summaryrefslogtreecommitdiff
path: root/run-command.c
diff options
context:
space:
mode:
Diffstat (limited to 'run-command.c')
-rw-r--r--run-command.c46
1 files changed, 43 insertions, 3 deletions
diff --git a/run-command.c b/run-command.c
index cf2d8f7..02c7bfb 100644
--- a/run-command.c
+++ b/run-command.c
@@ -15,6 +15,30 @@ static inline void dup_devnull(int to)
close(fd);
}
+#ifndef WIN32
+static int child_err = 2;
+
+static NORETURN void die_child(const char *err, va_list params)
+{
+ char msg[4096];
+ int len = vsnprintf(msg, sizeof(msg), err, params);
+ if (len > sizeof(msg))
+ len = sizeof(msg);
+
+ write(child_err, "fatal: ", 7);
+ write(child_err, msg, len);
+ write(child_err, "\n", 1);
+ exit(128);
+}
+
+static inline void set_cloexec(int fd)
+{
+ int flags = fcntl(fd, F_GETFD);
+ if (flags >= 0)
+ fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
+}
+#endif
+
int start_command(struct child_process *cmd)
{
int need_in, need_out, need_err;
@@ -79,6 +103,17 @@ fail_pipe:
fflush(NULL);
cmd->pid = fork();
if (!cmd->pid) {
+ /*
+ * Redirect the channel to write syscall error messages to
+ * before redirecting the process's stderr so that all die()
+ * in subsequent call paths use the parent's stderr.
+ */
+ if (cmd->no_stderr || need_err) {
+ child_err = dup(2);
+ set_cloexec(child_err);
+ }
+ set_die_routine(die_child);
+
if (cmd->no_stdin)
dup_devnull(0);
else if (need_in) {
@@ -126,9 +161,14 @@ fail_pipe:
} else {
execvp(cmd->argv[0], (char *const*) cmd->argv);
}
- trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
- strerror(errno));
- exit(127);
+ /*
+ * Do not check for cmd->silent_exec_failure; the parent
+ * process will check it when it sees this exit code.
+ */
+ if (errno == ENOENT)
+ exit(127);
+ else
+ die_errno("cannot exec '%s'", cmd->argv[0]);
}
if (cmd->pid < 0)
error("cannot fork() for %s: %s", cmd->argv[0],