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(__mmap64): Optimize a bit.

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This commit is contained in:
Ulrich Drepper 2001-04-20 04:53:42 +00:00
parent aa29e3a242
commit 821fcfd5c3
1 changed files with 16 additions and 10 deletions
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26
sysdeps/unix/sysv/linux/powerpc/mmap64.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
/* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 1999.
@ -39,28 +39,32 @@ static int have_no_mmap2;
#endif
#endif
__ptr_t
__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, off64_t offset)
void *
__mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
{
if (! (offset & ((1 << PAGE_SHIFT)-1)))
{
__set_errno (EINVAL);
return MAP_FAILED;
}
#ifdef __NR_mmap2
if (
# ifndef __ASSUME_MMAP2_SYSCALL
! have_no_mmap2 &&
if (! have_no_mmap2)
# endif
! (offset & ((1 << PAGE_SHIFT)-1)))
{
# ifndef __ASSUME_MMAP2_SYSCALL
int saved_errno = errno;
# endif
__ptr_t result;
__ptrvalue (result) = INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr), len, prot,
flags, fd, (off_t) (offset >> PAGE_SHIFT));
void *result;
__ptrvalue (result) = INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr), len,
prot, flags, fd,
(off_t) (offset >> PAGE_SHIFT));
# if __BOUNDED_POINTERS__
__ptrlow (result) = __ptrvalue (result);
__ptrhigh (result) = __ptrvalue (result) + len;
# endif
# ifndef __ASSUME_MMAP2_SYSCALL
if (result != (__ptr_t) -1 || errno != ENOSYS)
if (result != MAP_FAILED || errno != ENOSYS)
# endif
return result;
@ -70,6 +74,7 @@ __mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, off64_t offset)
# endif
}
#endif
#ifndef __ASSUME_MMAP2_SYSCALL
if (offset != (off_t) offset || (offset + len) != (off_t) (offset + len))
{
__set_errno (EINVAL);
@ -77,6 +82,7 @@ __mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, off64_t offset)
}
return __mmap (addr, len, prot, flags, fd, (off_t) offset);
#endif
}
weak_alias (__mmap64, mmap64)