2007-10-04 Jakub Jelinek <jakub@redhat.com>

2007-10-03  Jakub Jelinek  <jakub@redhat.com>

6 files changed, 145 insertions, 2 deletions

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index e638fd09ce..6ba3a25c84 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -13,7 +13,8 @@ endif
 
 ifeq ($(subdir),misc)
 sysdep_routines += sysctl clone llseek umount umount2 readahead \
-		   setfsuid setfsgid makedev epoll_pwait signalfd
+		   setfsuid setfsgid makedev epoll_pwait signalfd \
+		   eventfd eventfd_read eventfd_write
 
 CFLAGS-gethostid.c = -fexceptions
 
diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions
index eac69788b1..dbf2ae5901 100644
--- a/sysdeps/unix/sysv/linux/Versions
+++ b/sysdeps/unix/sysv/linux/Versions
@@ -130,7 +130,7 @@ libc {
     epoll_pwait; sync_file_range; sched_getcpu;
   }
   GLIBC_2.7 {
-    signalfd;
+    eventfd; eventfd_read; eventfd_write; signalfd;
   }
   GLIBC_PRIVATE {
     # functions used in other libraries
diff --git a/sysdeps/unix/sysv/linux/eventfd.c b/sysdeps/unix/sysv/linux/eventfd.c
new file mode 100644
index 0000000000..180861aad2
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/eventfd.c
@@ -0,0 +1,43 @@
+/* Copyright (C) 2007 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 <errno.h>
+#include <sys/eventfd.h>
+#include <sysdep.h>
+
+
+int
+eventfd (int count, int flags)
+{
+  /* The 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
+     O_NONBLOCK etc.  */
+  if (flags != 0)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+#ifdef __NR_eventfd
+  return INLINE_SYSCALL (eventfd, 1, count);
+#else
+  __set_errno (ENOSYS);
+  return -1;
+#endif
+}
diff --git a/sysdeps/unix/sysv/linux/eventfd_read.c b/sysdeps/unix/sysv/linux/eventfd_read.c
new file mode 100644
index 0000000000..1113f11478
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/eventfd_read.c
@@ -0,0 +1,28 @@
+/* Copyright (C) 2007 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 <errno.h>
+#include <unistd.h>
+#include <sys/eventfd.h>
+
+
+int
+eventfd_read (int fd, eventfd_t *value)
+{
+  return read (fd, value, sizeof (eventfd_t)) != sizeof (eventfd_t) ? -1 : 0;
+}
diff --git a/sysdeps/unix/sysv/linux/eventfd_write.c b/sysdeps/unix/sysv/linux/eventfd_write.c
new file mode 100644
index 0000000000..4bcf95daee
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/eventfd_write.c
@@ -0,0 +1,28 @@
+/* Copyright (C) 2007 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 <errno.h>
+#include <unistd.h>
+#include <sys/eventfd.h>
+
+
+int
+eventfd_write (int fd, eventfd_t value)
+{
+  return write (fd, &value, sizeof (eventfd_t)) != sizeof (eventfd_t) ? -1 : 0;
+}
diff --git a/sysdeps/unix/sysv/linux/sys/eventfd.h b/sysdeps/unix/sysv/linux/sys/eventfd.h
new file mode 100644
index 0000000000..1ebaea7b30
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sys/eventfd.h
@@ -0,0 +1,43 @@
+/* Copyright (C) 2007 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.  */
+
+#ifndef	_SYS_EVENTFD_H
+#define	_SYS_EVENTFD_H	1
+
+#include <stdint.h>
+
+
+/* Type for event counter.  */
+typedef uint64_t eventfd_t;
+
+
+__BEGIN_DECLS
+
+/* Return file descriptor for generic event channel.  Set initial
+   value to COUNT.  */
+extern int eventfd (int __count, int __flags) __THROW;
+
+/* Read event counter and possibly wait for events.  */
+extern int eventfd_read (int __fd, eventfd_t *__value);
+
+/* Increment event counter.  */
+extern int eventfd_write (int __fd, eventfd_t value);
+
+__END_DECLS
+
+#endif /* sys/eventfd.h */