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/*
* Copyright (c) 2015 DeNA Co., Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <fcntl.h>
#include "cloexec.h"
pthread_mutex_t cloexec_mutex = PTHREAD_MUTEX_INITIALIZER;
static int set_cloexec(int fd)
{
return fcntl(fd, F_SETFD, FD_CLOEXEC) != -1 ? 0 : -1;
}
/*
* note: the socket must be in non-blocking mode, or the call might block while the mutex is being locked
*/
int cloexec_accept(int socket, struct sockaddr *addr, socklen_t *addrlen)
{
int fd = -1;
pthread_mutex_lock(&cloexec_mutex);
if ((fd = accept(socket, addr, addrlen)) == -1)
goto Exit;
if (set_cloexec(fd) != 0) {
close(fd);
fd = -1;
goto Exit;
}
Exit:
pthread_mutex_unlock(&cloexec_mutex);
return fd;
}
int cloexec_pipe(int fds[2])
{
#ifdef __linux__
return pipe2(fds, O_CLOEXEC);
#else
int ret = -1;
pthread_mutex_lock(&cloexec_mutex);
if (pipe(fds) != 0)
goto Exit;
if (set_cloexec(fds[0]) != 0 || set_cloexec(fds[1]) != 0)
goto Exit;
ret = 0;
Exit:
pthread_mutex_unlock(&cloexec_mutex);
return ret;
#endif
}
int cloexec_socket(int domain, int type, int protocol)
{
#ifdef __linux__
return socket(domain, type | SOCK_CLOEXEC, protocol);
#else
int fd = -1;
pthread_mutex_lock(&cloexec_mutex);
if ((fd = socket(domain, type, protocol)) == -1)
goto Exit;
if (set_cloexec(fd) != 0) {
close(fd);
fd = -1;
goto Exit;
}
Exit:
pthread_mutex_unlock(&cloexec_mutex);
return fd;
#endif
}
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