54 lines
998 B
C
54 lines
998 B
C
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/*
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* Copyright 2023 Google LLC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <nsi_tracing.h>
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#include <string.h>
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#include <unistd.h>
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#include "linux_evdev_bottom.h"
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int linux_evdev_read(int fd, uint16_t *type, uint16_t *code, int32_t *value)
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{
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struct input_event ev;
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int ret;
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ret = read(fd, &ev, sizeof(ev));
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if (ret < 0) {
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if (errno == EAGAIN || errno == EINTR) {
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return NATIVE_LINUX_EVDEV_NO_DATA;
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}
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nsi_print_warning("Read error: %s", strerror(errno));
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return -EIO;
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} else if (ret < sizeof(ev)) {
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nsi_print_warning("Unexpected read size: %d, expecting %d",
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ret, sizeof(ev));
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return -EIO;
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}
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*type = ev.type;
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*code = ev.code;
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*value = ev.value;
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return 0;
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}
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int linux_evdev_open(const char *path)
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{
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int fd;
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fd = open(path, O_RDONLY | O_NONBLOCK);
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if (fd < 0) {
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nsi_print_error_and_exit(
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"Failed to open the evdev device %s: %s\n",
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path, strerror(errno));
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}
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return fd;
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}
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