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47 lines
1.5 KiB
47 lines
1.5 KiB
2 years ago
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// Copyright(C) 1999-2021, 2023 National Technology & Engineering Solutions
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// of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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// NTESS, the U.S. Government retains certain rights in this software.
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//
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// See packages/seacas/LICENSE for details
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#if defined(WIN32) || defined(__WIN32__) || defined(_WIN32) || defined(_MSC_VER) || \
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defined(__MINGW32__) || defined(_WIN64) || defined(__MINGW64__)
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#include <stdio.h>
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#else
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#include <limits.h>
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#include <unistd.h>
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#endif
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int open_file_limit(void)
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{
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// Returns maximum number of files that one process can have open
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// at one time. (POSIX)
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#if defined(WIN32) || defined(__WIN32__) || defined(_WIN32) || defined(_MSC_VER) || \
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defined(__MINGW32__) || defined(_WIN64) || defined(__MINGW64__)
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int fdmax = _getmaxstdio();
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#else
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int fdmax = sysconf(_SC_OPEN_MAX);
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if (fdmax == -1) {
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// POSIX indication that there is no limit on open files...
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fdmax = INT_MAX;
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}
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#endif
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// File descriptors are assigned in order (0,1,2,3,...) on a per-process
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// basis.
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// Assume that we have stdin, stdout, stderr.
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// (3 total).
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return fdmax - 3;
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// Could iterate from 0..fdmax and check for the first EBADF (bad
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// file descriptor) error return from fcntl, but that takes too long
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// and may cause other problems.
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//
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// Another possibility is to do an open and see which descriptor is
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// returned -- take that as 1 more than the current count of open
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// files instead of assuming 3.
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//
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}
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