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Makefile
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capsicum_stubs.c
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closefrom.c
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date.sh
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fake_chflags
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fake_sysctl.c
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fflags.c
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fgetln_fallback.c
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fgetwln_fallback.c
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hostname.sh
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include
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local-link.h
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mkimg
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progname.c
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Editing: closefrom.c
/* * Copyright (c) 2004-2005, 2007, 2010, 2012-2014 * Todd C. Miller <Todd.Miller@courtesan.com> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ // #include <config.h> #include <sys/types.h> #include <unistd.h> #include <stdio.h> #ifdef STDC_HEADERS # include <stdlib.h> # include <stddef.h> #else # ifdef HAVE_STDLIB_H # include <stdlib.h> # endif #endif /* STDC_HEADERS */ #include <fcntl.h> #include <limits.h> #ifdef HAVE_PSTAT_GETPROC # include <sys/param.h> # include <sys/pstat.h> #else # ifdef HAVE_DIRENT_H # include <dirent.h> # define NAMLEN(dirent) strlen((dirent)->d_name) # else # define dirent direct # define NAMLEN(dirent) (dirent)->d_namlen # ifdef HAVE_SYS_NDIR_H # include <sys/ndir.h> # endif # ifdef HAVE_SYS_DIR_H # include <sys/dir.h> # endif # ifdef HAVE_NDIR_H # include <ndir.h> # endif # endif #endif #ifndef OPEN_MAX # define OPEN_MAX 256 #endif #if defined(HAVE_FCNTL_CLOSEM) && !defined(HAVE_DIRFD) # define closefrom closefrom_fallback #endif static inline void closefrom_close(int fd) { #ifdef __APPLE__ /* Avoid potential libdispatch crash when we close its fds. */ (void)fcntl(fd, F_SETFD, FD_CLOEXEC); #else (void)close(fd); #endif } /* * Close all file descriptors greater than or equal to lowfd. * This is the expensive (fallback) method. */ void closefrom_fallback(int lowfd) { long fd, maxfd; /* * Fall back on sysconf() or getdtablesize(). We avoid checking * resource limits since it is possible to open a file descriptor * and then drop the rlimit such that it is below the open fd. */ #ifdef HAVE_SYSCONF maxfd = sysconf(_SC_OPEN_MAX); #else maxfd = getdtablesize(); #endif /* HAVE_SYSCONF */ if (maxfd < 0) maxfd = OPEN_MAX; for (fd = lowfd; fd < maxfd; fd++) closefrom_close(fd); } /* * Close all file descriptors greater than or equal to lowfd. * We try the fast way first, falling back on the slow method. */ #if defined(HAVE_FCNTL_CLOSEM) void closefrom(int lowfd) { if (fcntl(lowfd, F_CLOSEM, 0) == -1) closefrom_fallback(lowfd); } #elif defined(HAVE_PSTAT_GETPROC) void closefrom(int lowfd) { struct pst_status pstat; int fd; if (pstat_getproc(&pstat, sizeof(pstat), 0, getpid()) != -1) { for (fd = lowfd; fd <= pstat.pst_highestfd; fd++) (void)close(fd); } else { closefrom_fallback(lowfd); } } #elif defined(HAVE_DIRFD) static int closefrom_procfs(int lowfd) { const char *path; DIR *dirp; struct dirent *dent; int *fd_array = NULL; int fd_array_used = 0; int fd_array_size = 0; int ret = 0; int i; /* Use /proc/self/fd (or /dev/fd on FreeBSD) if it exists. */ # if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__) path = "/dev/fd"; # else path = "/proc/self/fd"; # endif dirp = opendir(path); if (dirp == NULL) return -1; while ((dent = readdir(dirp)) != NULL) { const char *errstr; int fd; fd = strtonum(dent->d_name, lowfd, INT_MAX, &errstr); if (errstr != NULL || fd == dirfd(dirp)) continue; if (fd_array_used >= fd_array_size) { int *ptr; if (fd_array_size > 0) fd_array_size *= 2; else fd_array_size = 32; ptr = reallocarray(fd_array, fd_array_size, sizeof(int)); if (ptr == NULL) { ret = -1; break; } fd_array = ptr; } fd_array[fd_array_used++] = fd; } for (i = 0; i < fd_array_used; i++) closefrom_close(fd_array[i]); free(fd_array); (void)closedir(dirp); return ret; } void closefrom(int lowfd) { if (closefrom_procfs(lowfd) == 0) return; closefrom_fallback(lowfd); } #endif /* HAVE_FCNTL_CLOSEM */
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