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/* $OpenBSD: imsg_subr.c,v 1.1 2015/07/21 04:06:04 yasuoka Exp $ */ |
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/* |
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* Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/queue.h> |
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#include <sys/uio.h> |
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#include <imsg.h> |
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#include <stdarg.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <poll.h> |
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#include <errno.h> |
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#include "imsg_subr.h" |
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/* |
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* Check readability not to spin before calling imsg_read(3). Wait 'millisec' |
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* until it becomes readable. |
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*/ |
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int |
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imsg_sync_read(struct imsgbuf *ibuf, int millisec) |
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{ |
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struct pollfd fds[1]; |
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int retval; |
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fds[0].fd = ibuf->fd; |
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fds[0].events = POLLIN; |
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retval = poll(fds, 1, millisec); |
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if (retval == 0) { |
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errno = EAGAIN; |
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return (-1); |
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} |
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if (retval > 0 && (fds[0].revents & POLLIN) != 0) |
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return imsg_read(ibuf); |
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return (-1); |
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} |
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/* |
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* Check writability not to spin before calling imsg_flush(3). Wait 'millisec' |
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* until it becomes writable. |
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*/ |
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int |
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imsg_sync_flush(struct imsgbuf *ibuf, int millisec) |
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{ |
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struct pollfd fds[1]; |
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int retval; |
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if (!ibuf->w.queued) |
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return (0); /* already flushed */ |
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fds[0].fd = ibuf->fd; |
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fds[0].events = POLLOUT; |
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retval = poll(fds, 1, millisec); |
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if (retval == 0) { |
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errno = EAGAIN; |
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return (-1); |
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} |
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if (retval > 0 && (fds[0].revents & POLLOUT) != 0) |
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return imsg_flush(ibuf); |
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return (-1); |
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} |