26 lines
771 B
C
26 lines
771 B
C
#include "./maxfd.h"
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#include <errno.h>
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long mp_open_max (void) {
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long maxfd = 0L;
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/* Try sysconf(_SC_OPEN_MAX) first, as it can be higher than OPEN_MAX.
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* If that fails and the macro isn't defined, we fall back to an educated
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* guess. There's no guarantee that our guess is adequate and the program
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* will die with SIGSEGV if it isn't and the upper boundary is breached. */
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#ifdef _SC_OPEN_MAX
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errno = 0;
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if ((maxfd = sysconf (_SC_OPEN_MAX)) < 0) {
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if (errno == 0)
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maxfd = DEFAULT_MAXFD; /* it's indeterminate */
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else
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die (STATE_UNKNOWN, _("sysconf error for _SC_OPEN_MAX\n"));
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}
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#elif defined(OPEN_MAX)
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return OPEN_MAX
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#else /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
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return DEFAULT_MAXFD;
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#endif
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return(maxfd);
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}
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