6188 add support for eventfd

Reviewed by: Albert Lee <trisk@omniti.com>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

6 files changed, 78 insertions, 0 deletions

diff --git a/usr/src/lib/libc/amd64/Makefile b/usr/src/lib/libc/amd64/Makefile
index 3d649dfe9d..0c1421bbf2 100644
--- a/usr/src/lib/libc/amd64/Makefile
+++ b/usr/src/lib/libc/amd64/Makefile
@@ -867,6 +867,7 @@ PORTSYS=			\
 	execl.o			\
 	execle.o		\
 	execv.o			\
+	eventfd.o		\
 	fcntl.o			\
 	getpagesizes.o		\
 	getpeerucred.o		\
diff --git a/usr/src/lib/libc/i386/Makefile.com b/usr/src/lib/libc/i386/Makefile.com
index beb568ebf6..9a76280c0a 100644
--- a/usr/src/lib/libc/i386/Makefile.com
+++ b/usr/src/lib/libc/i386/Makefile.com
@@ -903,6 +903,7 @@ PORTSYS=			\
 	chmod.o			\
 	chown.o			\
 	corectl.o		\
+	eventfd.o		\
 	exacctsys.o		\
 	execl.o			\
 	execle.o		\
diff --git a/usr/src/lib/libc/port/mapfile-vers b/usr/src/lib/libc/port/mapfile-vers
index e133407665..c4571ef2f1 100644
--- a/usr/src/lib/libc/port/mapfile-vers
+++ b/usr/src/lib/libc/port/mapfile-vers
@@ -93,6 +93,13 @@ $if _x86 && _ELF64
 $add amd64
 $endif
 
+SYMBOL_VERSION ILLUMOS_0.13 {	# eventfd
+    protected:
+	eventfd;
+	eventfd_read;
+	eventfd_write;
+} ILLUMOS_0.12;
+
 SYMBOL_VERSION ILLUMOS_0.12 {	# arc4random and friends
     protected:
 	arc4random;
diff --git a/usr/src/lib/libc/port/sys/eventfd.c b/usr/src/lib/libc/port/sys/eventfd.c
new file mode 100644
index 0000000000..f165491cc1
--- /dev/null
+++ b/usr/src/lib/libc/port/sys/eventfd.c
@@ -0,0 +1,67 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright (c) 2015, Joyent, Inc.  All rights reserved.
+ */
+
+#include <sys/eventfd.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+int
+eventfd(unsigned int initval, int flags)
+{
+	int oflags = O_RDWR;
+	uint64_t val = initval;
+	int fd;
+
+	if (flags & ~(EFD_NONBLOCK | EFD_CLOEXEC | EFD_SEMAPHORE)) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	if (flags & EFD_NONBLOCK)
+		oflags |= O_NONBLOCK;
+
+	if (flags & EFD_CLOEXEC)
+		oflags |= O_CLOEXEC;
+
+	if ((fd = open("/dev/eventfd", oflags)) < 0)
+		return (-1);
+
+	if ((flags & EFD_SEMAPHORE) &&
+	    ioctl(fd, EVENTFDIOC_SEMAPHORE, 0) != 0) {
+		(void) close(fd);
+		return (-1);
+	}
+
+	if (write(fd, &val, sizeof (val)) < sizeof (val)) {
+		(void) close(fd);
+		return (-1);
+	}
+
+	return (fd);
+}
+
+int
+eventfd_read(int fd, eventfd_t *valp)
+{
+	return (read(fd, valp, sizeof (*valp)) < sizeof (*valp) ? -1 : 0);
+}
+
+int
+eventfd_write(int fd, eventfd_t val)
+{
+	return (write(fd, &val, sizeof (val)) < sizeof (val) ? -1 : 0);
+}
diff --git a/usr/src/lib/libc/sparc/Makefile.com b/usr/src/lib/libc/sparc/Makefile.com
index 2991bb2d4d..3856c5332c 100644
--- a/usr/src/lib/libc/sparc/Makefile.com
+++ b/usr/src/lib/libc/sparc/Makefile.com
@@ -937,6 +937,7 @@ PORTSYS=			\
 	chmod.o			\
 	chown.o			\
 	corectl.o		\
+	eventfd.o		\
 	exacctsys.o		\
 	execl.o			\
 	execle.o		\
diff --git a/usr/src/lib/libc/sparcv9/Makefile.com b/usr/src/lib/libc/sparcv9/Makefile.com
index 255121cab6..1a65ab7680 100644
--- a/usr/src/lib/libc/sparcv9/Makefile.com
+++ b/usr/src/lib/libc/sparcv9/Makefile.com
@@ -881,6 +881,7 @@ PORTSYS=			\
 	chmod.o			\
 	chown.o			\
 	corectl.o		\
+	eventfd.o		\
 	exacctsys.o		\
 	execl.o			\
 	execle.o		\