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| author | Shawn O. Pearce <spearce@spearce.org> | 2007-03-12 18:37:55 (GMT) |
|---|---|---|
| committer | Junio C Hamano <junkio@cox.net> | 2007-03-13 06:40:17 (GMT) |
| commit | e4507ae84ed04c835b66f77195a0549b72f99c39 (patch) | |
| tree | 97b53f2778458c3e053d120d0589bd5a61e60942 /run-command.c | |
| parent | f4bba25bdc0ecb4ac338de81a2a65af487701833 (diff) | |
| download | git-e4507ae84ed04c835b66f77195a0549b72f99c39.zip git-e4507ae84ed04c835b66f77195a0549b72f99c39.tar.gz git-e4507ae84ed04c835b66f77195a0549b72f99c39.tar.bz2 | |
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.c | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/run-command.c b/run-command.c index d20a6ef..eff523e 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); |