1 /* Copyright (C) 1995-1998,2002,2003,2005, 2008 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 #include <sysdep-cancel.h>
20 #include <socketcall.h>
22 #include <kernel-features.h>
27 #ifdef __ASSUME_ACCEPT4
28 # define errlabel SYSCALL_ERROR_LABEL
30 # define errlabel .Lerr
37 /* The socket-oriented system calls are handled unusally in Linux/i386.
38 They are all gated through the single `socketcall' system call number.
39 `socketcall' takes two arguments: the first is the subcode, specifying
40 which socket function is being called; and the second is a pointer to
41 the arguments to the specific function. */
44 ENTRY (__libc_accept4)
54 movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
56 movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
57 lea 4(%esp), %ecx /* Address of args is 2nd arg. */
59 /* Do the system call trap. */
62 /* Restore registers. */
66 /* %eax is < 0 if there was an error. */
70 /* Successful; return the syscall's value. */
76 /* We need one more register. */
78 cfi_adjust_cfa_offset(4)
80 /* Enable asynchronous cancellation. */
83 cfi_offset(6, -8) /* %esi */
89 movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
91 movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
92 lea 8(%esp), %ecx /* Address of args is 2nd arg. */
94 /* Do the system call trap. */
97 /* Restore registers. */
101 /* Restore the cancellation. */
105 /* Restore registers. */
109 cfi_adjust_cfa_offset(-4)
111 /* %eax is < 0 if there was an error. */
115 /* Successful; return the syscall's value. */
119 #ifndef __ASSUME_ACCEPT4
120 /* The kernel returns -EINVAL for unknown socket operations.
121 We need to convert that error to an ENOSYS error. */
122 .Lerr: cmpl $-EINVAL, %eax
123 jne SYSCALL_ERROR_LABEL
125 /* Save registers. */
127 cfi_adjust_cfa_offset(4)
132 addl $_GLOBAL_OFFSET_TABLE_, %edx
133 movl have_accept4@GOTOFF(%edx), %eax
135 movl have_accept4, %eax
140 /* Try another call, this time with the FLAGS parameter
141 cleared and an invalid file descriptor. This call will not
142 cause any harm and it will return immediately. */
146 movl $SYS_ify(socketcall), %eax /* System call number in %eax. */
148 movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */
149 lea 8(%esp), %ecx /* Address of args is 2nd arg. */
151 /* Do the system call trap. */
160 movl %eax, have_accept4@GOTOFF(%edx)
162 movl %eax, have_accept4
167 1: movl $-EINVAL, %eax
171 /* Restore registers. */
175 jmp SYSCALL_ERROR_LABEL
177 PSEUDO_END (__libc_accept4)
179 weak_alias (__libc_accept4, accept4)