd->argv[0];
125 char **env = environ;
126 struct strbuf git_cmd;
131 } else if (need_in) {
134 } else if (cmd->in) {
139 if (cmd->no_stderr) {
142 } else if (need_err) {
147 if (cmd->no_stdout) {
150 } else if (cmd->stdout_to_stderr) {
153 } else if (need_out) {
156 } else if (cmd->out > 1) {
162 die("chdir in start_command() not implemented");
164 env = copy_environ();
165 for (; *cmd->env; cmd->env++)
166 env = env_setenv(env, *cmd->env);
170 strbuf_init(&git_cmd, 0);
171 strbuf_addf(&git_cmd, "git-%s", cmd->argv[0]);
172 cmd->argv[0] = git_cmd.buf;
175 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
180 strbuf_release(&git_cmd);
182 cmd->argv[0] = sargv0;
184 dup2(s0, 0), close(s0);
186 dup2(s1, 1), close(s1);
188 dup2(s2, 2), close(s2);
202 return -ERR_RUN_COMMAND_FORK;
221 static int wait_or_whine(pid_t pid)
225 pid_t waiting = waitpid(pid, &status, 0);
230 error("waitpid failed (%s)", strerror(errno));
231 return -ERR_RUN_COMMAND_WAITPID;
234 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
235 if (WIFSIGNALED(status))
236 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
238 if (!WIFEXITED(status))
239 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
240 code = WEXITSTATUS(status);
247 int finish_command(struct child_process *cmd)
249 return wait_or_whine(cmd->pid);
252 int run_command(struct child_process *cmd)
254 int code = start_command(cmd);
257 return finish_command(cmd);
260 static void prepare_run_command_v_opt(struct child_process *cmd,
264 memset(cmd, 0, sizeof(*cmd));
266 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
267 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
268 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
271 int run_command_v_opt(const char **argv, int opt)
273 struct child_process cmd;
274 prepare_run_command_v_opt(&cmd, argv, opt);
275 return run_command(&cmd);
278 int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
280 struct child_process cmd;
281 prepare_run_command_v_opt(&cmd, argv, opt);
283 return run_command(&cmd);
286 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
288 struct child_process cmd;
289 prepare_run_command_v_opt(&cmd, argv, opt);
292 return run_command(&cmd);
296 static __stdcall unsigned run_thread(void *data)
298 struct async *async = data;
299 return async->proc(async->fd_for_proc, async->data);
303 int start_async(struct async *async)
307 if (pipe(pipe_out) < 0)
308 return error("cannot create pipe: %s", strerror(errno));
309 async->out = pipe_out[0];
313 if (async->pid < 0) {
314 error("fork (async) failed: %s", strerror(errno));
315 close_pair(pipe_out);
320 exit(!!async->proc(pipe_out[1], async->data));
324 async->fd_for_proc = pipe_out[1];
325 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
327 error("cannot create thread: %s", strerror(errno));
328 close_pair(pipe_out);
335 int finish_async(struct async *async)
340 if (wait_or_whine(async->pid))
341 ret = error("waitpid (async) failed");
344 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
345 ret = error("waiting for thread failed: %lu", GetLastError());
346 else if (!GetExitCodeThread(async->tid, &ret))
347 ret = error("cannot get thread exit code: %lu", GetLastError());
348 CloseHandle(async->tid);