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/*-
* 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);
}
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