mirror of https://github.com/nirenjan/libx52.git
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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* Saitek X52 Pro MFD & LED driver - Client communication library
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*
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* Copyright (C) 2021 Nirenjan Krishnan (nirenjan@nirenjan.org)
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*
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* SPDX-License-Identifier: GPL-2.0-only WITH Classpath-exception-2.0
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*/
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#include "config.h"
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "x52dcomm.h"
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#include "x52dcomm-internal.h"
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int x52d_dial_command(const char *sock_path)
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{
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int sock;
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int len;
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struct sockaddr_un remote;
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int saved_errno;
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len = x52d_setup_command_sock(sock_path, &remote);
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if (len < 0) {
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/* Error when setting up sockaddr */
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return -1;
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}
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/* Create a socket */
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock == -1) {
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/* Failure creating the socket, abort early */
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return -1;
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}
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/* Connect to the socket */
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if (connect(sock, (struct sockaddr *)&remote, (socklen_t)len) == -1) {
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/* Failure connecting to the socket. Cleanup */
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saved_errno = errno;
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/* close may modify errno, so we save it prior to the call */
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close(sock);
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sock = -1;
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errno = saved_errno;
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}
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return sock;
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}
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int x52d_send_command(int sock_fd, char *buffer, size_t bufin, size_t bufout)
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{
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int rc;
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for (;;) {
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/*
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* Unix sockets should have sufficient capacity to send the full
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* datagram in a single message. Assume that is the case.
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*/
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rc = send(sock_fd, buffer, bufin, 0);
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if (rc < 0) {
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// Error
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if (errno == EINTR) {
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// System call interrupted due to signal. Try again
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continue;
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} else {
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// Failed. Return early
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return -1;
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}
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}
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break;
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}
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/* Wait till we get a response */
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for (;;) {
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rc = recv(sock_fd, buffer, bufout, 0);
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if (rc < 0) {
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// Error
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if (errno == EINTR) {
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// System call interrupted due to signal. Try again
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continue;
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} else {
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// Failed. Return early
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return -1;
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}
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}
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break;
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}
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return rc;
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}
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