5640 want epoll support

Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Garrett D'Amore <garrett@damore.org>

6 files changed, 220 insertions, 0 deletions

diff --git a/usr/src/lib/libc/amd64/Makefile b/usr/src/lib/libc/amd64/Makefile
index 0c1421bbf2..b5e54b19fa 100644
--- a/usr/src/lib/libc/amd64/Makefile
+++ b/usr/src/lib/libc/amd64/Makefile
@@ -863,6 +863,7 @@ PORTSYS=			\
 	chmod.o			\
 	chown.o			\
 	corectl.o		\
+	epoll.o			\
 	exacctsys.o		\
 	execl.o			\
 	execle.o		\
diff --git a/usr/src/lib/libc/i386/Makefile.com b/usr/src/lib/libc/i386/Makefile.com
index 9a76280c0a..d7e77502f2 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		\
+	epoll.o			\
 	eventfd.o		\
 	exacctsys.o		\
 	execl.o			\
diff --git a/usr/src/lib/libc/port/mapfile-vers b/usr/src/lib/libc/port/mapfile-vers
index 0b683fc923..017c7c31bc 100644
--- a/usr/src/lib/libc/port/mapfile-vers
+++ b/usr/src/lib/libc/port/mapfile-vers
@@ -93,6 +93,15 @@ $if _x86 && _ELF64
 $add amd64
 $endif
 
