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e61abf83 | 1 | /* readv supports all Linux kernels >= 2.0. |
2dbe6afe | 2 | Copyright (C) 1997,1998,2000,2002,2003,2009 Free Software Foundation, Inc. |
e61abf83 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
e61abf83 UD |
9 | |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
e61abf83 | 14 | |
41bdb6e2 AJ |
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 | |
18 | 02111-1307 USA. */ | |
e61abf83 UD |
19 | |
20 | #include <errno.h> | |
21 | #include <stddef.h> | |
22 | #include <sys/param.h> | |
23 | #include <sys/uio.h> | |
24 | ||
6ee8d334 | 25 | #include <sysdep-cancel.h> |
0dee6738 | 26 | #include <sys/syscall.h> |
4bbb61e4 | 27 | #include <bp-checks.h> |
2dbe6afe | 28 | #include <kernel-features.h> |
0dee6738 | 29 | |
f521be31 | 30 | #ifndef __ASSUME_COMPLETE_READV_WRITEV |
bcaad6ee AJ |
31 | static ssize_t __atomic_readv_replacement (int, __const struct iovec *, |
32 | int) internal_function; | |
f521be31 | 33 | #endif |
e61abf83 UD |
34 | |
35 | ||
36 | /* Not all versions of the kernel support the large number of records. */ | |
c57abfa7 UD |
37 | #ifndef UIO_FASTIOV |
38 | # define UIO_FASTIOV 8 /* 8 is a safe number. */ | |
e61abf83 UD |
39 | #endif |
40 | ||
41 | ||
6ee8d334 UD |
42 | ssize_t |
43 | __libc_readv (fd, vector, count) | |
44 | int fd; | |
45 | const struct iovec *vector; | |
46 | int count; | |
47 | { | |
7166c77a | 48 | ssize_t result; |
6ee8d334 | 49 | |
7166c77a UD |
50 | if (SINGLE_THREAD_P) |
51 | result = INLINE_SYSCALL (readv, 3, fd, CHECK_N (vector, count), count); | |
52 | else | |
53 | { | |
54 | int oldtype = LIBC_CANCEL_ASYNC (); | |
6ee8d334 | 55 | |
7166c77a | 56 | result = INLINE_SYSCALL (readv, 3, fd, CHECK_N (vector, count), count); |
6ee8d334 | 57 | |
7166c77a UD |
58 | LIBC_CANCEL_RESET (oldtype); |
59 | } | |
6ee8d334 | 60 | |
7166c77a | 61 | #ifdef __ASSUME_COMPLETE_READV_WRITEV |
6ee8d334 | 62 | return result; |
7166c77a UD |
63 | #else |
64 | if (result >= 0 || errno != EINVAL || count <= UIO_FASTIOV) | |
65 | return result; | |
66 | ||
67 | return __atomic_readv_replacement (fd, vector, count); | |
68 | #endif | |
6ee8d334 | 69 | } |
6166815d UD |
70 | strong_alias (__libc_readv, __readv) |
71 | weak_alias (__libc_readv, readv) | |
5ae9d168 | 72 | |
2dbe6afe UD |
73 | #ifndef __ASSUME_COMPLETE_READV_WRITEV |
74 | # define __libc_readv static internal_function __atomic_readv_replacement | |
75 | # include <sysdeps/posix/readv.c> | |
76 | #endif |