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b168057a | 1 | /* Copyright (C) 2008-2015 Free Software Foundation, Inc. |
bdcebfc4 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2008. | |
4 | ||
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. | |
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 | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
bdcebfc4 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <signal.h> | |
21 | #include <sys/socket.h> | |
22 | ||
23 | #include <sysdep-cancel.h> | |
24 | #include <sys/syscall.h> | |
1e1dc4e8 | 25 | #include <kernel-features.h> |
bdcebfc4 | 26 | |
dd481ccf JM |
27 | /* Do not use the accept4 syscall on socketcall architectures unless |
28 | it was added at the same time as the socketcall support or can be | |
29 | assumed to be present. */ | |
30 | #if defined __ASSUME_SOCKETCALL \ | |
31 | && !defined __ASSUME_ACCEPT4_SYSCALL_WITH_SOCKETCALL \ | |
32 | && !defined __ASSUME_ACCEPT4_SYSCALL | |
33 | # undef __NR_accept4 | |
34 | #endif | |
f93fc0b7 UD |
35 | |
36 | #ifdef __NR_accept4 | |
bdcebfc4 | 37 | int |
f93fc0b7 | 38 | accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags) |
bdcebfc4 UD |
39 | { |
40 | if (SINGLE_THREAD_P) | |
f93fc0b7 | 41 | return INLINE_SYSCALL (accept4, 4, fd, addr.__sockaddr__, addr_len, flags); |
bdcebfc4 UD |
42 | |
43 | int oldtype = LIBC_CANCEL_ASYNC (); | |
44 | ||
f93fc0b7 UD |
45 | int result = INLINE_SYSCALL (accept4, 4, fd, addr.__sockaddr__, addr_len, |
46 | flags); | |
bdcebfc4 UD |
47 | |
48 | LIBC_CANCEL_RESET (oldtype); | |
49 | ||
50 | return result; | |
51 | } | |
1e1dc4e8 | 52 | #elif defined __NR_socketcall |
dd481ccf | 53 | # ifndef __ASSUME_ACCEPT4_SOCKETCALL |
1e1dc4e8 JJ |
54 | extern int __internal_accept4 (int fd, __SOCKADDR_ARG addr, |
55 | socklen_t *addr_len, int flags) | |
56 | attribute_hidden; | |
57 | ||
58 | static int have_accept4; | |
59 | ||
60 | int | |
61 | accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags) | |
62 | { | |
a1ffb40e | 63 | if (__glibc_likely (have_accept4 >= 0)) |
1e1dc4e8 JJ |
64 | { |
65 | int ret = __internal_accept4 (fd, addr, addr_len, flags); | |
66 | /* The kernel returns -EINVAL for unknown socket operations. | |
67 | We need to convert that error to an ENOSYS error. */ | |
68 | if (__builtin_expect (ret < 0, 0) | |
69 | && have_accept4 == 0 | |
70 | && errno == EINVAL) | |
71 | { | |
72 | /* Try another call, this time with the FLAGS parameter | |
73 | cleared and an invalid file descriptor. This call will not | |
74 | cause any harm and it will return immediately. */ | |
75 | ret = __internal_accept4 (-1, addr, addr_len, 0); | |
76 | if (errno == EINVAL) | |
77 | { | |
78 | have_accept4 = -1; | |
79 | __set_errno (ENOSYS); | |
80 | } | |
81 | else | |
82 | { | |
83 | have_accept4 = 1; | |
84 | __set_errno (EINVAL); | |
85 | } | |
86 | return -1; | |
87 | } | |
88 | return ret; | |
89 | } | |
90 | __set_errno (ENOSYS); | |
91 | return -1; | |
92 | } | |
93 | # else | |
dd481ccf JM |
94 | /* When __ASSUME_ACCEPT4_SOCKETCALL accept4 is defined in |
95 | internal_accept4.S. */ | |
1e1dc4e8 | 96 | # endif |
bdcebfc4 UD |
97 | #else |
98 | int | |
f93fc0b7 | 99 | accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags) |
bdcebfc4 UD |
100 | { |
101 | __set_errno (ENOSYS); | |
102 | return -1; | |
bdcebfc4 | 103 | } |
f93fc0b7 | 104 | stub_warning (accept4) |
bdcebfc4 | 105 | #endif |