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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Authors: Jeffrey Stedfast <fejj@ximian.com>
*
* Copyright 2003 Ximian, Inc. (www.ximian.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "camel-io.h"
#include "camel-operation.h"
/* FIXME: should we trade out select() for a poll() instead? */
ssize_t
camel_read (int fd, char *buf, size_t n)
{
ssize_t nread;
int cancel_fd;
if (camel_operation_cancel_check (NULL)) {
errno = EINTR;
return -1;
}
cancel_fd = camel_operation_cancel_fd (NULL);
if (cancel_fd == -1) {
do {
nread = read (fd, buf, n);
} while (nread == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
} else {
int errnosav, flags, fdmax;
fd_set rdset;
flags = fcntl (fd, F_GETFL);
fcntl (fd, F_SETFL, flags | O_NONBLOCK);
do {
FD_ZERO (&rdset);
FD_SET (fd, &rdset);
FD_SET (cancel_fd, &rdset);
fdmax = MAX (fd, cancel_fd) + 1;
nread = -1;
if (select (fdmax, &rdset, 0, 0, NULL) != -1) {
if (FD_ISSET (cancel_fd, &rdset)) {
fcntl (fd, F_SETFL, flags);
errno = EINTR;
return -1;
}
do {
nread = read (fd, buf, n);
} while (nread == -1 && errno == EINTR);
} else if (errno == EINTR) {
errno = EAGAIN;
}
} while (nread == -1 && (errno == EAGAIN || errno == EWOULDBLOCK));
errnosav = errno;
fcntl (fd, F_SETFL, flags);
errno = errnosav;
}
return nread;
}
ssize_t
camel_write (int fd, const char *buf, size_t n)
{
ssize_t w, written = 0;
int cancel_fd;
if (camel_operation_cancel_check (NULL)) {
errno = EINTR;
return -1;
}
cancel_fd = camel_operation_cancel_fd (NULL);
if (cancel_fd == -1) {
do {
do {
w = write (fd, buf + written, n - written);
} while (w == -1 && (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK));
if (w > 0)
written += w;
} while (w != -1 && written < n);
} else {
int errnosav, flags, fdmax;
fd_set rdset, wrset;
flags = fcntl (fd, F_GETFL);
fcntl (fd, F_SETFL, flags | O_NONBLOCK);
fdmax = MAX (fd, cancel_fd) + 1;
do {
FD_ZERO (&rdset);
FD_ZERO (&wrset);
FD_SET (fd, &wrset);
FD_SET (cancel_fd, &rdset);
w = -1;
if (select (fdmax, &rdset, &wrset, 0, NULL) != -1) {
if (FD_ISSET (cancel_fd, &rdset)) {
fcntl (fd, F_SETFL, flags);
errno = EINTR;
return -1;
}
do {
w = write (fd, buf + written, n - written);
} while (w == -1 && errno == EINTR);
if (w == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
w = 0;
} else {
errnosav = errno;
fcntl (fd, F_SETFL, flags);
errno = errnosav;
return -1;
}
} else
written += w;
} else if (errno == EINTR) {
w = 0;
}
} while (w != -1 && written < n);
errnosav = errno;
fcntl (fd, F_SETFL, flags);
errno = errnosav;
}
if (w == -1)
return -1;
return written;
}
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