about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/getdents.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>2000-04-10 05:25:42 +0000
committerUlrich Drepper <drepper@redhat.com>2000-04-10 05:25:42 +0000
commit4186c9f42b68947cfba27abfcd021da7755bf4eb (patch)
tree3f57dfa187c70dffdb73d42b85700057e5abf66d /sysdeps/unix/sysv/linux/getdents.c
parent8956ac9e979f950559b0b2d4f8a0726c70ceee8e (diff)
downloadglibc-4186c9f42b68947cfba27abfcd021da7755bf4eb.tar.gz
glibc-4186c9f42b68947cfba27abfcd021da7755bf4eb.tar.xz
glibc-4186c9f42b68947cfba27abfcd021da7755bf4eb.zip
Update.
	* sysdeps/unix/sysv/linux/getdents.c (__getdents): Avoid initial
	lseek call be passing in a buffer which never allow a successful
	first getdents syscall if not at leas the initial entry can be
	stored in the user buffer.
Diffstat (limited to 'sysdeps/unix/sysv/linux/getdents.c')
-rw-r--r--sysdeps/unix/sysv/linux/getdents.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/sysdeps/unix/sysv/linux/getdents.c b/sysdeps/unix/sysv/linux/getdents.c
index d142843cbe..5f1e7c1b30 100644
--- a/sysdeps/unix/sysv/linux/getdents.c
+++ b/sysdeps/unix/sysv/linux/getdents.c
@@ -17,6 +17,7 @@
    Boston, MA 02111-1307, USA.  */
 
 #include <alloca.h>
+#include <assert.h>
 #include <errno.h>
 #include <dirent.h>
 #include <stddef.h>
@@ -33,7 +34,7 @@
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 
 
-extern int __syscall_getdents __P ((int fd, char *buf, size_t nbytes));
+extern int __syscall_getdents (int fd, char *buf, size_t nbytes);
 
 /* For Linux we need a special version of this file since the
    definition of `struct dirent' is not the same for the kernel and
@@ -67,7 +68,7 @@ ssize_t
 internal_function
 __getdents (int fd, char *buf, size_t nbytes)
 {
-  off_t last_offset = __lseek (fd, 0, SEEK_CUR);
+  off_t last_offset = -1;
   size_t red_nbytes;
   struct kernel_dirent *skdp, *kdp;
   struct dirent *dp;
@@ -75,8 +76,10 @@ __getdents (int fd, char *buf, size_t nbytes)
   const size_t size_diff = (offsetof (struct dirent, d_name)
 			    - offsetof (struct kernel_dirent, d_name));
 
-  red_nbytes = nbytes - ((nbytes / (offsetof (struct dirent, d_name) + 14))
-			 * size_diff);
+  red_nbytes = MIN (nbytes
+		    - ((nbytes / (offsetof (struct dirent, d_name) + 14))
+		       * size_diff),
+		    nbytes - size_diff);
 
   dp = (struct dirent *) buf;
   skdp = kdp = __alloca (red_nbytes);
@@ -97,6 +100,7 @@ __getdents (int fd, char *buf, size_t nbytes)
 	{
 	  /* Our heuristic failed.  We read too many entries.  Reset
 	     the stream.  */
+	  assert (last_offset != -1);
 	  __lseek (fd, last_offset, SEEK_SET);
 
 	  if ((char *) dp == buf)