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libc: add <sys/eventfd.h> and corresponding implementations.

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Change-Id: Ide040884c456190226e580513099fdb8377e015b
This commit is contained in:
David 'Digit' Turner 2010-09-26 22:29:14 +02:00
parent 9973a56422
commit defd162212
12 changed files with 162 additions and 0 deletions
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1
libc/Android.mk
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@ -11,6 +11,7 @@ libc_common_src_files := \
unistd/brk.c \
unistd/creat.c \
unistd/daemon.c \
unistd/eventfd.c \
unistd/exec.c \
unistd/fcntl.c \
unistd/fnmatch.c \

2
libc/SYSCALLS.TXT
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@ -259,6 +259,8 @@ int inotify_rm_watch(int, unsigned int) 318,293,292
int poll(struct pollfd *, unsigned int, long) 168
int eventfd:eventfd2(unsigned int, int) 356,328
# ARM-specific ARM_NR_BASE == 0x0f0000 == 983040
int __set_tls:ARM_set_tls(void*) 983045,-1
int cacheflush:ARM_cacheflush(long start, long end, long flags) 983042,-1

1
libc/arch-arm/syscalls.mk
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@ -172,5 +172,6 @@ syscall_src += arch-arm/syscalls/inotify_init.S
syscall_src += arch-arm/syscalls/inotify_add_watch.S
syscall_src += arch-arm/syscalls/inotify_rm_watch.S
syscall_src += arch-arm/syscalls/poll.S
syscall_src += arch-arm/syscalls/eventfd.S
syscall_src += arch-arm/syscalls/__set_tls.S
syscall_src += arch-arm/syscalls/cacheflush.S

19
libc/arch-arm/syscalls/eventfd.S Normal file
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@ -0,0 +1,19 @@
/* autogenerated by gensyscalls.py */
#include <sys/linux-syscalls.h>
.text
.type eventfd, #function
.globl eventfd
.align 4
.fnstart
eventfd:
.save {r4, r7}
stmfd sp!, {r4, r7}
ldr r7, =__NR_eventfd2
swi #0
ldmfd sp!, {r4, r7}
movs r0, r0
bxpl lr
b __set_syscall_errno
.fnend

1
libc/arch-sh/syscalls.mk
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@ -161,3 +161,4 @@ syscall_src += arch-sh/syscalls/inotify_init.S
syscall_src += arch-sh/syscalls/inotify_add_watch.S
syscall_src += arch-sh/syscalls/inotify_rm_watch.S
syscall_src += arch-sh/syscalls/poll.S
syscall_src += arch-sh/syscalls/eventfd.S

32
libc/arch-sh/syscalls/eventfd.S Normal file
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@ -0,0 +1,32 @@
/* autogenerated by gensyscalls.py */
#include <sys/linux-syscalls.h>
.text
.type eventfd, @function
.globl eventfd
.align 4
eventfd:
/* invoke trap */
mov.l 0f, r3 /* trap num */
trapa #(2 + 0x10)
/* check return value */
cmp/pz r0
bt __NR_eventfd2_end
/* keep error number */
sts.l pr, @-r15
mov.l 1f, r1
jsr @r1
mov r0, r4
lds.l @r15+, pr
__NR_eventfd2_end:
rts
nop
.align 2
0: .long __NR_eventfd2
1: .long __set_syscall_errno

1
libc/arch-x86/syscalls.mk
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@ -175,3 +175,4 @@ syscall_src += arch-x86/syscalls/inotify_init.S
syscall_src += arch-x86/syscalls/inotify_add_watch.S
syscall_src += arch-x86/syscalls/inotify_rm_watch.S
syscall_src += arch-x86/syscalls/poll.S
syscall_src += arch-x86/syscalls/eventfd.S

26
libc/arch-x86/syscalls/eventfd.S Normal file
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@ -0,0 +1,26 @@
/* autogenerated by gensyscalls.py */
#include <sys/linux-syscalls.h>
.text
.type eventfd, @function
.globl eventfd
.align 4
eventfd:
pushl %ebx
pushl %ecx
mov 12(%esp), %ebx
mov 16(%esp), %ecx
movl $__NR_eventfd2, %eax
int $0x80
cmpl $-129, %eax
jb 1f
negl %eax
pushl %eax
call __set_errno
addl $4, %esp
orl $-1, %eax
1:
popl %ecx
popl %ebx
ret

50
libc/include/sys/eventfd.h Normal file
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@ -0,0 +1,50 @@
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SYS_EVENTFD_H
#define _SYS_EVENTFD_H
#include <sys/cdefs.h>
#include <fcntl.h>
__BEGIN_DECLS
#define EFD_CLOEXEC O_CLOEXEC
#define EFD_NONBLOCK O_NONBLOCK
/* type of event counter */
typedef uint64_t eventfd_t;
extern int eventfd(unsigned int initval, int flags);
/* Compatibility with GLibc */
extern int eventfd_read(int fd, eventfd_t *counter);
extern int eventfd_write(int fd, const eventfd_t counter);
__END_DECLS
#endif /* _SYS_EVENTFD_H */

3
libc/include/sys/linux-syscalls.h
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@ -182,6 +182,7 @@
#define __NR_inotify_init (__NR_SYSCALL_BASE + 316)
#define __NR_inotify_add_watch (__NR_SYSCALL_BASE + 317)
#define __NR_inotify_rm_watch (__NR_SYSCALL_BASE + 318)
#define __NR_eventfd2 (__NR_SYSCALL_BASE + 356)
#define __NR_ARM_set_tls (__NR_SYSCALL_BASE + 983045)
#define __NR_ARM_cacheflush (__NR_SYSCALL_BASE + 983042)
#endif
@ -225,6 +226,7 @@
#define __NR_inotify_init (__NR_SYSCALL_BASE + 291)
#define __NR_inotify_add_watch (__NR_SYSCALL_BASE + 292)
#define __NR_inotify_rm_watch (__NR_SYSCALL_BASE + 293)
#define __NR_eventfd2 (__NR_SYSCALL_BASE + 328)
#endif
#if defined(__SH3__) || defined(__SH4__)
@ -282,6 +284,7 @@
#define __NR_inotify_init (__NR_SYSCALL_BASE + 290)
#define __NR_inotify_add_watch (__NR_SYSCALL_BASE + 291)
#define __NR_inotify_rm_watch (__NR_SYSCALL_BASE + 292)
#define __NR_eventfd2 (__NR_SYSCALL_BASE + 328)
#endif
#endif

1
libc/include/sys/linux-unistd.h
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@ -202,6 +202,7 @@ int inotify_init (void);
int inotify_add_watch (int, const char *, unsigned int);
int inotify_rm_watch (int, unsigned int);
int poll (struct pollfd *, unsigned int, long);
int eventfd (unsigned int, int);
int __set_tls (void*);
int cacheflush (long start, long end, long flags);
#ifdef __cplusplus

25
libc/unistd/eventfd.c Normal file
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@ -0,0 +1,25 @@
#include <sys/eventfd.h>
#include <unistd.h>
/* We duplicate the GLibc error semantics, which are poorly defined
* if the read() or write() does not return the proper number of bytes.
*/
int eventfd_read(int fd, eventfd_t *counter)
{
int ret = read(fd, counter, sizeof(*counter));
if (ret == sizeof(*counter))
return 0;
return -1;
}
int eventfd_write(int fd, eventfd_t counter)
{
int ret = write(fd, &counter, sizeof(counter));
if (ret == sizeof(counter))
return 0;
return -1;
}