X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/2b4b57cde32cd59d62925e7cfa02dc478cde4624..32f555bf0f396f114033687e04d0e47c1d1457af:/usr/src/sys/ufs/lfs/lfs_vnops.c

diff --git a/usr/src/sys/ufs/lfs/lfs_vnops.c b/usr/src/sys/ufs/lfs/lfs_vnops.c
index b155f1627c..97ba1db405 100644
--- a/usr/src/sys/ufs/lfs/lfs_vnops.c
+++ b/usr/src/sys/ufs/lfs/lfs_vnops.c
@@ -1,4 +1,4 @@
-/*	lfs_vnops.c	4.15	81/11/18	*/
+/*	lfs_vnops.c	4.20	82/03/16	*/
 
 #include "../h/param.h"
 #include "../h/systm.h"
@@ -39,7 +39,7 @@ fstat()
 }
 
 /*
- * Stat system call.
+ * Stat system call.  This version does not follow links.
  */
 stat()
 {
@@ -50,7 +50,26 @@ stat()
 	} *uap;
 
 	uap = (struct a *)u.u_ap;
-	ip = namei(uchar, 0);
+	ip = namei(uchar, 0, 0);
+	if (ip == NULL)
+		return;
+	stat1(ip, uap->sb);
+	iput(ip);
+}
+
+/*
+ * Lstat system call.  This version does follow links.
+ */
+lstat()
+{
+	register struct inode *ip;
+	register struct a {
+		char	*fname;
+		struct stat *sb;
+	} *uap;
+
+	uap = (struct a *)u.u_ap;
+	ip = namei(uchar, 0, 1);
 	if (ip == NULL)
 		return;
 	stat1(ip, uap->sb);
@@ -82,7 +101,7 @@ stat1(ip, ub)
 	ds.st_rdev = (dev_t)ip->i_un.i_rdev;
 	ds.st_size = ip->i_size;
 	/*
-	 * Next the dates in the disk
+	 * next the dates in the disk
 	 */
 	bp = bread(ip->i_dev, itod(ip->i_number));
 	dp = bp->b_un.b_dino;
@@ -96,7 +115,81 @@ stat1(ip, ub)
 }
 
 /*
- * Dup system call.
+ * Return target name of a symbolic link
+ */
+readlink()
+{
+	register struct inode *ip;
+	register struct a {
+		char	*name;
+		char	*buf;
+		int	count;
+	} *uap;
+
+	ip = namei(uchar, 0, 0);
+	if (ip == NULL)
+		return;
+	if ((ip->i_mode&IFMT) != IFLNK) {
+		u.u_error = ENXIO;
+		goto out;
+	}
+	uap = (struct a *)u.u_ap;
+	u.u_offset = 0;
+	u.u_base = uap->buf;
+	u.u_count = uap->count;
+	u.u_segflg = 0;
+	readi(ip);
+out:
+	iput(ip);
+	u.u_r.r_val1 = uap->count - u.u_count;
+}
+
+/*
+ * symlink -- make a symbolic link
+ */
+symlink()
+{
+	register struct a {
+		char	*target;
+		char	*linkname;
+	} *uap;
+	register struct inode *ip;
+	register char *tp;
+	register c, nc;
+
+	uap = (struct a *)u.u_ap;
+	tp = uap->target;
+	nc = 0;
+	while (c = fubyte(tp)) {
+		if (c < 0) {
+			u.u_error = EFAULT;
+			return;
+		}
+		tp++;
+		nc++;
+	}
+	u.u_dirp = uap->linkname;
+	ip = namei(uchar, 1, 0);
+	if (ip) {
+		iput(ip);
+		u.u_error = EEXIST;
+		return;
+	}
+	if (u.u_error)
+		return;
+	ip = maknode(IFLNK | 0777);
+	if (ip == NULL)
+		return;
+	u.u_base = uap->target;
+	u.u_count = nc;
+	u.u_offset = 0;
+	u.u_segflg = 0;
+	writei(ip);
+	iput(ip);
+}
+
+/*
+ * the dup system call.
  */
 dup()
 {
@@ -126,7 +219,9 @@ dup()
 	}
 	if (i != uap->fdes) {
 		if (u.u_ofile[i]!=NULL)
-			closef(u.u_ofile[i]);
+			closef(u.u_ofile[i], 0);
+		if (u.u_error)
+			return;
 		u.u_ofile[i] = fp;
 		fp->f_count++;
 	}
@@ -155,7 +250,7 @@ smount()
 	if (u.u_error)
 		return;
 	u.u_dirp = (caddr_t)uap->freg;
-	ip = namei(uchar, 0);
+	ip = namei(uchar, 0, 1);
 	if (ip == NULL)
 		return;
 	if (ip->i_count!=1 || (ip->i_mode&IFMT) != IFDIR)
@@ -224,7 +319,7 @@ sumount()
 	if (u.u_error)
 		return;
 	xumount(dev);	/* remove unused sticky files from text table */
-	update();
+	update(0);
 	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
 		if (mp->m_bufp != NULL && dev == mp->m_dev)
 			goto found;
@@ -270,7 +365,7 @@ getmdev()
 
 	if (!suser())
 		return(NODEV);
-	ip = namei(uchar, 0);
+	ip = namei(uchar, 0, 1);
 	if (ip == NULL)
 		return(NODEV);
 	if ((ip->i_mode&IFMT) != IFBLK)