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authorJunio C Hamano <gitster@pobox.com>2009-08-11 05:14:57 (GMT)
committerJunio C Hamano <gitster@pobox.com>2009-08-11 05:14:57 (GMT)
commit08ac69685a5b6bea45df1fd62ea1d9b7c0258d0b (patch)
tree3f3ccdcda78c82ed450666d22a0b463cf3eac6b3 /run-command.c
parent0c4f21e452dca5a705c36ca7e363c1a3b3c2a5b8 (diff)
parent0b91322311b649a4b5f9581fec2dca9e1c2da716 (diff)
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Merge branch 'js/run-command-updates'
* js/run-command-updates: api-run-command.txt: describe error behavior of run_command functions run-command.c: squelch a "use before assignment" warning receive-pack: remove unnecessary run_status report run_command: report failure to execute the program, but optionally don't run_command: encode deadly signal number in the return value run_command: report system call errors instead of returning error codes run_command: return exit code as positive value MinGW: simplify waitpid() emulation macros
Diffstat (limited to 'run-command.c')
-rw-r--r--run-command.c105
1 files changed, 59 insertions, 46 deletions
diff --git a/run-command.c b/run-command.c
index ff3d8e2..f3e7abb 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];
}
@@ -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;
}