+SYMBOL_VERSION ILLUMOS_0.15 {	# epoll(3C)
+    protected:
+	epoll_create;
+	epoll_create1;
+	epoll_ctl;
+	epoll_wait;
+	epoll_pwait;
+} ILLUMOS_0.14;
+
 SYMBOL_VERSION ILLUMOS_0.14 {	# strerror_l
     protected:
 	strerror_l;
diff --git a/usr/src/lib/libc/port/sys/epoll.c b/usr/src/lib/libc/port/sys/epoll.c
new file mode 100644
index 0000000000..93379b583e
--- /dev/null
+++ b/usr/src/lib/libc/port/sys/epoll.c
@@ -0,0 +1,207 @@
+/*
+ * 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) 2014, Joyent, Inc.  All rights reserved.
+ */
+
+#include <sys/types.h>
+#include <sys/epoll.h>
+#include <sys/devpoll.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+
+/*
+ * Events that match their epoll(7) equivalents.
+ */
+#if EPOLLIN != POLLIN
+#error value of EPOLLIN does not match value of POLLIN
+#endif
+
+#if EPOLLPRI != POLLPRI
+#error value of EPOLLPRI does not match value of POLLPRI
+#endif
+
+#if EPOLLOUT != POLLOUT
+#error value of EPOLLOUT does not match value of POLLOUT
+#endif
+
+#if EPOLLRDNORM != POLLRDNORM
+#error value of EPOLLRDNORM does not match value of POLLRDNORM
+#endif
+
+#if EPOLLRDBAND != POLLRDBAND
+#error value of EPOLLRDBAND does not match value of POLLRDBAND
+#endif
+
+#if EPOLLERR != POLLERR
+#error value of EPOLLERR does not match value of POLLERR
+#endif
+
+#if EPOLLHUP != POLLHUP
+#error value of EPOLLHUP does not match value of POLLHUP
+#endif
+
+/*
+ * Events that we ignore entirely.  They can be set in events, but they will
+ * never be returned.
+ */
+#define	EPOLLIGNORED 	(EPOLLMSG | EPOLLWAKEUP)
+
+/*
+ * Events that we swizzle into other bit positions.
+ */
+#define	EPOLLSWIZZLED	\
+	(EPOLLRDHUP | EPOLLONESHOT | EPOLLET | EPOLLWRBAND | EPOLLWRNORM)
+
+int
+epoll_create(int size)
+{
+	int fd;
+
+	/*
+	 * From the epoll_create() man page:  "Since Linux 2.6.8, the size
+	 * argument is ignored, but must be greater than zero."  You keep using
+	 * that word "ignored"...
+	 */
+	if (size <= 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	if ((fd = open("/dev/poll", O_RDWR)) == -1)
+		return (-1);
+
+	if (ioctl(fd, DP_EPOLLCOMPAT, 0) == -1) {
+		(void) close(fd);
+		return (-1);
+	}
+
+	return (fd);
+}
+
+int
+epoll_create1(int flags)
+{
+	int fd, oflags = O_RDWR;
+
+	if (flags & EPOLL_CLOEXEC)
+		oflags |= O_CLOEXEC;
+
+	if ((fd = open("/dev/poll", oflags)) == -1)
+		return (-1);
+
+	if (ioctl(fd, DP_EPOLLCOMPAT, 0) == -1) {
+		(void) close(fd);
+		return (-1);
+	}
+
+	return (fd);
+}
+
+int
+epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
+{
+	dvpoll_epollfd_t epoll[2];
+	uint32_t events, ev = 0;
+	int i = 0;
+
+	epoll[i].dpep_pollfd.fd = fd;
+
+	switch (op) {
+	case EPOLL_CTL_DEL:
+		ev = POLLREMOVE;
+		break;
+
+	case EPOLL_CTL_MOD:
+		/*
+		 * In the modify case, we pass down two events:  one to
+		 * remove the event and another to add it back.
+		 */
+		epoll[i++].dpep_pollfd.events = POLLREMOVE;
+		epoll[i].dpep_pollfd.fd = fd;
+		/* FALLTHROUGH */
+
+	case EPOLL_CTL_ADD:
+		/*
+		 * Mask off the events that we ignore, and then swizzle the
+		 * events for which our values differ from their epoll(7)
+		 * equivalents.
+		 */
+		events = event->events;
+		ev = events & ~(EPOLLIGNORED | EPOLLSWIZZLED);
+
+		if (events & EPOLLRDHUP)
+			ev |= POLLRDHUP;
+
+		if (events & EPOLLET)
+			ev |= POLLET;
+
+		if (events & EPOLLONESHOT)
+			ev |= POLLONESHOT;
+
+		if (events & EPOLLWRNORM)
+			ev |= POLLWRNORM;
+
+		if (events & EPOLLWRBAND)
+			ev |= POLLWRBAND;
+
+		epoll[i].dpep_data = event->data.u64;
+		break;
+
+	default:
+		errno = EOPNOTSUPP;
+		return (-1);
+	}
+
+	epoll[i].dpep_pollfd.events = ev;
+
+	return (write(epfd, epoll, sizeof (epoll[0]) * (i + 1)) == -1 ? -1 : 0);
+}
+
+int
+epoll_wait(int epfd, struct epoll_event *events,
+    int maxevents, int timeout)
+{
+	struct dvpoll arg;
+
+	if (maxevents <= 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	arg.dp_nfds = maxevents;
+	arg.dp_timeout = timeout;
+	arg.dp_fds = (pollfd_t *)events;
+
+	return (ioctl(epfd, DP_POLL, &arg));
+}
+
+int
+epoll_pwait(int epfd, struct epoll_event *events,
+    int maxevents, int timeout, const sigset_t *sigmask)
+{
+	struct dvpoll arg;
+
+	if (maxevents <= 0) {
+		errno = EINVAL;
+		return (-1);
+	}
+
+	arg.dp_nfds = maxevents;
+	arg.dp_timeout = timeout;
+	arg.dp_fds = (pollfd_t *)events;
+	arg.dp_setp = (sigset_t *)sigmask;
+
+	return (ioctl(epfd, DP_PPOLL, &arg));
+}
diff --git a/usr/src/lib/libc/sparc/Makefile.com b/usr/src/lib/libc/sparc/Makefile.com
index 3856c5332c..dc965fe6ac 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		\
+	epoll.o			\
 	eventfd.o		\
 	exacctsys.o		\
 	execl.o			\
diff --git a/usr/src/lib/libc/sparcv9/Makefile.com b/usr/src/lib/libc/sparcv9/Makefile.com
index 1a65ab7680..415aaf2be2 100644
--- a/usr/src/lib/libc/sparcv9/Makefile.com
+++ b/usr/src/lib/libc/sparcv9/Makefile.com
@@ -882,6 +882,7 @@ PORTSYS=			\
 	chown.o			\
 	corectl.o		\
 	eventfd.o		\
+	epoll.o			\
 	exacctsys.o		\
 	execl.o			\
 	execle.o		\