Handle exit status of child process

README.md

@@ -405,8 +405,8 @@ To unmount a mount point highlight it in `nnn` (so that it's the current entry)
 
 Notes:
 
-1. `nnn` places you inside the mount point after both mount and unmount. This is done so you can ensure the operation completed successfully. To jump back to the last directory, press the usual <kbd>-</kbd>.
-2. `nnn` doesn't delete the mount point on unmount. This is to prevent accidental data loss.
+1. `nnn` places you inside the mount point after a successful (un)mount so you can ensure the operation completed successfully indeed. To jump back to the last directory, press the usual <kbd>-</kbd>.
+2. `nnn` doesn't delete the mount point on unmount to prevent accidental data loss.
 3. More information on [SSHFS](https://wiki.archlinux.org/index.php/SSHFS).
 
 #### Help

src/nnn.c

@@ -471,7 +471,7 @@ static struct timespec gtimeout;
 
 /* Forward declarations */
 static void redraw(char *path);
-static void spawn(char *file, char *arg1, char *arg2, const char *dir, uchar flag);
+static int spawn(char *file, char *arg1, char *arg2, const char *dir, uchar flag);
 static int (*nftw_fn)(const char *fpath, const struct stat *sb, int typeflag, struct FTW *ftwbuf);
 static int dentfind(const char *fname, int n);
 
@@ -939,33 +939,41 @@ static pid_t xfork(uchar flag)
 	return p;
 }
 
-static void join(pid_t p, uchar flag)
+static int join(pid_t p, uchar flag)
 {
-	int status;
+	int status = 0xFFFF;
 
-	if (!(flag & F_NOWAIT))
+	if (!(flag & F_NOWAIT)) {
 		/* wait for the child to exit */
 		do {
 		} while (waitpid(p, &status, 0) == -1);
 
+		if (WIFEXITED(status)) {
+			status = WEXITSTATUS(status);
+			DPRINTF_D(status);
+		}
+	}
+
 	/* restore parent's signal handling */
 	signal(SIGHUP, oldsighup);
 	signal(SIGTSTP, oldsigtstp);
+
+	return status;
 }
 
 /*
  * Spawns a child process. Behaviour can be controlled using flag.
  * Limited to 2 arguments to a program, flag works on bit set.
  */
-static void spawn(char *file, char *arg1, char *arg2, const char *dir, uchar flag)
+static int spawn(char *file, char *arg1, char *arg2, const char *dir, uchar flag)
 {
 	pid_t pid;
-	int status;
+	int status, retstatus = 0xFFFF;
 	char *argv[EXEC_ARGS_MAX] = {0};
 	char *cmd = NULL;
 
 	if (!file || !*file)
-		return;
+		return retstatus;
 
 	/* Swap args if the first arg is NULL and second isn't */
 	if (!arg1 && arg2) {
@@ -979,7 +987,7 @@ static void spawn(char *file, char *arg1, char *arg2, const char *dir, uchar fla
 		cmd = (char *)malloc(len);
 		if (!cmd) {
 			DPRINTF_S("malloc()!");
-			return;
+			return retstatus;
 		}
 
 		xstrlcpy(cmd, file, len);
@@ -987,7 +995,7 @@ static void spawn(char *file, char *arg1, char *arg2, const char *dir, uchar fla
 		if (status == -1 || status > (EXEC_ARGS_MAX - 3)) { /* arg1, arg2 and last NULL */
 			free(cmd);
 			DPRINTF_S("NULL or too many args");
-			return;
+			return retstatus;
 		}
 
 		argv[status++] = arg1;
@@ -1018,7 +1026,7 @@ static void spawn(char *file, char *arg1, char *arg2, const char *dir, uchar fla
 		execvp(*argv, argv);
 		_exit(1);
 	} else {
-		join(pid, flag);
+		retstatus = join(pid, flag);
 
 		DPRINTF_D(pid);
 		if (flag & F_NORMAL) {
@@ -1028,6 +1036,8 @@ static void spawn(char *file, char *arg1, char *arg2, const char *dir, uchar fla
 
 		free(cmd);
 	}
+
+	return retstatus;
 }
 
 /* Get program name from env var, else return fallback program */
@@ -2436,7 +2446,10 @@ static bool sshfs_mount(char *path, char *newpath, int *presel)
 	tmp[r + 1] = '\0';
 
 	/* Connect to remote */
-	spawn("sshfs", tmp, newpath, NULL, F_NORMAL);
+	if (spawn("sshfs", tmp, newpath, NULL, F_NORMAL)) {
+		printwait("mount failed", presel);
+		return FALSE;
+	}
 
 	return TRUE;
 }
@@ -2459,7 +2472,10 @@ static bool sshfs_unmount(char *path, char *fname, char *newpath, int *presel)
 		return FALSE;
 	}
 
-	spawn(cmd, "-u", newpath, NULL, F_NORMAL);
+	if (spawn(cmd, "-u", newpath, NULL, F_NORMAL)) {
+		printwait("unmount failed", presel);
+		return FALSE;
+	}
 
 	return TRUE;
 }