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authorLaurent Bercot <ska-skaware@skarnet.org>2019-01-31 20:33:42 +0000
committerLaurent Bercot <ska-skaware@skarnet.org>2019-01-31 20:33:42 +0000
commit6f9dc69704211a6123b225036bffb46c1a2d6e83 (patch)
treea81ae66206510363b76f496fcef267236834bb7c /src/libs6
parentc3f9dfe79b0eccf9b87a5cd6a0b3b1b62f964348 (diff)
downloads6-6f9dc69704211a6123b225036bffb46c1a2d6e83.tar.xz
Make "s6-svc -wu foo" wait for foo to be up. Document supervise/ creation.
Diffstat (limited to 'src/libs6')
-rw-r--r--src/libs6/s6_svc_write.c29
1 files changed, 16 insertions, 13 deletions
diff --git a/src/libs6/s6_svc_write.c b/src/libs6/s6_svc_write.c
index 70c3964..46d3178 100644
--- a/src/libs6/s6_svc_write.c
+++ b/src/libs6/s6_svc_write.c
@@ -7,21 +7,24 @@
int s6_svc_write (char const *fifo, char const *data, size_t datalen)
{
- int fd = open_write(fifo) ;
- if (fd < 0) switch (errno)
- {
- case ENXIO : return 0 ;
- case ENOENT :
- case ENOTDIR :
- case EISDIR : return -2 ;
- default : return -1 ;
- }
- if (ndelay_off(fd) == -1) return -1 ;
- if (fd_write(fd, data, datalen) == -1)
+ if (datalen)
{
+ int fd = open_write(fifo) ;
+ if (fd < 0) switch (errno)
+ {
+ case ENXIO : return 0 ;
+ case ENOENT :
+ case ENOTDIR :
+ case EISDIR : return -2 ;
+ default : return -1 ;
+ }
+ if (ndelay_off(fd) == -1) return -1 ;
+ if (fd_write(fd, data, datalen) == -1)
+ {
+ fd_close(fd) ;
+ return -1 ;
+ }
fd_close(fd) ;
- return -1 ;
}
- fd_close(fd) ;
return 1 ;
}