[PATCH v2 2/4] pager: do not close fd 2 unnecessarily
- From
Rubén Justo <rjusto@gmail.com>
- Date
- Jul 13, 2024, 16:29 UTC
- Message-ID
- <fe7c9555-4147-4649-97de-53ef90b552cb@gmail.com>
- In-Reply-To
- <ebcba08f-3fbb-4130-93eb-d0e62bfe0a8a@gmail.com>
We send errors to the pager since 61b80509e3 (sending errors to stdout under $PAGER, 2008-02-16).
In a8335024c2 (pager: do not dup2 stderr if it is already redirected, 2008-12-15) an exception was introduced to avoid redirecting stderr if it is not connected to a terminal.
In such exceptional cases, the close(STDERR_FILENO) we're doing in close_pager_fds, is unnecessary.
Furthermore, in a subsequent commit we're going to introduce changes that will involve using close_pager_fds multiple times.
With this in mind, controlling when we want to close stderr, become sensible.
Let's close(STDERR_FILENO) only when necessary, and pave the way for the upcoming changes.
Signed-off-by: Rubén Justo <rjusto@gmail.com> --- pager.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/pager.c b/pager.c index be6f4ee59f..251adfc2ad 100644 --- a/pager.c +++ b/pager.c @@ -14,6 +14,7 @@ int pager_use_color = 1; static struct child_process pager_process; static char *pager_program; +static int close_fd2; /* Is the value coming back from term_columns() just a guess? */ static int term_columns_guessed; @@ -23,7 +24,8 @@ static void close_pager_fds(void) { /* signal EOF to pager */ close(1); - close(2); + if (close_fd2) + close(2); } static void wait_for_pager_atexit(void) @@ -141,8 +143,10 @@ void setup_pager(void) /* original process continues, but writes to the pipe */ dup2(pager_process.in, 1); - if (isatty(2)) + if (isatty(2)) { + close_fd2 = 1; dup2(pager_process.in, 2); + } close(pager_process.in); /* this makes sure that the parent terminates after the pager */
-- 2.45.2.831.g9e4974e3d4