diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/daemontools-extras/s6-setlock.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/src/daemontools-extras/s6-setlock.c b/src/daemontools-extras/s6-setlock.c index cd938b7..6ba2ec8 100644 --- a/src/daemontools-extras/s6-setlock.c +++ b/src/daemontools-extras/s6-setlock.c @@ -42,9 +42,25 @@ int main (int argc, char const *const *argv) if (nb < 2) { - int r ; - int fd = open_create(argv[0]) ; - if (fd < 0) strerr_diefu2sys(111, "open_create ", argv[0]) ; + int r, fd ; + if (ex) + { + fd = open_create(argv[0]) ; + if (fd < 0) strerr_diefu3sys(111, "open ", argv[0], " for writing") ; + } + else + { + fd = open_read(argv[0]) ; + if (fd < 0) + { + if (errno != ENOENT) strerr_diefu3sys(111, "open ", argv[0], " for reading") ; + fd = open_create(argv[0]) ; + if (fd < 0) strerr_diefu2sys(111, "create ", argv[0]) ; + close(fd) ; + fd = open_read(argv[0]) ; + if (fd < 0) strerr_diefu3sys(111, "open ", argv[0], " for reading") ; + } + } r = fd_lock(fd, ex, nb) ; if (!r) errno = EBUSY ; if (r < 1) strerr_diefu2sys(1, "lock ", argv[0]) ; |