# [PATCH 2/7] Allow run_command stdout_to_stderr when stderr is a pipe

1 messages from 2008-01-30 to 2008-01-30. Participants: Shawn O. Pearce.
Thread: https://gitlist.dev/t/11793

## Shawn O. Pearce, 2008-01-30 06:22

Subject: [PATCH 2/7] Allow run_command stdout_to_stderr when stderr is a pipe
Message-ID: <20080130062200.GB15838@spearce.org>
URL: https://gitlist.dev/e/20080130062200.GB15838%40spearce.org

```
To allow receive-pack hooks to have their stdout and stderr streams
redirected to the same pipe we need to setup the pipe on fd 2 before
we dup fd 2 over to fd 1.  This way we can use a single pipe to
capture both stdout and stderr and redirect it to a sideband channel,
or elsewhere.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 run-command.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/run-command.c b/run-command.c
index 476d00c..52f80be 100644
--- a/run-command.c
+++ b/run-command.c
@@ -75,6 +75,13 @@ int start_command(struct child_process *cmd)
 			close(cmd->in);
 		}
 
+		if (cmd->no_stderr)
+			dup_devnull(2);
+		else if (need_err) {
+			dup2(fderr[1], 2);
+			close_pair(fderr);
+		}
+
 		if (cmd->no_stdout)
 			dup_devnull(1);
 		else if (cmd->stdout_to_stderr)
@@ -87,13 +94,6 @@ int start_command(struct child_process *cmd)
 			close(cmd->out);
 		}
 
-		if (cmd->no_stderr)
-			dup_devnull(2);
-		else if (need_err) {
-			dup2(fderr[1], 2);
-			close_pair(fderr);
-		}
-
 		if (cmd->dir && chdir(cmd->dir))
 			die("exec %s: cd to %s failed (%s)", cmd->argv[0],
 			    cmd->dir, strerror(errno));
-- 
1.5.4.rc5.1126.g6ba14

```