git-lockf-0

commit b15b1a959040fe8cdfbc51092a7b72032f6c9b86
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Mon Nov 19 20:22:30 2018 +0100

    hurd: Support lockf at offset 0 with size 0 or 1.

            * sysdeps/mach/hurd/f_setlk.c: Include <unistd.h>.
            (__f_setlk): When whence is SEEK_CUR, use __lseek64 to convert it to
            SEEK_SET.

Gbp-Pq: Topic hurd-i386
Gbp-Pq: Name git-lockf-0.diff

diff --git a/sysdeps/mach/hurd/f_setlk.c b/sysdeps/mach/hurd/f_setlk.c
index 718af67e3280c788c45b406d188b5f0e64a54784..edfb292dbf1c1a9fd188bb7553e4cb90cb73e075 100644 (file)
--- a/sysdeps/mach/hurd/f_setlk.c
+++ b/sysdeps/mach/hurd/f_setlk.c
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/file.h>
 #include <fcntl.h>
+#include <unistd.h>
 #include <errno.h>
 
 /* XXX
@@ -45,6 +46,18 @@ __f_setlk (int fd, int type, int whence, __off64_t start, __off64_t len, int wai
   if (cmd != LOCK_UN && wait == 0)
     cmd |= LOCK_NB;
 
+  if (whence == SEEK_CUR)
+    {
+      /* In case the target position is 0, we can support it below.  */
+      __off64_t cur = __lseek64 (fd, 0, SEEK_CUR);
+
+      if (cur >= 0)
+       {
+         start = cur + start;
+         whence = SEEK_SET;
+       }
+    }
+
   switch (whence)
     {
     case SEEK_SET: