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/*
* libusual - Utility library for C
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or 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.
*/
/*
* Wrappers around regular I/O functions (send/recv/read/write)
* that survive EINTR and also can log problems.
*/
#include <usual/safeio.h>
#include <usual/socket.h>
#include <usual/logging.h>
#include <usual/string.h>
#include <usual/time.h>
int safe_read(int fd, void *buf, int len)
{
int res;
loop:
res = read(fd, buf, len);
if (res < 0 && errno == EINTR)
goto loop;
return res;
}
int safe_write(int fd, const void *buf, int len)
{
int res;
loop:
res = write(fd, buf, len);
if (res < 0 && errno == EINTR)
goto loop;
return res;
}
int safe_recv(int fd, void *buf, int len, int flags)
{
int res;
char ebuf[128];
loop:
res = recv(fd, buf, len, flags);
if (res < 0 && errno == EINTR)
goto loop;
if (res < 0)
log_noise("safe_recv(%d, %d) = %s", fd, len,
strerror_r(errno, ebuf, sizeof(ebuf)));
else if (cf_verbose > 2)
log_noise("safe_recv(%d, %d) = %d", fd, len, res);
return res;
}
int safe_send(int fd, const void *buf, int len, int flags)
{
int res;
char ebuf[128];
loop:
res = send(fd, buf, len, flags);
if (res < 0 && errno == EINTR)
goto loop;
if (res < 0)
log_noise("safe_send(%d, %d) = %s", fd, len,
strerror_r(errno, ebuf, sizeof(ebuf)));
else if (cf_verbose > 2)
log_noise("safe_send(%d, %d) = %d", fd, len, res);
return res;
}
int safe_close(int fd)
{
int res;
#ifndef WIN32
/*
* POSIX says close() can return EINTR but fd state is "undefined"
* later. Seems Linux and BSDs close the fd anyway and EINTR is
* simply informative. Thus retry is dangerous.
*/
res = close(fd);
#else
/*
* Seems on windows it can returns proper EINTR but only when
* WSACancelBlockingCall() is called. As we don't do it,
* ignore EINTR on win32 too.
*/
res = closesocket(fd);
#endif
if (res < 0) {
char ebuf[128];
log_warning("safe_close(%d) = %s", fd,
strerror_r(errno, ebuf, sizeof(ebuf)));
} else if (cf_verbose > 2) {
log_noise("safe_close(%d) = %d", fd, res);
}
/* ignore EINTR */
if (res < 0 && errno == EINTR)
return 0;
return res;
}
int safe_recvmsg(int fd, struct msghdr *msg, int flags)
{
int res;
char ebuf[128];
loop:
res = recvmsg(fd, msg, flags);
if (res < 0 && errno == EINTR)
goto loop;
if (res < 0)
log_warning("safe_recvmsg(%d, msg, %d) = %s", fd, flags,
strerror_r(errno, ebuf, sizeof(ebuf)));
else if (cf_verbose > 2)
log_noise("safe_recvmsg(%d, msg, %d) = %d", fd, flags, res);
return res;
}
int safe_sendmsg(int fd, const struct msghdr *msg, int flags)
{
int res;
int msgerr_count = 0;
char ebuf[128];
loop:
res = sendmsg(fd, msg, flags);
if (res < 0 && errno == EINTR)
goto loop;
if (res < 0) {
log_warning("safe_sendmsg(%d, msg[%d,%d], %d) = %s", fd,
(int)msg->msg_iov[0].iov_len,
(int)msg->msg_controllen,
flags, strerror_r(errno, ebuf, sizeof(ebuf)));
/* with ancillary data on blocking socket OSX returns
* EMSGSIZE instead of blocking. try to solve it by waiting */
if (errno == EMSGSIZE && msgerr_count < 20) {
struct timeval tv = {1, 0};
log_warning("trying to sleep a bit");
select(0, NULL, NULL, NULL, &tv);
msgerr_count++;
goto loop;
}
} else if (cf_verbose > 2)
log_noise("safe_sendmsg(%d, msg, %d) = %d", fd, flags, res);
return res;
}
int safe_connect(int fd, const struct sockaddr *sa, socklen_t sa_len)
{
int res;
char buf[128];
char ebuf[128];
loop:
res = connect(fd, sa, sa_len);
if (res < 0 && errno == EINTR)
goto loop;
if (res < 0 && (errno != EINPROGRESS || cf_verbose > 2))
log_noise("connect(%d, %s) = %s", fd,
sa2str(sa, buf, sizeof(buf)),
strerror_r(errno, ebuf, sizeof(ebuf)));
else if (cf_verbose > 2)
log_noise("connect(%d, %s) = %d", fd, sa2str(sa, buf, sizeof(buf)), res);
return res;
}
int safe_accept(int fd, struct sockaddr *sa, socklen_t *sa_len_p)
{
int res;
char buf[128];
char ebuf[128];
loop:
res = accept(fd, sa, sa_len_p);
if (res < 0 && errno == EINTR)
goto loop;
if (res < 0)
log_noise("safe_accept(%d) = %s", fd,
strerror_r(errno, ebuf, sizeof(ebuf)));
else if (cf_verbose > 2)
log_noise("safe_accept(%d) = %d (%s)", fd, res, sa2str(sa, buf, sizeof(buf)));
return res;
}
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