1 /* readv supports all Linux kernels >= 2.0.
2 Copyright (C) 1997,1998,2000,2002,2003 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #include <sys/param.h>
25 #include <sysdep-cancel.h>
26 #include <sys/syscall.h>
27 #include <bp-checks.h>
29 static ssize_t
__atomic_readv_replacement (int, __const
struct iovec
*,
30 int) internal_function
;
33 /* Not all versions of the kernel support the large number of records. */
35 # define UIO_FASTIOV 8 /* 8 is a safe number. */
39 /* We should deal with kernel which have a smaller UIO_FASTIOV as well
40 as a very big count. */
42 do_readv (int fd
, const struct iovec
*vector
, int count
)
46 bytes_read
= INLINE_SYSCALL (readv
, 3, fd
, CHECK_N (vector
, count
), count
);
48 if (bytes_read
>= 0 || errno
!= EINVAL
|| count
<= UIO_FASTIOV
)
51 return __atomic_readv_replacement (fd
, vector
, count
);
56 __libc_readv (fd
, vector
, count
)
58 const struct iovec
*vector
;
62 return do_readv (fd
, vector
, count
);
64 int oldtype
= LIBC_CANCEL_ASYNC ();
66 int result
= do_readv (fd
, vector
, count
);
68 LIBC_CANCEL_RESET (oldtype
);
72 strong_alias (__libc_readv
, __readv
)
73 weak_alias (__libc_readv
, readv
)
75 #define __libc_readv static internal_function __atomic_readv_replacement
76 #include <sysdeps/posix/readv.c>