mirror of
https://github.com/alsa-project/alsa-utils
synced 2024-11-10 07:55:42 +01:00
257be19c47
The program, axfer, was developed in userspace with glibc-2.28. This
userspace is mostly compliant to POSIX:2008 and some additional macros
for poll event are officially available. The glibc supports them as a
default since its v2.12 release. It will be failed to be compiled with
old glibc or the other libraries for C standard APIs.
One of the purpose of axfer is an better alternative of aplay. In a
point of the purpose, it's preferable to be compiled with the old
libraries.
This commit adds conditional macros to be compiled with libraries for
old compliance level of POSIX.
Reported-by: Jay Foster <jay@systech.com>
Fixes: fce16d9279 ('axfer: add an implementation of waiter for select(2)')
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
//
|
|
// waiter-select.c - Waiter for event notification by select(2).
|
|
//
|
|
// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
|
|
//
|
|
// Licensed under the terms of the GNU General Public License, version 2.
|
|
|
|
#include "waiter.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <sys/select.h>
|
|
|
|
// Except for POLLERR.
|
|
#ifdef POLLRDNORM
|
|
// This program is for userspace compliant to POSIX 2008 (IEEE 1003.1:2008).
|
|
// This is the default compliance level since glibc-2.12 or later.
|
|
# define POLLIN_SET (POLLRDNORM | POLLRDBAND | POLLIN | POLLHUP)
|
|
# define POLLOUT_SET (POLLWRBAND | POLLWRNORM | POLLOUT)
|
|
#else
|
|
// However it's allowed to be for old compliance levels.
|
|
# define POLLIN_SET (POLLIN | POLLHUP)
|
|
# define POLLOUT_SET (POLLOUT)
|
|
#endif
|
|
#define POLLEX_SET (POLLPRI)
|
|
|
|
|
|
struct select_state {
|
|
fd_set rfds_rd;
|
|
fd_set rfds_wr;
|
|
fd_set rfds_ex;
|
|
};
|
|
|
|
static int select_prepare(struct waiter_context *waiter)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int select_wait_event(struct waiter_context *waiter, int timeout_msec)
|
|
{
|
|
struct select_state *state = waiter->private_data;
|
|
struct pollfd *pfd;
|
|
int fd_max;
|
|
struct timeval tv, *tv_ptr;
|
|
int i;
|
|
int err;
|
|
|
|
FD_ZERO(&state->rfds_rd);
|
|
FD_ZERO(&state->rfds_wr);
|
|
FD_ZERO(&state->rfds_ex);
|
|
|
|
fd_max = 0;
|
|
for (i = 0; i < waiter->pfd_count; ++i) {
|
|
pfd = &waiter->pfds[i];
|
|
|
|
if (pfd->events & POLLIN_SET)
|
|
FD_SET(pfd->fd, &state->rfds_rd);
|
|
if (pfd->events & POLLOUT_SET)
|
|
FD_SET(pfd->fd, &state->rfds_wr);
|
|
if (pfd->events & POLLEX_SET)
|
|
FD_SET(pfd->fd, &state->rfds_ex);
|
|
if (pfd->fd > fd_max)
|
|
fd_max = pfd->fd;
|
|
}
|
|
|
|
if (timeout_msec < 0) {
|
|
tv_ptr = NULL;
|
|
} else {
|
|
tv.tv_sec = 0;
|
|
tv.tv_usec = timeout_msec * 1000;
|
|
tv_ptr = &tv;
|
|
}
|
|
|
|
err = select(fd_max + 1, &state->rfds_rd, &state->rfds_wr,
|
|
&state->rfds_ex, tv_ptr);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
for (i = 0; i < waiter->pfd_count; ++i) {
|
|
pfd = &waiter->pfds[i];
|
|
|
|
pfd->revents = 0;
|
|
if (FD_ISSET(pfd->fd, &state->rfds_rd))
|
|
pfd->revents |= POLLIN;
|
|
if (FD_ISSET(pfd->fd, &state->rfds_wr))
|
|
pfd->revents |= POLLOUT;
|
|
if (FD_ISSET(pfd->fd, &state->rfds_ex))
|
|
pfd->revents |= POLLHUP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void select_release(struct waiter_context *waiter)
|
|
{
|
|
return;
|
|
}
|
|
|
|
const struct waiter_data waiter_select = {
|
|
.ops = {
|
|
.prepare = select_prepare,
|
|
.wait_event = select_wait_event,
|
|
.release = select_release,
|
|
},
|
|
.private_size = sizeof(struct select_state),
|
|
};
|