1 files changed, 170 insertions, 253 deletions

diff --git a/sys/dev/filemon/filemon_wrapper.c b/sys/dev/filemon/filemon_wrapper.c
index 6911dc5..87c9392 100644
--- a/sys/dev/filemon/filemon_wrapper.c
+++ b/sys/dev/filemon/filemon_wrapper.c
@@ -1,7 +1,7 @@
 /*-
  * Copyright (c) 2011, David E. O'Brien.
  * Copyright (c) 2009-2011, Juniper Networks, Inc.
- * Copyright (c) 2015, EMC Corp.
+ * Copyright (c) 2015-2016, EMC Corp.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -29,8 +29,9 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <sys/imgact.h>
 #include <sys/eventhandler.h>
+#include <sys/filedesc.h>
+#include <sys/imgact.h>
 #include <sys/sx.h>
 #include <sys/vnode.h>
 
@@ -45,6 +46,7 @@ filemon_output(struct filemon *filemon, char *msg, size_t len)
 {
 	struct uio auio;
 	struct iovec aiov;
+	int error;
 
 	if (filemon->fp == NULL)
 		return;
@@ -62,56 +64,33 @@ filemon_output(struct filemon *filemon, char *msg, size_t len)
 	if (filemon->fp->f_type == DTYPE_VNODE)
 		bwillwrite();
 
-	fo_write(filemon->fp, &auio, curthread->td_ucred, 0, curthread);
-}
-
-static struct filemon *
-filemon_pid_check(struct proc *p)
-{
-	struct filemon *filemon;
-
-	filemon_lock_read();
-	if (TAILQ_EMPTY(&filemons_inuse)) {
-		filemon_unlock_read();
-		return (NULL);
-	}
-	sx_slock(&proctree_lock);
-	while (p->p_pid != 0) {
-		TAILQ_FOREACH(filemon, &filemons_inuse, link) {
-			if (p == filemon->p) {
-				sx_sunlock(&proctree_lock);
-				sx_xlock(&filemon->lock);
-				filemon_unlock_read();
-				return (filemon);
-			}
-		}
-		p = proc_realparent(p);
-	}
-	sx_sunlock(&proctree_lock);
-	filemon_unlock_read();
-	return (NULL);
+	error = fo_write(filemon->fp, &auio, curthread->td_ucred, 0, curthread);
+	if (error != 0)
+		filemon->error = error;
 }
 
 static int
 filemon_wrapper_chdir(struct thread *td, struct chdir_args *uap)
 {
-	int ret;
-	size_t done;
+	int error, ret;
 	size_t len;
 	struct filemon *filemon;
 
 	if ((ret = sys_chdir(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
+		if ((filemon = filemon_proc_get(curproc)) != NULL) {
+			if ((error = copyinstr(uap->path, filemon->fname1,
+			    sizeof(filemon->fname1), NULL)) != 0) {
+				filemon->error = error;
+				goto copyfail;
+			}
 
 			len = snprintf(filemon->msgbufr,
 			    sizeof(filemon->msgbufr), "C %d %s\n",
 			    curproc->p_pid, filemon->fname1);
 
 			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
+copyfail:
+			filemon_drop(filemon);
 		}
 	}
 
@@ -126,12 +105,11 @@ filemon_event_process_exec(void *arg __unused, struct proc *p,
 	char *fullpath, *freepath;
 	size_t len;
 
-	if ((filemon = filemon_pid_check(p)) != NULL) {
+	if ((filemon = filemon_proc_get(p)) != NULL) {
 		fullpath = "<unknown>";
 		freepath = NULL;
 
-		vn_fullpath(FIRST_THREAD_IN_PROC(p), imgp->vp, &fullpath,
-		    &freepath);
+		vn_fullpath(curthread, imgp->vp, &fullpath, &freepath);
 
 		len = snprintf(filemon->msgbufr,
 		    sizeof(filemon->msgbufr), "E %d %s\n",
@@ -139,321 +117,244 @@ filemon_event_process_exec(void *arg __unused, struct proc *p,
 
 		filemon_output(filemon, filemon->msgbufr, len);
 
-		sx_xunlock(&filemon->lock);
+		filemon_drop(filemon);
 
 		free(freepath, M_TEMP);
 	}
 }
 
-static int
-filemon_wrapper_open(struct thread *td, struct open_args *uap)
+static void
+_filemon_wrapper_openat(struct thread *td, char *upath, int flags, int fd)
 {
-	int ret;
-	size_t done;
+	int error;
 	size_t len;
+	struct file *fp;
 	struct filemon *filemon;
+	char *atpath, *freepath;
+	cap_rights_t rights;
 
