Fix spawn*() so it can report errors to the caller

If nopen is not in PATH, noice will briefly print a warning about it
so the user knows.

Also, add NOPENCMD define in noiceconf.def.h to specify the default
plumber program.

1 files changed, 2 insertions, 2 deletions

diff --git a/util.h b/util.h
index 0ccdb50..01da706 100644
--- a/util.h
+++ b/util.h
@@ -24,5 +24,5 @@ size_t strlcat(char *, const char *, size_t);
 #undef strlcpy
 size_t strlcpy(char *, const char *, size_t);
 int strverscmp(const char *, const char *);
-void spawnvp(char *, char *, char *[]);
-void spawnlp(char *, char *, char *, ...);
+int spawnvp(char *, char *, char *[]);
+int spawnlp(char *, char *, char *, ...);