mirror of
https://github.com/sstefani/mtrace.git
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126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
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* This file is part of mtrace.
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* Copyright (C) 2015 Stefani Seibold <stefani@seibold.net>
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*
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* This work was sponsored by Rohde & Schwarz GmbH & Co. KG, Munich/Germany.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* 02110-1301 USA
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <poll.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "common.h"
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#include "ioevent.h"
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struct io_watch_event {
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int (*func)(void);
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};
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struct pollfd *io_watch_poll;
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struct io_watch_event *io_watch_event;
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static unsigned int io_watch_size;
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static unsigned int io_watch_elems;
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static inline void io_watch_set(unsigned int idx, int fd, int (*func)(void))
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{
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io_watch_event[idx].func = func;
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io_watch_poll[idx].fd = fd;
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io_watch_poll[idx].events = POLLIN | POLLPRI | POLLERR | POLLHUP | POLLNVAL;
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}
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int ioevent_add_input(int fd, int (*func)(void))
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{
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unsigned int i;
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for(i = 0; i < io_watch_elems; ++i) {
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if (io_watch_poll[i].fd == fd) {
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io_watch_set(i, fd, func);
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return 1;
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}
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}
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if (io_watch_size == io_watch_elems) {
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io_watch_size += 16;
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io_watch_poll = realloc(io_watch_poll, sizeof(struct pollfd) * io_watch_size);
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io_watch_event = realloc(io_watch_event, sizeof(struct io_watch_event) * io_watch_size);
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}
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io_watch_set(io_watch_elems, fd, func);
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++io_watch_elems;
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return 0;
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}
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int ioevent_del_input(int fd)
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{
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unsigned int i;
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for(i = 0; i < io_watch_elems; ++i) {
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if (io_watch_poll[i].fd == fd) {
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--io_watch_elems;
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if (i != io_watch_elems) {
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io_watch_set(i,
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io_watch_poll[io_watch_elems].fd,
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io_watch_event[io_watch_elems].func
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);
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}
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return 0;
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}
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}
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return -1;
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}
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int ioevent_watch(int timeout)
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{
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unsigned int i;
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int ret;
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ret = TEMP_FAILURE_RETRY(poll(io_watch_poll, io_watch_elems, timeout));
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if (ret < 0)
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return ret;
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ret = 0;
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for(i = 0; i < io_watch_elems; ++i) {
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if (io_watch_poll[i].revents) {
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if (io_watch_event[i].func() == -1)
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ret = -1;
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}
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}
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return ret;
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}
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int ioevent_wait_input(int fd, int timeout)
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{
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struct pollfd pfd[1];
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pfd[0].fd = fd;
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pfd[0].events = POLLIN | POLLPRI | POLLERR | POLLHUP | POLLNVAL;
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return TEMP_FAILURE_RETRY(poll(pfd, ARRAY_SIZE(pfd), timeout));
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}
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