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https://git.kernel.org/pub/scm/bluetooth/bluez.git
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87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2002-2010 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <signal.h>
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#ifndef min
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#define min(a,b) ( (a)<(b) ? (a):(b) )
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#endif
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/* IO cancelation */
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extern volatile sig_atomic_t __io_canceled;
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static inline void io_init(void)
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{
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__io_canceled = 0;
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}
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static inline void io_cancel(void)
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{
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__io_canceled = 1;
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}
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/* Read exactly len bytes (Signal safe)*/
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static inline int read_n(int fd, char *buf, int len)
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{
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register int t = 0, w;
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while (!__io_canceled && len > 0) {
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if ((w = read(fd, buf, len)) < 0) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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return -1;
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}
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if (!w)
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return 0;
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len -= w;
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buf += w;
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t += w;
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}
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return t;
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}
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/* Write exactly len bytes (Signal safe)*/
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static inline int write_n(int fd, char *buf, int len)
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{
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register int t = 0, w;
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while (!__io_canceled && len > 0) {
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if ((w = write(fd, buf, len)) < 0) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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return -1;
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}
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if (!w)
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return 0;
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len -= w;
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buf += w;
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t += w;
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}
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return t;
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}
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