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authorShawn O. Pearce <spearce@spearce.org>2007-03-12 14:37:55 -0400
committerJunio C Hamano <junkio@cox.net>2007-03-12 23:40:17 -0700
commite4507ae84ed04c835b66f77195a0549b72f99c39 (patch)
tree97b53f2778458c3e053d120d0589bd5a61e60942 /run-command.c
parentf4bba25bdc0ecb4ac338de81a2a65af487701833 (diff)
downloadgit-e4507ae84ed04c835b66f77195a0549b72f99c39.tar.gz
git-e4507ae84ed04c835b66f77195a0549b72f99c39.tar.xz
Teach run-command to redirect stdout to /dev/null
Some run-command callers may wish to just discard any data that is sent to stdout from the child. This is a lot like our existing no_stdin support, we just open /dev/null and duplicate the descriptor into position. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'run-command.c')
-rw-r--r--run-command.c26
1 files changed, 18 insertions, 8 deletions
diff --git a/run-command.c b/run-command.c
index d20a6ef80..eff523e19 100644
--- a/run-command.c
+++ b/run-command.c
@@ -8,12 +8,19 @@ static inline void close_pair(int fd[2])
close(fd[1]);
}
+static inline void dup_devnull(int to)
+{
+ int fd = open("/dev/null", O_RDWR);
+ dup2(fd, to);
+ close(fd);
+}
+
int start_command(struct child_process *cmd)
{
- int need_in = !cmd->no_stdin && cmd->in < 0;
- int need_out = !cmd->stdout_to_stderr && cmd->out < 0;
+ int need_in, need_out;
int fdin[2], fdout[2];
+ need_in = !cmd->no_stdin && cmd->in < 0;
if (need_in) {
if (pipe(fdin) < 0)
return -ERR_RUN_COMMAND_PIPE;
@@ -21,6 +28,9 @@ int start_command(struct child_process *cmd)
cmd->close_in = 1;
}
+ need_out = !cmd->no_stdout
+ && !cmd->stdout_to_stderr
+ && cmd->out < 0;
if (need_out) {
if (pipe(fdout) < 0) {
if (need_in)
@@ -41,11 +51,9 @@ int start_command(struct child_process *cmd)
}
if (!cmd->pid) {
- if (cmd->no_stdin) {
- int fd = open("/dev/null", O_RDWR);
- dup2(fd, 0);
- close(fd);
- } else if (need_in) {
+ if (cmd->no_stdin)
+ dup_devnull(0);
+ else if (need_in) {
dup2(fdin[0], 0);
close_pair(fdin);
} else if (cmd->in) {
@@ -53,7 +61,9 @@ int start_command(struct child_process *cmd)
close(cmd->in);
}
- if (cmd->stdout_to_stderr)
+ if (cmd->no_stdout)
+ dup_devnull(1);
+ else if (cmd->stdout_to_stderr)
dup2(2, 1);
else if (need_out) {
dup2(fdout[1], 1);