threads / patch / 12085

patch, 6 partsAllow run_command stdout_to_stderr when stderr is a pipe

Subject: [PATCH 1/6] Allow run_command stdout_to_stderr when stderr is a pipe

## tl;dr

One message between Feb 14, 2008 and Feb 14, 2008. Diffs are folded; open one to read it.

replies: 0people: 1as markdown or json

Shawn O. Pearce· Feb 14, 2008, 06:22 UTC · lore

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(-)
Show changes to run-command.c +7 −7
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));
-- 
1.5.4.1.1309.g833c2

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