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run-command: Redirect stderr to a pipe before redirecting stdout to stderr

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With this patch, in the 'start_command' function after forking
we now take care of stderr in the child process before stdout.

This way if 'start_command' is called with a 'child_process'
argument like this:

	.err = -1;
	.stdout_to_stderr = 1;

then stderr will be redirected to a pipe before stdout is
redirected to stderr. So we can now get the process' stdout
from the pipe (as well as its stderr).

Earlier such a call would have redirected stdout to stderr
before stderr was itself redirected, and therefore stdout
would not have followed stderr, which would not have been
very useful anyway.

Update documentation in 'api-run-command.txt' accordingly.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Acked-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Christian Couder 2008-03-05 08:35:16 +01:00 committed by Junio C Hamano
parent c95b3ad9ea
commit ce2cf27adc
2 changed files with 11 additions and 10 deletions
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7
Documentation/technical/api-run-command.txt
View file

@ -111,9 +111,10 @@ stderr as follows:
.no_stdin, .no_stdout, .no_stderr: The respective channel is
redirected to /dev/null.
.stdout_to_stderr: stdout of the child is redirected to the
parent's stderr (i.e. *not* to what .err or
.no_stderr specify).
.stdout_to_stderr: stdout of the child is redirected to its
stderr. This happens after stderr is itself redirected.
So stdout will follow stderr to wherever it is
redirected.
To modify the environment of the sub-process, specify an array of
string pointers (NULL terminated) in .env:

14
run-command.c
View file

@ -91,6 +91,13 @@ 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)
@ -103,13 +110,6 @@ 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));