flock() should return EWOULDBLOCK instead of EAGAIN.

POSIX requires fcntl() to return EAGAIN or EACCES, whereas BSD
requires flock() to return EWOULDBLOCK.  On most systems EAGAIN
and EWOULDBLOCK use the same number, but on some (e.g. Linux on
PA-RISC) they do not.

1 files changed, 5 insertions, 1 deletions

diff --git a/pp_sys.c b/pp_sys.c
index a985d658cd..bea4b7d47e 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -5579,6 +5579,7 @@ PP(pp_syscall)
 static int
 fcntl_emulate_flock(int fd, int operation)
 {
+    int res;
     struct flock flock;
 
     switch (operation & ~LOCK_NB) {
@@ -5598,7 +5599,10 @@ fcntl_emulate_flock(int fd, int operation)
     flock.l_whence = SEEK_SET;
     flock.l_start = flock.l_len = (Off_t)0;
 
-    return fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &flock);
+    res = fcntl(fd, (operation & LOCK_NB) ? F_SETLK : F_SETLKW, &flock);
+    if (res == -1 && ((errno == EAGAIN) || (errno == EACCES)))
+	errno = EWOULDBLOCK;
+    return res;
 }
 
 #endif /* FCNTL_EMULATE_FLOCK */