| /*- |
| * Copyright (c) 1990, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Chris Torek. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "private/ErrnoRestorer.h" |
| |
| static FILE* __fd_to_fp(int fd) { |
| FILE* fp = fdopen(fd, "w+"); |
| if (fp != nullptr) return fp; |
| |
| ErrnoRestorer errno_restorer; |
| close(fd); |
| return nullptr; |
| } |
| |
| static FILE* __tmpfile_dir_legacy(const char* tmp_dir) { |
| char* path = nullptr; |
| if (asprintf(&path, "%s/tmp.XXXXXXXXXX", tmp_dir) == -1) { |
| return nullptr; |
| } |
| |
| int fd = mkstemp(path); |
| if (fd == -1) { |
| free(path); |
| return nullptr; |
| } |
| |
| // Unlink the file now so that it's removed when closed. |
| unlink(path); |
| free(path); |
| |
| // Can we still use the file now it's unlinked? |
| // File systems without hard link support won't have the usual Unix semantics. |
| struct stat sb; |
| if (fstat(fd, &sb) == -1) { |
| ErrnoRestorer errno_restorer; |
| close(fd); |
| return nullptr; |
| } |
| |
| return __fd_to_fp(fd); |
| } |
| |
| static FILE* __tmpfile_dir(const char* tmp_dir) { |
| int fd = open(tmp_dir, O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR); |
| if (fd == -1) return __tmpfile_dir_legacy(tmp_dir); |
| return __fd_to_fp(fd); |
| } |
| |
| FILE* tmpfile() { |
| // TODO: get this app's temporary directory from the framework ("/data/data/app/cache"). |
| |
| // $EXTERNAL_STORAGE turns out not to be very useful because it doesn't support hard links. |
| // This means we can't do the usual trick of calling unlink before handing the file back. |
| |
| FILE* fp = __tmpfile_dir("/data/local/tmp"); |
| if (fp == nullptr) { |
| // P_tmpdir is "/tmp/", but POSIX explicitly says that tmpdir(3) should try P_tmpdir before |
| // giving up. This is potentially useful for bionic on the host anyway. |
| fp = __tmpfile_dir(P_tmpdir); |
| } |
| return fp; |
| } |
| __strong_alias(tmpfile64, tmpfile); |
| |
| char* tempnam(const char* dir, const char* prefix) { |
| // This function is a terrible idea, marked deprecated in our headers, |
| // and marked obsolescent by POSIX.1-2008, but we make some effort anyway |
| // since we can't easily remove it... |
| |
| // $TMPDIR overrides any directory passed in. |
| char* tmpdir = getenv("TMPDIR"); |
| if (tmpdir != nullptr) dir = tmpdir; |
| |
| // If we still have no directory, we'll give you a default. |
| // It's useless for apps, but good enough for the shell. |
| if (dir == nullptr) dir = "/data/local/tmp"; |
| |
| // Default prefix? |
| if (prefix == nullptr) prefix = "tempnam."; |
| |
| // Make up a mktemp(3) template and defer to it for the real work. |
| char* path = nullptr; |
| if (asprintf(&path, "%s/%sXXXXXXXXXX", dir, prefix) == -1) return nullptr; |
| if (mktemp(path) == nullptr) { |
| free(path); |
| return nullptr; |
| } |
| return path; |
| } |
| |
| char* tmpnam(char* s) { |
| // This function is a terrible idea, marked deprecated in our headers, |
| // and marked obsolescent by POSIX-1.2008, but we make some effort anyway |
| // since we can't easily remove it... |
| |
| // Default buffer? |
| static char buf[L_tmpnam]; |
| if (s == nullptr) s = buf; |
| |
| // Use $TMPDIR if set, or fall back to /data/local/tmp otherwise. |
| // Useless for apps, but good enough for the shell. |
| const char* dir = getenv("TMPDIR"); |
| if (dir == nullptr) dir = "/data/local/tmp"; |
| |
| // Make up a mktemp(3) template and defer to it for the real work. |
| snprintf(s, L_tmpnam, "%s/tmpnam.XXXXXXXXXX", dir); |
| return mktemp(s); |
| } |