14e3ff9f09
As described here: http://pubs.opengroup.org/onlinepubs/9699919799/functions/posix_spawn.html And here: http://man7.org/linux/man-pages/man3/posix_spawn.3.html Bug: N/A (but mentioned in my inbox since 2013) Test: ran tests Change-Id: I0b27b2919b660779e3bd8a25fb429527c16dc621
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "private/ErrnoRestorer.h"
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#include "private/ScopedSignalBlocker.h"
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static FILE* __tmpfile_dir(const char* tmp_dir) {
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char* path = NULL;
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if (asprintf(&path, "%s/tmp.XXXXXXXXXX", tmp_dir) == -1) {
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return NULL;
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}
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int fd;
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{
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ScopedSignalBlocker ssb;
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fd = mkstemp(path);
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if (fd == -1) {
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free(path);
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return NULL;
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}
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// Unlink the file now so that it's removed when closed.
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unlink(path);
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free(path);
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// Can we still use the file now it's unlinked?
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// File systems without hard link support won't have the usual Unix semantics.
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struct stat sb;
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int rc = fstat(fd, &sb);
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if (rc == -1) {
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ErrnoRestorer errno_restorer;
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close(fd);
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return NULL;
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}
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}
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// Turn the file descriptor into a FILE*.
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FILE* fp = fdopen(fd, "w+");
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if (fp != NULL) {
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return fp;
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}
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// Failure. Clean up. We already unlinked, so we just need to close.
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ErrnoRestorer errno_restorer;
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close(fd);
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return NULL;
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}
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FILE* tmpfile() {
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// TODO: get this app's temporary directory from the framework ("/data/data/app/cache").
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// $EXTERNAL_STORAGE turns out not to be very useful because it doesn't support hard links.
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// This means we can't do the usual trick of calling unlink before handing the file back.
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FILE* fp = __tmpfile_dir("/data/local/tmp");
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if (fp == NULL) {
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// P_tmpdir is "/tmp/", but POSIX explicitly says that tmpdir(3) should try P_tmpdir before
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// giving up. This is potentially useful for bionic on the host anyway.
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fp = __tmpfile_dir(P_tmpdir);
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}
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return fp;
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}
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__strong_alias(tmpfile64, tmpfile);
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