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Annotation of embedaddon/tmux/compat/closefrom.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2004-2005 Todd C. Miller <Todd.Miller@courtesan.com>
        !             3:  *
        !             4:  * Permission to use, copy, modify, and distribute this software for any
        !             5:  * purpose with or without fee is hereby granted, provided that the above
        !             6:  * copyright notice and this permission notice appear in all copies.
        !             7:  *
        !             8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !             9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            15:  */
        !            16: 
        !            17: #ifndef HAVE_CLOSEFROM
        !            18: 
        !            19: #include <sys/types.h>
        !            20: #include <sys/param.h>
        !            21: #include <unistd.h>
        !            22: #include <stdio.h>
        !            23: #ifdef HAVE_FCNTL_H
        !            24: # include <fcntl.h>
        !            25: #endif
        !            26: #include <limits.h>
        !            27: #include <stdlib.h>
        !            28: #include <stddef.h>
        !            29: #include <string.h>
        !            30: #include <unistd.h>
        !            31: #ifdef HAVE_DIRENT_H
        !            32: # include <dirent.h>
        !            33: # define NAMLEN(dirent) strlen((dirent)->d_name)
        !            34: #else
        !            35: # define dirent direct
        !            36: # define NAMLEN(dirent) (dirent)->d_namlen
        !            37: # ifdef HAVE_SYS_NDIR_H
        !            38: #  include <sys/ndir.h>
        !            39: # endif
        !            40: # ifdef HAVE_SYS_DIR_H
        !            41: #  include <sys/dir.h>
        !            42: # endif
        !            43: # ifdef HAVE_NDIR_H
        !            44: #  include <ndir.h>
        !            45: # endif
        !            46: #endif
        !            47: 
        !            48: #include "compat.h"
        !            49: 
        !            50: #ifndef OPEN_MAX
        !            51: # define OPEN_MAX      256
        !            52: #endif
        !            53: 
        !            54: #if 0
        !            55: __unused static const char rcsid[] = "$Sudo: closefrom.c,v 1.11 2006/08/17 15:26:54 millert Exp $";
        !            56: #endif /* lint */
        !            57: 
        !            58: /*
        !            59:  * Close all file descriptors greater than or equal to lowfd.
        !            60:  */
        !            61: #ifdef HAVE_FCNTL_CLOSEM
        !            62: void
        !            63: closefrom(int lowfd)
        !            64: {
        !            65:     (void) fcntl(lowfd, F_CLOSEM, 0);
        !            66: }
        !            67: #else
        !            68: void
        !            69: closefrom(int lowfd)
        !            70: {
        !            71:     long fd, maxfd;
        !            72: #if defined(HAVE_DIRFD) && defined(HAVE_PROC_PID)
        !            73:     char fdpath[PATH_MAX], *endp;
        !            74:     struct dirent *dent;
        !            75:     DIR *dirp;
        !            76:     int len;
        !            77: 
        !            78:     /* Check for a /proc/$$/fd directory. */
        !            79:     len = snprintf(fdpath, sizeof(fdpath), "/proc/%ld/fd", (long)getpid());
        !            80:     if (len > 0 && (size_t)len <= sizeof(fdpath) && (dirp = opendir(fdpath))) {
        !            81:        while ((dent = readdir(dirp)) != NULL) {
        !            82:            fd = strtol(dent->d_name, &endp, 10);
        !            83:            if (dent->d_name != endp && *endp == '\0' &&
        !            84:                fd >= 0 && fd < INT_MAX && fd >= lowfd && fd != dirfd(dirp))
        !            85:                (void) close((int) fd);
        !            86:        }
        !            87:        (void) closedir(dirp);
        !            88:     } else
        !            89: #endif
        !            90:     {
        !            91:        /*
        !            92:         * Fall back on sysconf() or getdtablesize().  We avoid checking
        !            93:         * resource limits since it is possible to open a file descriptor
        !            94:         * and then drop the rlimit such that it is below the open fd.
        !            95:         */
        !            96: #ifdef HAVE_SYSCONF
        !            97:        maxfd = sysconf(_SC_OPEN_MAX);
        !            98: #else
        !            99:        maxfd = getdtablesize();
        !           100: #endif /* HAVE_SYSCONF */
        !           101:        if (maxfd < 0)
        !           102:            maxfd = OPEN_MAX;
        !           103: 
        !           104:        for (fd = lowfd; fd < maxfd; fd++)
        !           105:            (void) close((int) fd);
        !           106:     }
        !           107: }
        !           108: #endif /* !HAVE_FCNTL_CLOSEM */
        !           109: #endif /* HAVE_CLOSEFROM */