From ccf08bc3d06050fbe9b76846f6e2ab6d1cd6bd09 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Tue, 22 Jul 2008 03:12:46 -0400
Subject: [PATCH] run-command: add pre-exec callback
This is a function provided by the caller which is called
_after_ the process is forked, but before the spawned
program is executed. On platforms (like mingw) where
subprocesses are forked and executed in a single call, the
preexec callback is simply ignored.
This will be used in the following patch to do some setup
for 'less' that must happen in the forked child.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
run-command.c | 2 ++
run-command.h | 1 +
2 files changed, 3 insertions(+)
diff --git a/run-command.c b/run-command.c
index 6e29fdf9e2..73d0c31276 100644
--- a/run-command.c
+++ b/run-command.c
@@ -110,6 +110,8 @@ int start_command(struct child_process *cmd)
unsetenv(*cmd->env);
}
}
+ if (cmd->preexec_cb)
+ cmd->preexec_cb();
if (cmd->git_cmd) {
execv_git_cmd(cmd->argv);
} else {
diff --git a/run-command.h b/run-command.h
index 5203a9ebb1..4f2b7d7d40 100644
--- a/run-command.h
+++ b/run-command.h
@@ -42,6 +42,7 @@ struct child_process {
unsigned no_stderr:1;
unsigned git_cmd:1; /* if this is to be git sub-command */
unsigned stdout_to_stderr:1;
+ void (*preexec_cb)(void);
};
int start_command(struct child_process *);