diff options
Diffstat (limited to 'run-command.c')
| -rw-r--r-- | run-command.c | 109 |
1 files changed, 61 insertions, 48 deletions
diff --git a/run-command.c b/run-command.c index eb2efc3307..f3e7abb7de 100644 --- a/run-command.c +++ b/run-command.c @@ -19,6 +19,7 @@ int start_command(struct child_process *cmd) { int need_in, need_out, need_err; int fdin[2], fdout[2], fderr[2]; + int failed_errno = failed_errno; /* * In case of errors we must keep the promise to close FDs @@ -28,9 +29,10 @@ int start_command(struct child_process *cmd) need_in = !cmd->no_stdin && cmd->in < 0; if (need_in) { if (pipe(fdin) < 0) { + failed_errno = errno; if (cmd->out > 0) close(cmd->out); - return -ERR_RUN_COMMAND_PIPE; + goto fail_pipe; } cmd->in = fdin[1]; } @@ -40,11 +42,12 @@ int start_command(struct child_process *cmd) && cmd->out < 0; if (need_out) { if (pipe(fdout) < 0) { + failed_errno = errno; if (need_in) close_pair(fdin); else if (cmd->in) close(cmd->in); - return -ERR_RUN_COMMAND_PIPE; + goto fail_pipe; } cmd->out = fdout[0]; } @@ -52,6 +55,7 @@ int start_command(struct child_process *cmd) need_err = !cmd->no_stderr && cmd->err < 0; if (need_err) { if (pipe(fderr) < 0) { + failed_errno = errno; if (need_in) close_pair(fdin); else if (cmd->in) @@ -60,7 +64,11 @@ int start_command(struct child_process *cmd) close_pair(fdout); else if (cmd->out) close(cmd->out); - return -ERR_RUN_COMMAND_PIPE; +fail_pipe: + error("cannot create pipe for %s: %s", + cmd->argv[0], strerror(failed_errno)); + errno = failed_errno; + return -1; } cmd->err = fderr[0]; } @@ -101,8 +109,8 @@ int start_command(struct child_process *cmd) } if (cmd->dir && chdir(cmd->dir)) - die("exec %s: cd to %s failed (%s)", cmd->argv[0], - cmd->dir, strerror(errno)); + die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], + cmd->dir); if (cmd->env) { for (; *cmd->env; cmd->env++) { if (strchr(*cmd->env, '=')) @@ -122,6 +130,9 @@ int start_command(struct child_process *cmd) strerror(errno)); exit(127); } + if (cmd->pid < 0) + error("cannot fork() for %s: %s", cmd->argv[0], + strerror(failed_errno = errno)); #else int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */ const char **sargv = cmd->argv; @@ -173,6 +184,9 @@ int start_command(struct child_process *cmd) } cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env); + failed_errno = errno; + if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) + error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); if (cmd->env) free_environ(env); @@ -189,7 +203,6 @@ int start_command(struct child_process *cmd) #endif if (cmd->pid < 0) { - int err = errno; if (need_in) close_pair(fdin); else if (cmd->in) @@ -200,9 +213,8 @@ int start_command(struct child_process *cmd) close(cmd->out); if (need_err) close_pair(fderr); - return err == ENOENT ? - -ERR_RUN_COMMAND_EXEC : - -ERR_RUN_COMMAND_FORK; + errno = failed_errno; + return -1; } if (need_in) @@ -221,40 +233,51 @@ int start_command(struct child_process *cmd) return 0; } -static int wait_or_whine(pid_t pid) +static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure) { - for (;;) { - int status, code; - pid_t waiting = waitpid(pid, &status, 0); - - if (waiting < 0) { - if (errno == EINTR) - continue; - error("waitpid failed (%s)", strerror(errno)); - return -ERR_RUN_COMMAND_WAITPID; - } - if (waiting != pid) - return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; - if (WIFSIGNALED(status)) - return -ERR_RUN_COMMAND_WAITPID_SIGNAL; - - if (!WIFEXITED(status)) - return -ERR_RUN_COMMAND_WAITPID_NOEXIT; + int status, code = -1; + pid_t waiting; + int failed_errno = 0; + + while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) + ; /* nothing */ + + if (waiting < 0) { + failed_errno = errno; + error("waitpid for %s failed: %s", argv0, strerror(errno)); + } else if (waiting != pid) { + error("waitpid is confused (%s)", argv0); + } else if (WIFSIGNALED(status)) { + code = WTERMSIG(status); + error("%s died of signal %d", argv0, code); + /* + * This return value is chosen so that code & 0xff + * mimics the exit code that a POSIX shell would report for + * a program that died from this signal. + */ + code -= 128; + } else if (WIFEXITED(status)) { code = WEXITSTATUS(status); - switch (code) { - case 127: - return -ERR_RUN_COMMAND_EXEC; - case 0: - return 0; - default: - return -code; + /* + * Convert special exit code when execvp failed. + */ + if (code == 127) { + code = -1; + failed_errno = ENOENT; + if (!silent_exec_failure) + error("cannot run %s: %s", argv0, + strerror(ENOENT)); } + } else { + error("waitpid is confused (%s)", argv0); } + errno = failed_errno; + return code; } int finish_command(struct child_process *cmd) { - return wait_or_whine(cmd->pid); + return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure); } int run_command(struct child_process *cmd) @@ -274,6 +297,7 @@ static void prepare_run_command_v_opt(struct child_process *cmd, cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; + cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; } int run_command_v_opt(const char **argv, int opt) @@ -338,10 +362,7 @@ int start_async(struct async *async) int finish_async(struct async *async) { #ifndef __MINGW32__ - int ret = 0; - - if (wait_or_whine(async->pid)) - ret = error("waitpid (async) failed"); + int ret = wait_or_whine(async->pid, "child process", 0); #else DWORD ret = 0; if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0) @@ -385,15 +406,7 @@ int run_hook(const char *index_file, const char *name, ...) hook.env = env; } - ret = start_command(&hook); + ret = run_command(&hook); free(argv); - if (ret) { - warning("Could not spawn %s", argv[0]); - return ret; - } - ret = finish_command(&hook); - if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL) - warning("%s exited due to uncaught signal", argv[0]); - return ret; } |