67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <hexagram/can.h>
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hexagram_can_if *hexagram_can_if_open(const char *name) {
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hexagram_can_if *can_if;
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if (name == NULL) {
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errno = EINVAL;
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goto error_no_name;
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}
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if ((can_if = malloc(sizeof(*can_if))) == NULL) {
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goto error_malloc;
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}
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if ((can_if->sock = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0) {
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goto error_socket;
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}
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strcpy(can_if->ifr.ifr_name, name);
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if (ioctl(can_if->sock, SIOCGIFINDEX, &can_if->ifr) < 0) {
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goto error_ioctl_siocgifindex;
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}
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can_if->addr.can_family = AF_CAN;
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can_if->addr.can_ifindex = can_if->ifr.ifr_ifindex;
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if (bind(can_if->sock, (struct sockaddr *)&can_if->addr, sizeof(struct sockaddr)) < 0) {
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goto error_bind;
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}
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return can_if;
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error_bind:
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error_ioctl_siocgifindex:
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close(can_if->sock);
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error_socket:
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free(can_if);
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error_malloc:
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error_no_name:
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return NULL;
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}
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void hexagram_can_if_close(hexagram_can_if *can_if) {
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close(can_if->sock);
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free(can_if);
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}
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int hexagram_can_if_read(hexagram_can_if *can_if,
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struct can_frame *frame) {
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return read(can_if->sock, frame, sizeof(*frame));
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}
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int hexagram_can_if_write(hexagram_can_if *can_if,
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struct can_frame *frame) {
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return write(can_if->sock, frame, sizeof(*frame));
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}
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