kernel: poll system and poll syscall

kernel-src/fs/devfs.c

@@ -145,7 +145,7 @@ int devfs_setattr(vnode_t *node, vattr_t *attr, cred_t *cred) {
 	return 0;
 }
 
-int devfs_poll(vnode_t *node, int events) {
+int devfs_poll(vnode_t *node, polldata_t *data, int events) {
 	devnode_t *devnode = (devnode_t *)node;
 	if (devnode->master)
 		devnode = devnode->master;
@@ -153,7 +153,7 @@ int devfs_poll(vnode_t *node, int events) {
 	if (devnode->devops->poll == NULL)
 		return ENODEV;
 
-	return devnode->devops->poll(devnode->attr.rdevminor, events);
+	return devnode->devops->poll(devnode->attr.rdevminor, data, events);
 }
 
 int devfs_mmap(vnode_t *node, void *addr, uintmax_t offset, int flags, cred_t *cred) {

kernel-src/fs/pipefs.c

@@ -7,6 +7,7 @@
 #include <logging.h>
 #include <errno.h>
 #include <kernel/abi.h>
+#include <kernel/poll.h>
 
 #define BUFFER_SIZE 16 * PAGE_SIZE
 
@@ -147,7 +148,7 @@ int pipefs_write(vnode_t *node, void *buffer, size_t size, uintmax_t offset, int
 	return error;
 }
 
-int pipefs_poll(vnode_t *node, int events) {
+int pipefs_poll(vnode_t *node, polldata_t *data, int events) {
 	pipenode_t *pipenode = (pipenode_t *)node;
 	int revents = 0;
 	VOP_LOCK(node);

kernel-src/fs/tmpfs.c

@@ -29,17 +29,6 @@ static int tmpfs_mount(vfs_t **vfs, vnode_t *mountpoint, vnode_t *backing, void
 	return 0;
 }
 
-static int tmpfs_poll(vnode_t *node, int event) {
-	int ret = 0;
-
-	if (event & POLLIN)
-		ret |= POLLIN;
-	if (event & POLLOUT)
-		ret |= POLLOUT;
-
-	return ret;
-}
-
 #define DATAMMUFLAGS (ARCH_MMU_FLAGS_WRITE | ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_NOEXEC)
 
 // expects to be called with node locked
@@ -491,7 +480,7 @@ static vops_t vnops = {
 	.getattr = tmpfs_getattr,
 	.setattr = tmpfs_setattr,
 	.lookup = tmpfs_lookup,
-	.poll = tmpfs_poll,
+	.poll = vfs_pollstub,
 	.read = tmpfs_read,
 	.write = tmpfs_write,
 	.access = tmpfs_access,

kernel-src/fs/vfs.c

@@ -5,6 +5,7 @@
 #include <kernel/alloc.h>
 #include <errno.h>
 #include <arch/cpu.h>
+#include <kernel/poll.h>
 
 #define PATHNAME_MAX 512
 #define MAXLINKDEPTH 64
@@ -27,6 +28,18 @@ static cred_t *getcred() {
 		return &_cpu()->thread->proc->cred;
 }
 
+int vfs_pollstub(vnode_t *node, struct polldata *, int events) {
+	int revents = 0;
+
+	if (events & POLLIN)
+		revents |= POLLIN;
+
+	if (events & POLLOUT)
+		revents |= POLLOUT;
+
+	return revents;
+}
+
 void vfs_init() {
 	__assert(hashtable_init(&fstable, 20) == 0);
 	vfsroot = alloc(sizeof(vnode_t));