[nginx] Fixed portability issues with union sigval.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/7f035fd1ec7b
branches:  
changeset: 7448:7f035fd1ec7b
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Mon Jan 28 14:33:31 2019 +0000
description:
Fixed portability issues with union sigval.

AIO support in nginx was originally developed against FreeBSD versions 4-6,
where the sival_ptr field was named as sigval_ptr (seemingly by mistake[1]),
which made nginx use the only name available then.  The standard-complaint
name was restored in 2005 (first appeared in FreeBSD 7.0, 2008), retaining
compatibility with previous versions[2][3].  In DragonFly, similar changes
were committed in 2009[4], with backward compatibility recently removed[5].

The change switches to the standard name, retaining compatibility with old
FreeBSD versions.

[1] https://svnweb.freebsd.org/changeset/base/48621
[2] https://svnweb.freebsd.org/changeset/base/152029
[3] https://svnweb.freebsd.org/changeset/base/174003
[4] https://gitweb.dragonflybsd.org/dragonfly.git/commit/3693401
[5] https://gitweb.dragonflybsd.org/dragonfly.git/commit/7875042

diffstat:

 src/os/unix/ngx_file_aio_read.c  |  2 +-
 src/os/unix/ngx_freebsd_config.h |  6 ++++++
 2 files changed, 7 insertions(+), 1 deletions(-)

diffs (30 lines):

diff -r f56a4c91b303 -r 7f035fd1ec7b src/os/unix/ngx_file_aio_read.c
--- a/src/os/unix/ngx_file_aio_read.c	Mon Jan 28 13:23:37 2019 +0300
+++ b/src/os/unix/ngx_file_aio_read.c	Mon Jan 28 14:33:31 2019 +0000
@@ -110,7 +110,7 @@ ngx_file_aio_read(ngx_file_t *file, u_ch
 #if (NGX_HAVE_KQUEUE)
     aio->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
     aio->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
-    aio->aiocb.aio_sigevent.sigev_value.sigval_ptr = ev;
+    aio->aiocb.aio_sigevent.sigev_value.sival_ptr = ev;
 #endif
     ev->handler = ngx_file_aio_event_handler;
 
diff -r f56a4c91b303 -r 7f035fd1ec7b src/os/unix/ngx_freebsd_config.h
--- a/src/os/unix/ngx_freebsd_config.h	Mon Jan 28 13:23:37 2019 +0300
+++ b/src/os/unix/ngx_freebsd_config.h	Mon Jan 28 14:33:31 2019 +0000
@@ -89,8 +89,14 @@
 
 
 #if (NGX_HAVE_FILE_AIO)
+
 #include <aio.h>
 typedef struct aiocb  ngx_aiocb_t;
+
+#if (__FreeBSD_version < 700005 && !defined __DragonFly__)
+#define sival_ptr     sigval_ptr
+#endif
+
 #endif