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-rw-r--r--doc/s6-svlisten.html2
-rw-r--r--doc/s6-svwait.html2
-rw-r--r--src/supervision/s6-svlisten.c4
-rw-r--r--src/supervision/s6-svwait.c2
4 files changed, 7 insertions, 3 deletions
diff --git a/doc/s6-svlisten.html b/doc/s6-svlisten.html
index 8fdbc88..96d3f74 100644
--- a/doc/s6-svlisten.html
+++ b/doc/s6-svlisten.html
@@ -52,6 +52,8 @@ their state changes. </li>
<li> It spawns <em>prog...</em> as a child right after getting the
initial state of all the monitored services. </li>
<li> It then blocks until the wanted state happens. </li>
+ <li> If no service directories are listed (the block is empty), then
+instead of doing all that, it immediately execs into <em>prog...</em>.
</ul>
<h2> Exit codes </h2>
diff --git a/doc/s6-svwait.html b/doc/s6-svwait.html
index 553201b..daa497f 100644
--- a/doc/s6-svwait.html
+++ b/doc/s6-svwait.html
@@ -35,7 +35,7 @@ s6-svwait only waits for notifications; it never polls.
<p>
s6-svwait monitors one or more <a href="servicedir.html">service
directories</a> given as its arguments, waiting for a state (ready, up or down) to
-happen.
+happen. If no service directories are listed, it immediately exits 0.
</p>
<h2> Exit codes </h2>
diff --git a/src/supervision/s6-svlisten.c b/src/supervision/s6-svlisten.c
index 205a382..2ab1d9b 100644
--- a/src/supervision/s6-svlisten.c
+++ b/src/supervision/s6-svlisten.c
@@ -9,6 +9,7 @@
#include <skalibs/strerr.h>
#include <skalibs/djbunix.h>
#include <skalibs/selfpipe.h>
+#include <skalibs/exec.h>
#include <s6/compat.h>
#include "s6-svlisten.h"
@@ -49,8 +50,9 @@ int main (int argc, char const **argv, char const *const *envp)
}
if (argc < 3) dieusage() ;
argc1 = s6_el_semicolon(argv) ;
- if (!argc1 || argc == argc1 + 1) dieusage() ;
+ if (argc == argc1 + 1) dieusage() ;
if (argc1 >= argc) strerr_dief1x(100, "unterminated servicedir block") ;
+ if (!argc1) xexec(argv + argc1 + 1) ;
if (wantup == 2 && or)
{
or = 0 ;
diff --git a/src/supervision/s6-svwait.c b/src/supervision/s6-svwait.c
index 2c7a312..78f5c3f 100644
--- a/src/supervision/s6-svwait.c
+++ b/src/supervision/s6-svwait.c
@@ -45,7 +45,7 @@ int main (int argc, char const *const *argv)
argc -= l.ind ; argv += l.ind ;
if (t) tain_from_millisecs(&deadline, t) ; else deadline = tain_infinite_relative ;
}
- if (!argc) dieusage() ;
+ if (!argc) return 0 ;
tain_now_set_stopwatch_g() ;
tain_add_g(&deadline, &deadline) ;