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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* libiio - Library for interfacing industrial I/O (IIO) devices
*
* Copyright (C) 2021 Analog Devices, Inc.
* Author: Paul Cercueil
*/
#include "debug.h"
#include "iio-config.h"
#include "iio-private.h"
#include "network.h"
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <poll.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <unistd.h>
int set_blocking_mode(int fd, bool blocking)
{
int ret = fcntl(fd, F_GETFL, 0);
if (ret < 0)
return -errno;
if (blocking)
ret &= ~O_NONBLOCK;
else
ret |= O_NONBLOCK;
ret = fcntl(fd, F_SETFL, ret);
return ret < 0 ? -errno : 0;
}
#if WITH_NETWORK_EVENTFD
#include <sys/eventfd.h>
static int create_cancel_fd(struct iiod_client_pdata *io_ctx)
{
io_ctx->cancel_fd[0] = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (io_ctx->cancel_fd[0] < 0)
return -errno;
return 0;
}
#else /* WITH_NETWORK_EVENTFD */
static int create_cancel_fd(struct iiod_client_pdata *io_ctx)
{
int ret;
#ifdef HAS_PIPE2
ret = pipe2(io_ctx->cancel_fd, O_CLOEXEC | O_NONBLOCK);
if (ret < 0 && errno != ENOSYS) /* If ENOSYS try pipe() */
return -errno;
#endif
ret = pipe(io_ctx->cancel_fd);
if (ret < 0)
return -errno;
ret = set_blocking_mode(io_ctx->cancel_fd[0], false);
if (ret < 0)
goto err_close;
ret = set_blocking_mode(io_ctx->cancel_fd[1], false);
if (ret < 0)
goto err_close;
return 0;
err_close:
close(io_ctx->cancel_fd[0]);
close(io_ctx->cancel_fd[1]);
return ret;
}
#endif /* WITH_NETWORK_EVENTFD */
void cleanup_cancel(struct iiod_client_pdata *io_ctx)
{
close(io_ctx->cancel_fd[0]);
if (!WITH_NETWORK_EVENTFD)
close(io_ctx->cancel_fd[1]);
}
int setup_cancel(struct iiod_client_pdata *io_ctx)
{
return create_cancel_fd(io_ctx);
}
#define CANCEL_WR_FD (!WITH_NETWORK_EVENTFD)
void do_cancel(struct iiod_client_pdata *io_ctx)
{
uint64_t event = 1;
int ret;
ret = write(io_ctx->cancel_fd[CANCEL_WR_FD], &event, sizeof(event));
if (ret == -1) {
/* If this happens something went very seriously wrong */
char err_str[1024];
iio_strerror(errno, err_str, sizeof(err_str));
IIO_ERROR("Unable to signal cancellation event: %s\n", err_str);
}
}
int wait_cancellable(struct iiod_client_pdata *io_ctx, bool read)
{
struct pollfd pfd[2];
int ret;
if (!io_ctx->cancellable)
return 0;
memset(pfd, 0, sizeof(pfd));
pfd[0].fd = io_ctx->fd;
if (read)
pfd[0].events = POLLIN;
else
pfd[0].events = POLLOUT;
pfd[1].fd = io_ctx->cancel_fd[0];
pfd[1].events = POLLIN;
do {
int timeout_ms;
if (io_ctx->timeout_ms > 0)
timeout_ms = (int) io_ctx->timeout_ms;
else
timeout_ms = -1;
do {
ret = poll(pfd, 2, timeout_ms);
} while (ret == -1 && errno == EINTR);
if (ret == -1)
return -errno;
if (!ret)
return -EPIPE;
if (pfd[1].revents & POLLIN)
return -EBADF;
} while (!(pfd[0].revents & (pfd[0].events | POLLERR | POLLHUP)));
return 0;
}
int network_get_error(void)
{
return -errno;
}
bool network_should_retry(int err)
{
return err == -EAGAIN;
}
bool network_is_interrupted(int err)
{
return err == -EINTR;
}
bool network_connect_in_progress(int err)
{
return err == -EINPROGRESS;
}
/* Use it if available */
#ifndef SOCK_CLOEXEC
#define SOCK_CLOEXEC 0
#endif
int do_create_socket(const struct addrinfo *addrinfo)
{
int fd;
fd = socket(addrinfo->ai_family, addrinfo->ai_socktype | SOCK_CLOEXEC, 0);
if (fd < 0)
return -errno;
return fd;
}
int set_socket_timeout(int fd, unsigned int timeout)
{
struct timeval tv;
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000;
if (setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0 ||
setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO,
&tv, sizeof(tv)) < 0)
return -errno;
else
return 0;
}
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