81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
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/*++
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/* NAME
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/* open_limit 3
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/* SUMMARY
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/* set/get open file limit
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/* SYNOPSIS
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/* #include <iostuff.h>
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/*
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/* int open_limit(int limit)
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/* DESCRIPTION
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/* The \fIopen_limit\fR() routine attempts to change the maximum
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/* number of open files to the specified limit. Specify a null
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/* argument to effect no change. The result is the actual open file
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/* limit for the current process. The number can be smaller or larger
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/* than the requested limit.
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/* DIAGNOSTICS
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/* open_limit() returns -1 in case of problems. The errno
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/* variable gives hints about the nature of the problem.
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System libraries. */
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#include "sys_defs.h"
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <errno.h>
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/* Application-specific. */
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#include "iostuff.h"
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/*
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* 44BSD compatibility.
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*/
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#ifndef RLIMIT_NOFILE
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#ifdef RLIMIT_OFILE
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#define RLIMIT_NOFILE RLIMIT_OFILE
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#endif
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#endif
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/* open_limit - set/query file descriptor limit */
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int open_limit(int limit)
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{
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#ifdef RLIMIT_NOFILE
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struct rlimit rl;
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#endif
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if (limit < 0) {
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errno = EINVAL;
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return (-1);
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}
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#ifdef RLIMIT_NOFILE
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if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
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return (-1);
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if (limit > 0) {
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if (limit > rl.rlim_max)
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rl.rlim_cur = rl.rlim_max;
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else
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rl.rlim_cur = limit;
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if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
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return (-1);
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}
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return (rl.rlim_cur);
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#endif
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#ifndef RLIMIT_NOFILE
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return (getdtablesize());
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#endif
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}
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