65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <lockdev.h>
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#define DEVICE_PATH "/dev/"
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int main() {
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struct dirent *entry;
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DIR *dp;
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char device[256];
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int fd;
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dp = opendir(DEVICE_PATH);
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if (dp == NULL) {
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perror("opendir");
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return 1;
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}
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while ((entry = readdir(dp))) {
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if (strncmp(entry->d_name, "ttyS", 4) == 0) {
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snprintf(device, sizeof(device), "%s%s", DEVICE_PATH, entry->d_name);
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break;
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}
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}
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closedir(dp);
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if (entry == NULL) {
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fprintf(stderr, "No tty device found ttyS*\n");
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return 1;
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}
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printf("Device in use: %s\n", device);
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fd = open(device, O_RDWR);
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if (fd == -1) {
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perror("open");
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return 1;
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}
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if (dev_lock(device) == -1) {
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perror("dev_lock");
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close(fd);
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return 1;
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}
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printf("Device is locked.\n");
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if (dev_unlock(device, 0) == -1) {
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perror("dev_unlock");
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close(fd);
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return 1;
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}
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printf("Device is unlocked.\n");
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close(fd);
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return 0;
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}
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