-	if ((ret = sys_open(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-
-			if (uap->flags & O_RDWR) {
-				/*
-				 * We'll get the W record below, but need
-				 * to also output an R to distingish from
-				 * O_WRONLY.
-				 */
-				len = snprintf(filemon->msgbufr,
-				    sizeof(filemon->msgbufr), "R %d %s\n",
-				    curproc->p_pid, filemon->fname1);
-				filemon_output(filemon, filemon->msgbufr, len);
-			}
+	if ((filemon = filemon_proc_get(curproc)) != NULL) {
+		atpath = "";
+		freepath = NULL;
+		fp = NULL;
 
+		if ((error = copyinstr(upath, filemon->fname1,
+		    sizeof(filemon->fname1), NULL)) != 0) {
+			filemon->error = error;
+			goto copyfail;
+		}
 
+		if (filemon->fname1[0] != '/' && fd != AT_FDCWD) {
+			/*
+			 * rats - we cannot do too much about this.
+			 * the trace should show a dir we read
+			 * recently.. output an A record as a clue
+			 * until we can do better.
+			 * XXX: This may be able to come out with
+			 * the namecache lookup now.
+			 */
 			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "%c %d %s\n",
-			    (uap->flags & O_ACCMODE) ? 'W':'R',
+			    sizeof(filemon->msgbufr), "A %d %s\n",
 			    curproc->p_pid, filemon->fname1);
 			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
+			/*
+			 * Try to resolve the path from the vnode using the
+			 * namecache.  It may be inaccurate, but better
+			 * than nothing.
+			 */
+			if (getvnode(td, fd,
+			    cap_rights_init(&rights, CAP_LOOKUP), &fp) == 0) {
+				vn_fullpath(td, fp->f_vnode, &atpath,
+				    &freepath);
+			}
+		}
+		if (flags & O_RDWR) {
+			/*
+			 * We'll get the W record below, but need
+			 * to also output an R to distinguish from
+			 * O_WRONLY.
+			 */
+			len = snprintf(filemon->msgbufr,
+			    sizeof(filemon->msgbufr), "R %d %s%s%s\n",
+			    curproc->p_pid, atpath,
+			    atpath[0] != '\0' ? "/" : "", filemon->fname1);
+			filemon_output(filemon, filemon->msgbufr, len);
 		}
-	}
 
-	return (ret);
+		len = snprintf(filemon->msgbufr,
+		    sizeof(filemon->msgbufr), "%c %d %s%s%s\n",
+		    (flags & O_ACCMODE) ? 'W':'R',
+		    curproc->p_pid, atpath,
+		    atpath[0] != '\0' ? "/" : "", filemon->fname1);
+		filemon_output(filemon, filemon->msgbufr, len);
+copyfail:
+		filemon_drop(filemon);
+		if (fp != NULL)
+			fdrop(fp, td);
+		free(freepath, M_TEMP);
+	}
 }
 
 static int
-filemon_wrapper_openat(struct thread *td, struct openat_args *uap)
+filemon_wrapper_open(struct thread *td, struct open_args *uap)
 {
 	int ret;
-	size_t done;
-	size_t len;
-	struct filemon *filemon;
 
-	if ((ret = sys_openat(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-
-			filemon->fname2[0] = '\0';
-			if (filemon->fname1[0] != '/' && uap->fd != AT_FDCWD) {
-				/*
-				 * rats - we cannot do too much about this.
-				 * the trace should show a dir we read
-				 * recently.. output an A record as a clue
-				 * until we can do better.
-				 */
-				len = snprintf(filemon->msgbufr,
-				    sizeof(filemon->msgbufr), "A %d %s\n",
-				    curproc->p_pid, filemon->fname1);
-				filemon_output(filemon, filemon->msgbufr, len);
-			}
-			if (uap->flag & O_RDWR) {
-				/*
-				 * We'll get the W record below, but need
-				 * to also output an R to distingish from
-				 * O_WRONLY.
-				 */
-				len = snprintf(filemon->msgbufr,
-				    sizeof(filemon->msgbufr), "R %d %s%s\n",
-				    curproc->p_pid, filemon->fname2, filemon->fname1);
-				filemon_output(filemon, filemon->msgbufr, len);
-			}
-
-
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "%c %d %s%s\n",
-			    (uap->flag & O_ACCMODE) ? 'W':'R',
-			    curproc->p_pid, filemon->fname2, filemon->fname1);
-			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
-		}
-	}
+	if ((ret = sys_open(td, uap)) == 0)
+		_filemon_wrapper_openat(td, uap->path, uap->flags, AT_FDCWD);
 
 	return (ret);
 }
 
 static int
-filemon_wrapper_rename(struct thread *td, struct rename_args *uap)
+filemon_wrapper_openat(struct thread *td, struct openat_args *uap)
 {
 	int ret;
-	size_t done;
-	size_t len;
-	struct filemon *filemon;
 
