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authorUlrich Drepper <drepper@redhat.com>2009-10-29 10:12:59 -0700
committerUlrich Drepper <drepper@redhat.com>2009-10-29 10:12:59 -0700
commit81c84bd9022328127f46d0484d254848911ea198 (patch)
treecf83570345f135db80dbf89a8439e0b46a70ef60 /sysdeps
parentd9e8f9ec5557cc6ffcc154eafc4d2f2348df7b6b (diff)
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Fix F_GETOWN on some Linux archs.
The syscall conventions on some Linux archs prevented F_GETOWN from working correctly in some situations. This can be rectified when using the new F_GETOWN_EX command.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/fcntl.c42
-rw-r--r--sysdeps/unix/sysv/linux/i386/fcntl.c29
-rw-r--r--sysdeps/unix/sysv/linux/kernel-features.h5
3 files changed, 71 insertions, 5 deletions
diff --git a/sysdeps/unix/sysv/linux/fcntl.c b/sysdeps/unix/sysv/linux/fcntl.c
index 1f5aca1..b19654c 100644
--- a/sysdeps/unix/sysv/linux/fcntl.c
+++ b/sysdeps/unix/sysv/linux/fcntl.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2000, 2002, 2003, 2004, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -23,6 +23,40 @@
#include <stdarg.h>
#include <sys/syscall.h>
+#include <kernel-features.h>
+
+
+#ifdef __ASSUME_F_GETOWN_EX
+# define miss_F_GETOWN_EX 0
+#else
+static int miss_F_GETOWN_EX;
+#endif
+
+
+static int
+do_fcntl (int fd, int cmd, void *arg)
+{
+ if (cmd != F_GETOWN || miss_F_GETOWN_EX)
+ return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+
+ INTERNAL_SYSCALL_DECL (err);
+ struct f_owner_ex fex;
+ int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex);
+ if (!INTERNAL_SYSCALL_ERROR_P (res, err))
+ return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
+
+#ifndef __ASSUME_F_GETOWN_EX
+ if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
+ {
+ res = INLINE_SYSCALL (fcntl, 3, fd, F_GETOWN, arg);
+ miss_F_GETOWN_EX = 1;
+ return res;
+ }
+#endif
+
+ __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
+ return -1;
+}
#ifndef NO_CANCELLATION
@@ -36,7 +70,7 @@ __fcntl_nocancel (int fd, int cmd, ...)
arg = va_arg (ap, void *);
va_end (ap);
- return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+ return do_fcntl (fd, cmd, arg);
}
#endif
@@ -52,11 +86,11 @@ __libc_fcntl (int fd, int cmd, ...)
va_end (ap);
if (SINGLE_THREAD_P || cmd != F_SETLKW)
- return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+ return do_fcntl (fd, cmd, arg);
int oldtype = LIBC_CANCEL_ASYNC ();
- int result = INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
+ int result = do_fcntl (fd, cmd, arg);
LIBC_CANCEL_RESET (oldtype);
diff --git a/sysdeps/unix/sysv/linux/i386/fcntl.c b/sysdeps/unix/sysv/linux/i386/fcntl.c
index b27373d..5544d6e 100644
--- a/sysdeps/unix/sysv/linux/i386/fcntl.c
+++ b/sysdeps/unix/sysv/linux/i386/fcntl.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2000,2002,2003,2004,2006 Free Software Foundation, Inc.
+/* Copyright (C) 2000,2002,2003,2004,2006,2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -30,6 +30,13 @@
int __have_no_fcntl64;
#endif
+#ifdef __ASSUME_F_GETOWN_EX
+# define miss_F_GETOWN_EX 0
+#else
+static int miss_F_GETOWN_EX;
+#endif
+
+
#if defined NO_CANCELLATION && __ASSUME_FCNTL64 == 0
# define __fcntl_nocancel __libc_fcntl
#endif
@@ -119,6 +126,26 @@ __fcntl_nocancel (int fd, int cmd, ...)
assert (F_SETLK - F_SETLKW == F_SETLK64 - F_SETLKW64);
return INLINE_SYSCALL (fcntl, 3, fd, cmd + F_SETLK - F_SETLK64, &fl);
}
+ case F_GETOWN:
+ if (! miss_F_GETOWN_EX)
+ {
+ INTERNAL_SYSCALL_DECL (err);
+ struct f_owner_ex fex;
+ int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex);
+ if (!INTERNAL_SYSCALL_ERROR_P (res, err))
+ return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
+
+#ifndef __ASSUME_F_GETOWN_EX
+ if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
+ miss_F_GETOWN_EX = 1;
+ else
+#endif
+ {
+ __set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
+ return -1;
+ }
+ }
+ /* FALLTHROUGH */
default:
return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
}
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index ff065ef..f48e644 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -542,3 +542,8 @@
# define __ASSUME_PREADV 1
# define __ASSUME_PWRITEV 1
#endif
+
+/* Support for F_GETOWN_EX was introduced in 2.6.32. */
+#if __LINUX_KERNEL_VERSION >= 0x020620
+# define __ASSUME_F_GETOWN_EX 1
+#endif