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| author | Ulrich Drepper <drepper@redhat.com> | 2009-07-26 12:55:03 -0700 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2009-07-26 12:55:03 -0700 |
| commit | aa7492d20e5a2cef54dab7b41f534048b3eca479 (patch) | |
| tree | 45a121112a357bc17af6cf04cea1b10167a37ffb /sysdeps/unix/sysv/linux | |
| parent | e28b969b49811a30887e7a252ac1804a055fe297 (diff) | |
| download | glibc-aa7492d20e5a2cef54dab7b41f534048b3eca479.tar.gz glibc-aa7492d20e5a2cef54dab7b41f534048b3eca479.tar.xz glibc-aa7492d20e5a2cef54dab7b41f534048b3eca479.zip | |
Compatibility of signalfd/eventfd with older kernels.
Diffstat (limited to 'sysdeps/unix/sysv/linux')
| -rw-r--r-- | sysdeps/unix/sysv/linux/eventfd.c | 15 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/kernel-features.h | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/signalfd.c | 15 |
3 files changed, 26 insertions, 6 deletions
diff --git a/sysdeps/unix/sysv/linux/eventfd.c b/sysdeps/unix/sysv/linux/eventfd.c index 4cd557983e..7f69ecdb8c 100644 --- a/sysdeps/unix/sysv/linux/eventfd.c +++ b/sysdeps/unix/sysv/linux/eventfd.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007, 2008 Free Software Foundation, Inc. +/* Copyright (C) 2007, 2008, 2009 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 @@ -19,14 +19,21 @@ #include <errno.h> #include <sys/eventfd.h> #include <sysdep.h> +#include <kernel-features.h> int eventfd (int count, int flags) { #ifdef __NR_eventfd2 - return INLINE_SYSCALL (eventfd2, 2, count, flags); -#else + int res = INLINE_SYSCALL (eventfd2, 2, count, flags); +# ifndef __ASSUME_EVENTFD2 + if (res != -1 || errno != ENOSYS) +# endif + return res; +#endif + +#ifndef __ASSUME_EVENTFD2 /* The old system call has no flag parameter which is bad. So we have to wait until we have to support to pass additional values to the kernel (sys_indirect) before implementing setting flags like @@ -43,5 +50,7 @@ eventfd (int count, int flags) __set_errno (ENOSYS); return -1; # endif +#elif !defined __NR_eventfd2 +# error "__ASSUME_EVENTFD2 defined but not __NR_eventfd2" #endif } diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h index 4562515790..ff065effb5 100644 --- a/sysdeps/unix/sysv/linux/kernel-features.h +++ b/sysdeps/unix/sysv/linux/kernel-features.h @@ -516,6 +516,8 @@ # define __ASSUME_SOCK_CLOEXEC 1 # define __ASSUME_IN_NONBLOCK 1 # define __ASSUME_PIPE2 1 +# define __ASSUME_EVENTFD2 1 +# define __ASSUME_SIGNALFD4 1 #endif /* Support for the accept4 syscall was added in 2.6.28. */ diff --git a/sysdeps/unix/sysv/linux/signalfd.c b/sysdeps/unix/sysv/linux/signalfd.c index 9898f29231..c2d974a45d 100644 --- a/sysdeps/unix/sysv/linux/signalfd.c +++ b/sysdeps/unix/sysv/linux/signalfd.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007, 2008 Free Software Foundation, Inc. +/* Copyright (C) 2007, 2008, 2009 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 @@ -20,14 +20,21 @@ #include <signal.h> #include <sys/signalfd.h> #include <sysdep.h> +#include <kernel-features.h> int signalfd (int fd, const sigset_t *mask, int flags) { #ifdef __NR_signalfd4 - return INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags); -#else + int res = INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags); +# ifndef __ASSUME_SIGNALFD4 + if (res != -1 || errno != ENOSYS) +# endif + return res; +#endif + +#ifndef __ASSUME_SIGNALFD4 /* The old system call has no flag parameter which is bad. So we have to wait until we have to support to pass additional values to the kernel (sys_indirect) before implementing setting flags like @@ -44,5 +51,7 @@ signalfd (int fd, const sigset_t *mask, int flags) __set_errno (ENOSYS); return -1; # endif +#elif !defined __NR_signalfd4 +# error "__ASSUME_SIGNALFD4 defined but not __NR_signalfd4" #endif } |