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sha1_file.c: introduce get_max_fd_limit() helper

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Not all platforms have getrlimit(), but there are other ways to see
the maximum number of files that a process can have open.  If
getrlimit() is unavailable, fall back to sysconf(_SC_OPEN_MAX) if
available, and use OPEN_MAX from <limits.h>.

Signed-off-by: Joachim Schmitz <jojo@schmitz-digital.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Joachim Schmitz 2012-08-24 11:52:22 +02:00 committed by Junio C Hamano
parent fab4b04e4b
commit a0788266d3
1 changed files with 19 additions and 7 deletions
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26
sha1_file.c
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@ -731,6 +731,24 @@ void free_pack_by_name(const char *pack_name)
}
}
static unsigned int get_max_fd_limit(void)
{
#ifdef RLIMIT_NOFILE
struct rlimit lim;
if (getrlimit(RLIMIT_NOFILE, &lim))
die_errno("cannot get RLIMIT_NOFILE");
return lim.rlim_cur;
#elif defined(_SC_OPEN_MAX)
return sysconf(_SC_OPEN_MAX);
#elif defined(OPEN_MAX)
return OPEN_MAX;
#else
return 1; /* see the caller ;-) */
#endif
}
/*
* Do not call this directly as this leaks p->pack_fd on error return;
* call open_packed_git() instead.
@ -747,13 +765,7 @@ static int open_packed_git_1(struct packed_git *p)
return error("packfile %s index unavailable", p->pack_name);
if (!pack_max_fds) {
struct rlimit lim;
unsigned int max_fds;
if (getrlimit(RLIMIT_NOFILE, &lim))
die_errno("cannot get RLIMIT_NOFILE");
max_fds = lim.rlim_cur;
unsigned int max_fds = get_max_fd_limit();
/* Save 3 for stdin/stdout/stderr, 22 for work */
if (25 < max_fds)