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setup: use xopen and xdup in sanitize_stdfds 

Replace the catch-all error message with specific ones for opening and
duplicating by calling the wrappers xopen and xdup.  The code becomes
easier to follow when error handling is reduced to two letters.

Remove the unnecessary mode parameter while at it -- we expect /dev/null
to already exist.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2021-09-09 23:45:29 +02:00 committed by Junio C Hamano
parent 225bc32a98
commit d9a65b6c0a
1 changed files with 3 additions and 5 deletions
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8
setup.c
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@ -1423,11 +1423,9 @@ const char *resolve_gitdir_gently(const char *suspect, int *return_error_code)
/* if any standard file descriptor is missing open it to /dev/null */
void sanitize_stdfds(void)
{
int fd = open("/dev/null", O_RDWR, 0);
while (fd != -1 && fd < 2)
fd = dup(fd);
if (fd == -1)
die_errno(_("open /dev/null or dup failed"));
int fd = xopen("/dev/null", O_RDWR);
while (fd < 2)
fd = xdup(fd);
if (fd > 2)
close(fd);
}