1 files changed, 46 insertions, 0 deletions
diff --git a/lib/exec.c b/lib/exec.c
new file mode 100644
index 0000000..9b1c8f4
--- /dev/null
+++ b/lib/exec.c
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <sys/wait.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "utils.h"
+#include "namespace.h"
+
+int cmd_exec(const char *cmd, char **argv, bool do_fork,
+	     int (*setup)(void *), void *arg)
+{
+	fflush(stdout);
+	if (do_fork) {
+		int status;
+		pid_t pid;
+
+		pid = fork();
+		if (pid < 0) {
+			perror("fork");
+			exit(1);
+		}
+
+		if (pid != 0) {
+			/* Parent  */
+			if (waitpid(pid, &status, 0) < 0) {
+				perror("waitpid");
+				exit(1);
+			}
+
+			if (WIFEXITED(status)) {
+				return WEXITSTATUS(status);
+			}
+
+			exit(1);
+		}
+	}
+
+	if (setup && setup(arg))
+		return -1;
+
+	if (execvp(cmd, argv)  < 0)
+		fprintf(stderr, "exec of \"%s\" failed: %s\n",
+				cmd, strerror(errno));
+	_exit(1);
+}