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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
* Copyright (C) 2002-2010 Marcel Holtmann <marcel@holtmann.org>
*
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#ifndef min
#define min(a,b) ( (a)<(b) ? (a):(b) )
#endif
/* IO cancelation */
extern volatile sig_atomic_t __io_canceled;
static inline void io_init(void)
{
__io_canceled = 0;
}
static inline void io_cancel(void)
{
__io_canceled = 1;
}
/* Read exactly len bytes (Signal safe)*/
static inline int read_n(int fd, char *buf, int len)
{
register int t = 0, w;
while (!__io_canceled && len > 0) {
if ((w = read(fd, buf, len)) < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
return -1;
}
if (!w)
return 0;
len -= w;
buf += w;
t += w;
}
return t;
}
/* Write exactly len bytes (Signal safe)*/
static inline int write_n(int fd, char *buf, int len)
{
register int t = 0, w;
while (!__io_canceled && len > 0) {
if ((w = write(fd, buf, len)) < 0) {
if (errno == EINTR || errno == EAGAIN)
continue;
return -1;
}
if (!w)
return 0;
len -= w;
buf += w;
t += w;
}
return t;
}
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