fork/exec after attach

src/lxc/lxc_attach.c

@@ -25,6 +25,9 @@
 #include <errno.h>
 #include <sys/param.h>
 #include <pwd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
 #include "commands.h"
 #include "arguments.h"
 #include "namespace.h"
@@ -106,6 +109,32 @@ int main(int argc, char *argv[], char *envp[])
 		return -1;
 	}
 
+	pid = fork();
+
+	if (pid < 0) {
+		SYSERROR("failed to fork");
+		return -1;
+	}
+
+	if (pid) {
+		int status;
+
+	again:
+		if (waitpid(pid, &status, 0) < 0) {
+			if (errno == EINTR)
+				goto again;
+			SYSERROR("failed to wait '%d'", pid);
+			return -1;
+		}
+
+		if (WIFEXITED(status))
+			return WEXITSTATUS(status);
+
+		return -1;
+	}
+
+	if (!pid) {
+
 		if (my_args.argc) {
 			execve(my_args.argv[0], my_args.argv, envp);
 			SYSERROR("failed to exec '%s'", my_args.argv[0]);
@@ -116,7 +145,8 @@ int main(int argc, char *argv[], char *envp[])
 
 		passwd = getpwuid(uid);
 		if (!passwd) {
-		SYSERROR("failed to get passwd entry for uid '%d'", uid);
+			SYSERROR("failed to get passwd "		\
+				 "entry for uid '%d'", uid);
 			return -1;
 		}
 
@@ -131,5 +161,7 @@ int main(int argc, char *argv[], char *envp[])
 			return -1;
 		}
 
+	}
+
 	return 0;
 }