-	if ((ret = sys_rename(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->from, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-			copyinstr(uap->to, filemon->fname2,
-			    sizeof(filemon->fname2), &done);
-
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "M %d '%s' '%s'\n",
-			    curproc->p_pid, filemon->fname1, filemon->fname2);
-
-			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
-		}
-	}
+	if ((ret = sys_openat(td, uap)) == 0)
+		_filemon_wrapper_openat(td, uap->path, uap->flag, uap->fd);
 
 	return (ret);
 }
 
 static int
-filemon_wrapper_link(struct thread *td, struct link_args *uap)
+filemon_wrapper_rename(struct thread *td, struct rename_args *uap)
 {
-	int ret;
-	size_t done;
+	int error, ret;
 	size_t len;
 	struct filemon *filemon;
 
-	if ((ret = sys_link(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-			copyinstr(uap->link, filemon->fname2,
-			    sizeof(filemon->fname2), &done);
+	if ((ret = sys_rename(td, uap)) == 0) {
+		if ((filemon = filemon_proc_get(curproc)) != NULL) {
+			if (((error = copyinstr(uap->from, filemon->fname1,
+			     sizeof(filemon->fname1), NULL)) != 0) ||
+			    ((error = copyinstr(uap->to, filemon->fname2,
+			     sizeof(filemon->fname2), NULL)) != 0)) {
+				filemon->error = error;
+				goto copyfail;
+			}
 
 			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "L %d '%s' '%s'\n",
+			    sizeof(filemon->msgbufr), "M %d '%s' '%s'\n",
 			    curproc->p_pid, filemon->fname1, filemon->fname2);
 
 			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
+copyfail:
+			filemon_drop(filemon);
 		}
 	}
 
 	return (ret);
 }
 
-static int
-filemon_wrapper_symlink(struct thread *td, struct symlink_args *uap)
+static void
+_filemon_wrapper_link(struct thread *td, char *upath1, char *upath2)
 {
-	int ret;
-	size_t done;
-	size_t len;
 	struct filemon *filemon;
+	size_t len;
+	int error;
+
+	if ((filemon = filemon_proc_get(curproc)) != NULL) {
+		if (((error = copyinstr(upath1, filemon->fname1,
+		     sizeof(filemon->fname1), NULL)) != 0) ||
+		    ((error = copyinstr(upath2, filemon->fname2,
+		     sizeof(filemon->fname2), NULL)) != 0)) {
+			filemon->error = error;
+			goto copyfail;
+		}
 
-	if ((ret = sys_symlink(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-			copyinstr(uap->link, filemon->fname2,
-			    sizeof(filemon->fname2), &done);
-
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "L %d '%s' '%s'\n",
-			    curproc->p_pid, filemon->fname1, filemon->fname2);
-
-			filemon_output(filemon, filemon->msgbufr, len);
+		len = snprintf(filemon->msgbufr,
+		    sizeof(filemon->msgbufr), "L %d '%s' '%s'\n",
+		    curproc->p_pid, filemon->fname1, filemon->fname2);
 
-			sx_xunlock(&filemon->lock);
-		}
+		filemon_output(filemon, filemon->msgbufr, len);
+copyfail:
+		filemon_drop(filemon);
 	}
-
-	return (ret);
 }
 
 static int
-filemon_wrapper_linkat(struct thread *td, struct linkat_args *uap)
+filemon_wrapper_link(struct thread *td, struct link_args *uap)
 {
 	int ret;
-	size_t done;
-	size_t len;
-	struct filemon *filemon;
-
-	if ((ret = sys_linkat(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path1, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-			copyinstr(uap->path2, filemon->fname2,
-			    sizeof(filemon->fname2), &done);
-
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "L %d '%s' '%s'\n",
-			    curproc->p_pid, filemon->fname1, filemon->fname2);
 
