Check status of shell command

2 files changed, 19 insertions, 2 deletions

diff --git a/build.1 b/build.1
index 3d8fcda..cf66324 100644
--- a/build.1
+++ b/build.1
@@ -76,6 +76,18 @@ in the same shell process.
 This means that you can keep state across multiple commands.
 Note that all commands are executed
 regardless of the exit status of previous commands.
+.Pp
+.Nm
+exits with a positive status if a command failed.
+Note that it checks the status
+of the entire command sent to the shell,
+not the individual command lines.
+To emulate the behavior of
+.Xr make 1 ,
+which fails if any individual command line fails,
+you can use
+.Ql set -e
+in your command line.
 .
 .Sh EXAMPLES
 .Pp
diff --git a/build.c b/build.c
index 8b4e060..fc21925 100644
--- a/build.c
+++ b/build.c
@@ -32,7 +32,7 @@ main(int argc, char *argv[])
 {
 	char *b, buf[MAXBUF], *cmd[MAXCMDS], *d, *dep, *name, *tgt;
 	FILE *fp;
-	int c, dflag, fflag, i, icmd, j;
+	int c, dflag, fflag, i, icmd, j, s, status;
 	struct stat sb, ssb;
 
 	/* allocate memory */
@@ -46,6 +46,7 @@ main(int argc, char *argv[])
 	if (!dep) err(1, "malloc");
 
 	tgt[0] = dep[0] = 0;
+	status = 0;
 
 	/* process arguments */
 	name = argv[0];
@@ -162,11 +163,15 @@ build:
 			strncat(buf, cmd[j], MAXBUF-1);
 			strncat(buf, "\n", MAXBUF-1);
 		}
-		system(buf);
+		s = system(buf);
+		if (s != -1)
+			status += s;
 
 done:
 		fclose(fp);
 	}
+
+	return status > 0;
 }
 
 void