sha1_file.c: introduce get_max_fd_limit() helper
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>
Joachim Schmitz committed
Aug 24, 2012 at 11:52 UTC
a0788266d310dd3f6343c7ee754106784aa1e2af
1 file changed
+19
-7
sha1_file.c
+19
-7
@@ -731,6 +731,24 @@ void free_pack_by_name(const char *pack_name)
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}
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}
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+static unsigned int get_max_fd_limit(void)
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+{
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+#ifdef RLIMIT_NOFILE
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+ struct rlimit lim;
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+
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+ if (getrlimit(RLIMIT_NOFILE, &lim))
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+ die_errno("cannot get RLIMIT_NOFILE");
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+
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+ return lim.rlim_cur;
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+#elif defined(_SC_OPEN_MAX)
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+ return sysconf(_SC_OPEN_MAX);
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+#elif defined(OPEN_MAX)
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+ return OPEN_MAX;
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+#else
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+ return 1; /* see the caller ;-) */
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+#endif
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+}
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+
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/*
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* Do not call this directly as this leaks p->pack_fd on error return;
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* call open_packed_git() instead.
@@ -747,13 +765,7 @@ static int open_packed_git_1(struct packed_git *p)
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return error("packfile %s index unavailable", p->pack_name);
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if (!pack_max_fds) {
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- struct rlimit lim;
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- unsigned int max_fds;
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-
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- if (getrlimit(RLIMIT_NOFILE, &lim))
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- die_errno("cannot get RLIMIT_NOFILE");
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-
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- max_fds = lim.rlim_cur;
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+ unsigned int max_fds = get_max_fd_limit();
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/* Save 3 for stdin/stdout/stderr, 22 for work */
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if (25 < max_fds)