-			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
-		}
-	}
+	if ((ret = sys_link(td, uap)) == 0)
+		_filemon_wrapper_link(td, uap->path, uap->link);
 
 	return (ret);
 }
 
 static int
-filemon_wrapper_stat(struct thread *td, struct stat_args *uap)
+filemon_wrapper_symlink(struct thread *td, struct symlink_args *uap)
 {
 	int ret;
-	size_t done;
-	size_t len;
-	struct filemon *filemon;
 
-	if ((ret = sys_stat(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "S %d %s\n",
-			    curproc->p_pid, filemon->fname1);
-
-			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
-		}
-	}
+	if ((ret = sys_symlink(td, uap)) == 0)
+		_filemon_wrapper_link(td, uap->path, uap->link);
 
 	return (ret);
 }
 
-#if defined(COMPAT_IA32) || defined(COMPAT_FREEBSD32) || defined(COMPAT_ARCH32)
 static int
-filemon_wrapper_freebsd32_stat(struct thread *td,
-    struct freebsd32_stat_args *uap)
+filemon_wrapper_linkat(struct thread *td, struct linkat_args *uap)
 {
 	int ret;
-	size_t done;
-	size_t len;
-	struct filemon *filemon;
-
-	if ((ret = freebsd32_stat(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
-
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr), "S %d %s\n",
-			    curproc->p_pid, filemon->fname1);
-
-			filemon_output(filemon, filemon->msgbufr, len);
 
-			sx_xunlock(&filemon->lock);
-		}
-	}
+	if ((ret = sys_linkat(td, uap)) == 0)
+		_filemon_wrapper_link(td, uap->path1, uap->path2);
 
 	return (ret);
 }
-#endif
 
 static void
 filemon_event_process_exit(void *arg __unused, struct proc *p)
 {
 	size_t len;
 	struct filemon *filemon;
-	struct timeval now;
 
-	/* Get timestamp before locking. */
-	getmicrotime(&now);
-
-	if ((filemon = filemon_pid_check(p)) != NULL) {
+	if ((filemon = filemon_proc_get(p)) != NULL) {
 		len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr),
 		    "X %d %d %d\n", p->p_pid, p->p_xexit, p->p_xsig);
 
 		filemon_output(filemon, filemon->msgbufr, len);
 
-		/* Check if the monitored process is about to exit. */
-		if (filemon->p == p) {
-			len = snprintf(filemon->msgbufr,
-			    sizeof(filemon->msgbufr),
-			    "# Stop %ju.%06ju\n# Bye bye\n",
-			    (uintmax_t)now.tv_sec, (uintmax_t)now.tv_usec);
-
-			filemon_output(filemon, filemon->msgbufr, len);
-			filemon->p = NULL;
-		}
-
-		sx_xunlock(&filemon->lock);
+		/*
+		 * filemon_untrack_processes() may have dropped this p_filemon
+		 * already while in filemon_proc_get() before acquiring the
+		 * filemon lock.
+		 */
+		KASSERT(p->p_filemon == NULL || p->p_filemon == filemon,
+		    ("%s: p %p was attached while exiting, expected "
+		    "filemon %p or NULL", __func__, p, filemon));
+		if (p->p_filemon == filemon)
+			filemon_proc_drop(p);
+
+		filemon_drop(filemon);
 	}
 }
 
 static int
 filemon_wrapper_unlink(struct thread *td, struct unlink_args *uap)
 {
-	int ret;
-	size_t done;
+	int error, ret;
 	size_t len;
 	struct filemon *filemon;
 
 	if ((ret = sys_unlink(td, uap)) == 0) {
-		if ((filemon = filemon_pid_check(curproc)) != NULL) {
-			copyinstr(uap->path, filemon->fname1,
-			    sizeof(filemon->fname1), &done);
+		if ((filemon = filemon_proc_get(curproc)) != NULL) {
+			if ((error = copyinstr(uap->path, filemon->fname1,
+			    sizeof(filemon->fname1), NULL)) != 0) {
+				filemon->error = error;
+				goto copyfail;
+			}
 
 			len = snprintf(filemon->msgbufr,
 			    sizeof(filemon->msgbufr), "D %d %s\n",
 			    curproc->p_pid, filemon->fname1);
 
 			filemon_output(filemon, filemon->msgbufr, len);
-
-			sx_xunlock(&filemon->lock);
+copyfail:
+			filemon_drop(filemon);
 		}
 	}
 
@@ -467,14 +368,34 @@ filemon_event_process_fork(void *arg __unused, struct proc *p1,
 	size_t len;
 	struct filemon *filemon;
 
