diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/accept4.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/accept4.S | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/accept4.S b/sysdeps/unix/sysv/linux/i386/accept4.S new file mode 100644 index 0000000000..087ccc456f --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/accept4.S @@ -0,0 +1,183 @@ +/* Copyright (C) 1995-1998,2002,2003,2005, 2008 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep-cancel.h> +#include <socketcall.h> +#include <tls.h> +#include <kernel-features.h> + +#define EINVAL 22 +#define ENOSYS 38 + +#ifndef SOCKOP_accept4 +# define SOCKOP_accept4 18 +#endif + +#ifdef __ASSUME_ACCEPT4 +# define errlabel SYSCALL_ERROR_LABEL +#else +# define errlabel .Lerr + .data +have_accept4: + .long 0 +#endif + + .text +/* The socket-oriented system calls are handled unusally in Linux/i386. + They are all gated through the single `socketcall' system call number. + `socketcall' takes two arguments: the first is the subcode, specifying + which socket function is being called; and the second is a pointer to + the arguments to the specific function. */ + +.globl __libc_accept4 +ENTRY (__libc_accept4) +#ifdef CENABLE + SINGLE_THREAD_P + jne 1f +#endif + + /* Save registers. */ + movl %ebx, %edx + cfi_register (3, 2) + + movl $SYS_ify(socketcall), %eax /* System call number in %eax. */ + + movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */ + lea 4(%esp), %ecx /* Address of args is 2nd arg. */ + + /* Do the system call trap. */ + ENTER_KERNEL + + /* Restore registers. */ + movl %edx, %ebx + cfi_restore (3) + + /* %eax is < 0 if there was an error. */ + cmpl $-125, %eax + jae errlabel + + /* Successful; return the syscall's value. */ +L(pseudo_end): + ret + + +#ifdef CENABLE + /* We need one more register. */ +1: pushl %esi + cfi_adjust_cfa_offset(4) + + /* Enable asynchronous cancellation. */ + CENABLE + movl %eax, %esi + cfi_offset(6, -8) /* %esi */ + + /* Save registers. */ + movl %ebx, %edx + cfi_register (3, 2) + + movl $SYS_ify(socketcall), %eax /* System call number in %eax. */ + + movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */ + lea 8(%esp), %ecx /* Address of args is 2nd arg. */ + + /* Do the system call trap. */ + ENTER_KERNEL + + /* Restore registers. */ + movl %edx, %ebx + cfi_restore (3) + + /* Restore the cancellation. */ + xchgl %esi, %eax + CDISABLE + + /* Restore registers. */ + movl %esi, %eax + popl %esi + cfi_restore (6) + cfi_adjust_cfa_offset(-4) + + /* %eax is < 0 if there was an error. */ + cmpl $-125, %eax + jae errlabel + + /* Successful; return the syscall's value. */ + ret +#endif + +#ifndef __ASSUME_ACCEPT4 + /* The kernel returns -EINVAL for unknown socket operations. + We need to convert that error to an ENOSYS error. */ +.Lerr: cmpl $-EINVAL, %eax + jne SYSCALL_ERROR_LABEL + + /* Save registers. */ + pushl %ebx + cfi_adjust_cfa_offset(4) + cfi_offset(ebx, -8) + +# ifdef PIC + SETUP_PIC_REG (dx) + addl $_GLOBAL_OFFSET_TABLE_, %edx + movl have_accept4@GOTOFF(%edx), %eax +# else + movl have_accept4, %eax +# endif + testl %eax, %eax + jne 1f + + /* Try another call, this time with the FLAGS parameter + cleared and an invalid file descriptor. This call will not + cause any harm and it will return immediately. */ + movl $-1, 8(%esp) + movl $0, 20(%esp) + + movl $SYS_ify(socketcall), %eax /* System call number in %eax. */ + + movl $SOCKOP_accept4, %ebx /* Subcode is first arg to syscall. */ + lea 8(%esp), %ecx /* Address of args is 2nd arg. */ + + /* Do the system call trap. */ + ENTER_KERNEL + + cmpl $-EINVAL, %eax + movl $-1, %eax + je 3f + movl $1, %eax +3: +# ifdef PIC + movl %eax, have_accept4@GOTOFF(%edx) +# else + movl %eax, have_accept4 +# endif + + testl %eax, %eax + +1: movl $-EINVAL, %eax + jns 2f + movl $-ENOSYS, %eax + + /* Restore registers. */ +2: popl %ebx + cfi_restore (ebx) + + jmp SYSCALL_ERROR_LABEL +#endif +PSEUDO_END (__libc_accept4) + +weak_alias (__libc_accept4, accept4) |