Add basic tools

2026-10-18 18:27:34 +02:00
parent b567d8539c
commit b6ffd2c8c6
12 changed files with 638 additions and 0 deletions
@@ -0,0 +1,42 @@
+#define _GNU_SOURCE
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+int main(int argc, char** argv) {
+    if (argc < 3) {
+        fprintf(stderr, "usage: %s <tty> <command> [args...]\n", argv[0]);
+        return 2;
+    }
+
+    const char* tty = argv[1];
+
+    if (setsid() < 0 && getpid() != getsid(0)) {
+        perror("setsid");
+        return 1;
+    }
+
+    int fd = open(tty, O_RDWR);
+    if (fd < 0) {
+        perror(tty);
+        return 1;
+    }
+
+    if (ioctl(fd, TIOCSCTTY, 0) != 0)
+        perror("TIOCSCTTY");
+
+    if (dup2(fd, STDIN_FILENO) < 0 || dup2(fd, STDOUT_FILENO) < 0 || dup2(fd, STDERR_FILENO) < 0) {
+        perror("dup2");
+        return 1;
+    }
+
+    if (fd > STDERR_FILENO)
+        close(fd);
+
+    execvp(argv[2], &argv[2]);
+    perror(argv[2]);
+    return 1;
+}