-	if ((filemon = filemon_pid_check(p1)) != NULL) {
+	if ((filemon = filemon_proc_get(p1)) != NULL) {
 		len = snprintf(filemon->msgbufr,
 		    sizeof(filemon->msgbufr), "F %d %d\n",
 		    p1->p_pid, p2->p_pid);
 
 		filemon_output(filemon, filemon->msgbufr, len);
 
-		sx_xunlock(&filemon->lock);
+		/*
+		 * filemon_untrack_processes() or
+		 * filemon_ioctl(FILEMON_SET_PID) may have changed the parent's
+		 * p_filemon while in filemon_proc_get() before acquiring the
+		 * filemon lock.  Only inherit if the parent is still traced by
+		 * this filemon.
+		 */
+		if (p1->p_filemon == filemon) {
+			PROC_LOCK(p2);
+			/*
+			 * It may have been attached to already by a new
+			 * filemon.
+			 */
+			if (p2->p_filemon == NULL) {
+				p2->p_filemon = filemon_acquire(filemon);
+				++filemon->proccnt;
+			}
+			PROC_UNLOCK(p2);
+		}
+
+		filemon_drop(filemon);
 	}
 }
 
@@ -491,7 +412,6 @@ filemon_wrapper_install(void)
 	sv_table[SYS_open].sy_call = (sy_call_t *) filemon_wrapper_open;
 	sv_table[SYS_openat].sy_call = (sy_call_t *) filemon_wrapper_openat;
 	sv_table[SYS_rename].sy_call = (sy_call_t *) filemon_wrapper_rename;
-	sv_table[SYS_stat].sy_call = (sy_call_t *) filemon_wrapper_stat;
 	sv_table[SYS_unlink].sy_call = (sy_call_t *) filemon_wrapper_unlink;
 	sv_table[SYS_link].sy_call = (sy_call_t *) filemon_wrapper_link;
 	sv_table[SYS_symlink].sy_call = (sy_call_t *) filemon_wrapper_symlink;
@@ -504,7 +424,6 @@ filemon_wrapper_install(void)
 	sv_table[FREEBSD32_SYS_open].sy_call = (sy_call_t *) filemon_wrapper_open;
 	sv_table[FREEBSD32_SYS_openat].sy_call = (sy_call_t *) filemon_wrapper_openat;
 	sv_table[FREEBSD32_SYS_rename].sy_call = (sy_call_t *) filemon_wrapper_rename;
-	sv_table[FREEBSD32_SYS_freebsd32_stat].sy_call = (sy_call_t *) filemon_wrapper_freebsd32_stat;
 	sv_table[FREEBSD32_SYS_unlink].sy_call = (sy_call_t *) filemon_wrapper_unlink;
 	sv_table[FREEBSD32_SYS_link].sy_call = (sy_call_t *) filemon_wrapper_link;
 	sv_table[FREEBSD32_SYS_symlink].sy_call = (sy_call_t *) filemon_wrapper_symlink;
@@ -532,7 +451,6 @@ filemon_wrapper_deinstall(void)
 	sv_table[SYS_open].sy_call = (sy_call_t *)sys_open;
 	sv_table[SYS_openat].sy_call = (sy_call_t *)sys_openat;
 	sv_table[SYS_rename].sy_call = (sy_call_t *)sys_rename;
-	sv_table[SYS_stat].sy_call = (sy_call_t *)sys_stat;
 	sv_table[SYS_unlink].sy_call = (sy_call_t *)sys_unlink;
 	sv_table[SYS_link].sy_call = (sy_call_t *)sys_link;
 	sv_table[SYS_symlink].sy_call = (sy_call_t *)sys_symlink;
@@ -545,7 +463,6 @@ filemon_wrapper_deinstall(void)
 	sv_table[FREEBSD32_SYS_open].sy_call = (sy_call_t *)sys_open;
 	sv_table[FREEBSD32_SYS_openat].sy_call = (sy_call_t *)sys_openat;
 	sv_table[FREEBSD32_SYS_rename].sy_call = (sy_call_t *)sys_rename;
-	sv_table[FREEBSD32_SYS_freebsd32_stat].sy_call = (sy_call_t *)freebsd32_stat;
 	sv_table[FREEBSD32_SYS_unlink].sy_call = (sy_call_t *)sys_unlink;
 	sv_table[FREEBSD32_SYS_link].sy_call = (sy_call_t *)sys_link;
 	sv_table[FREEBSD32_SYS_symlink].sy_call = (sy_call_t *)sys_symlink;