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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#pragma weak closefrom = _closefrom
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#pragma weak fdwalk = _fdwalk
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#include "synonyms.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <limits.h>
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#include <errno.h>
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#include <alloca.h>
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#include <sys/resource.h>
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/* Initial size of the open file descriptor array */
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#define FDS_SZ (1024 * sizeof (int))
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/*
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* Iterate over all open file descriptors, calling 'func' on each one.
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* Terminate the iteration when 'func' returns non-zero or when all
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* open file descriptors have been processed. Return the value of
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* the last non-zero return from 'func' or zero.
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*/
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int
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fdwalk(int (*func)(void *, int), void *cd)
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{
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int err = errno;
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int rv = 0;
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int max_fds = INT_MAX;
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struct rlimit rl;
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DIR *dirp;
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struct dirent *dp;
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int *fds;
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size_t fds_sz;
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int nfds;
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int i;
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nfds = 0;
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fds = alloca(FDS_SZ);
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fds_sz = FDS_SZ;
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if ((dirp = opendir("/proc/self/fd")) != NULL) {
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/*
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* Collect all of the open file descriptors and close
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* the directory before calling 'func' on any of them.
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*/
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while ((dp = readdir(dirp)) != NULL) {
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/* skip '.', '..' and the opendir() fd */
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if (!isdigit(dp->d_name[0]) ||
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(i = atoi(dp->d_name)) == dirp->dd_fd)
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continue;
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if (fds_sz <= nfds * sizeof (int)) {
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fds = memcpy(alloca(fds_sz * 2), fds, fds_sz);
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fds_sz *= 2;
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}
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fds[nfds++] = i;
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}
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(void) closedir(dirp);
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} else {
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/*
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* We could not open the /proc file descriptor directory.
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* We have to do it the hard way.
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*/
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if (getrlimit(RLIMIT_NOFILE, &rl) == 0)
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max_fds = (rl.rlim_max == RLIM_INFINITY)?
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INT_MAX : rl.rlim_max;
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for (i = 0; i < max_fds; i++) {
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if (fcntl(i, F_GETFD) < 0)
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continue;
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if (fds_sz <= nfds * sizeof (int)) {
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fds = memcpy(alloca(fds_sz * 2), fds, fds_sz);
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fds_sz *= 2;
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}
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fds[nfds++] = i;
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}
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}
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/*
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* Restore the original value of errno so that
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* the caller sees only the value of errno set
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* by the callback function.
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*/
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errno = err;
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/*
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* Perform the callbacks on all of the open files.
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*/
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for (i = 0; i < nfds; i++)
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if ((rv = func(cd, fds[i])) != 0)
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break;
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return (rv);
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}
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/*
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* Call-back function for closefrom(), below.
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*/
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static int
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void_close(void *lowp, int fd)
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{
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if (fd >= *(int *)lowp)
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(void) close(fd);
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return (0);
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}
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/*
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* Close all open file descriptors greater than or equal to lowfd.
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*/
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void
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closefrom(int lowfd)
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{
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int low = (lowfd < 0)? 0 : lowfd;
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/*
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* Close lowfd right away as a hedge against failing
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* to open the /proc file descriptor directory due
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* all file descriptors being currently used up.
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*/
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(void) close(low++);
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(void) fdwalk(void_close, &low);
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}
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