From 6f9dc69704211a6123b225036bffb46c1a2d6e83 Mon Sep 17 00:00:00 2001 From: Laurent Bercot Date: Thu, 31 Jan 2019 20:33:42 +0000 Subject: Make "s6-svc -wu foo" wait for foo to be up. Document supervise/ creation. --- src/libs6/s6_svc_write.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) (limited to 'src/libs6/s6_svc_write.c') 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 ; } -- cgit v1.2.3