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/* io-unix.c - non-blocking io primitives for unix
*
* Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 or later as
* published by the Free Software Foundation.
*
* See http://www.gnu.org/ for details.
*/
int tf_open(struct tf_fd *fd, const char *pathname, int flags)
{
int kfd, r;
kfd = open(pathname, flags | O_CLOEXEC | O_NONBLOCK);
if (unlikely(kfd < 0))
return -errno;
r = tf_fd_init(fd, kfd, TF_FD_AUTOCLOSE | TF_FD_STREAM_ORIENTED);
if (r < 0) {
close(kfd);
return r;
}
return 0;
}
int tf_open_fd(struct tf_fd *fd, int kfd)
{
int mode, flags = 0;
mode = fcntl(kfd, F_GETFL, 0);
if (!(mode & O_NONBLOCK)) {
fcntl(fd->fd, F_SETFL, mode | O_NONBLOCK);
flags |= TF_FD_RESTORE_BLOCKING;
}
return tf_fd_init(fd, kfd, TF_FD_STREAM_ORIENTED | flags);
}
int tf_close(struct tf_fd *fd)
{
int r;
if (fd->flags & TF_FD_RESTORE_BLOCKING) {
fcntl(fd->fd, F_SETFL, fcntl(fd->fd, F_GETFL, 0) & ~O_NONBLOCK);
}
if (fd->flags & TF_FD_AUTOCLOSE) {
r = close(fd->fd);
if (unlikely(r == -1))
return -errno;
}
return 0;
}
int tf_read(struct tf_fd *fd, void *buf, size_t count, tf_mtime_diff_t timeout)
{
ssize_t n;
int r, mode;
mode = tf_schedule_timeout(timeout);
tf_fd_wait(fd, EPOLLIN);
do {
n = read(fd->fd, buf, count);
if (n == count) {
r = 0;
break;
}
if (n < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
r = errno;
break;
}
} else if (n == 0) {
r = EIO;
break;
} else {
buf += n;
count -= n;
if (!(fd->flags & TF_FD_STREAM_ORIENTED))
continue;
}
r = tf_schedule(mode);
if (r != TF_WAKEUP_FD)
break;
} while (1);
tf_fd_release(fd);
return -r;
}
int tf_write(struct tf_fd *fd, const void *buf, size_t count,
tf_mtime_diff_t timeout)
{
ssize_t n;
int r, mode;
mode = tf_schedule_timeout(timeout);
tf_fd_wait(fd, EPOLLOUT);
do {
n = write(fd->fd, buf, count);
if (n == count) {
r = 0;
break;
}
if (n < 0) {
if (errno == EINTR)
continue;
if (errno != EAGAIN) {
r = errno;
break;
}
} else {
buf += n;
count -= n;
if (!(fd->flags & TF_FD_STREAM_ORIENTED))
continue;
}
r = tf_schedule(mode);
if (r != TF_WAKEUP_FD)
break;
} while (1);
tf_fd_release(fd);
return -r;
}
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