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| author | Ulrich Drepper <drepper@redhat.com> | 2000-04-10 05:25:42 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2000-04-10 05:25:42 +0000 |
| commit | 4186c9f42b68947cfba27abfcd021da7755bf4eb (patch) | |
| tree | 3f57dfa187c70dffdb73d42b85700057e5abf66d /sysdeps/unix/sysv/linux/getdents.c | |
| parent | 8956ac9e979f950559b0b2d4f8a0726c70ceee8e (diff) | |
| download | glibc-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.c | 12 |
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) |