diff options
Diffstat (limited to 'sysdeps/unix/sysv')
| -rw-r--r-- | sysdeps/unix/sysv/linux/Dist | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/Makefile | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/getdents.c | 37 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/getdirentries.c | 39 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/getdirentries64.c | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/readdir64.c | 9 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/readdir64_r.c | 9 |
7 files changed, 66 insertions, 34 deletions
diff --git a/sysdeps/unix/sysv/linux/Dist b/sysdeps/unix/sysv/linux/Dist index 6039e9ae0a..fca513d1b7 100644 --- a/sysdeps/unix/sysv/linux/Dist +++ b/sysdeps/unix/sysv/linux/Dist @@ -1,6 +1,8 @@ bits/pthreadtypes.h cmsg_nxthdr.c errlist.h +getdirentries.c +getdirentries64.c init-first.h kernel_sigaction.h kernel_stat.h diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 0a8f45448b..69c08ea902 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -97,7 +97,7 @@ endif inhibit-glue = yes ifeq ($(subdir),dirent) -sysdep_routines += getdents64 +sysdep_routines += getdents64 getdirentries getdirentries64 endif ifeq ($(subdir),nis) diff --git a/sysdeps/unix/sysv/linux/getdents.c b/sysdeps/unix/sysv/linux/getdents.c index e0180dfa2e..9a2255c0da 100644 --- a/sysdeps/unix/sysv/linux/getdents.c +++ b/sysdeps/unix/sysv/linux/getdents.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc. +/* Copyright (C) 1993, 95, 96, 97, 98, 99 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -51,22 +51,23 @@ struct kernel_dirent }; #ifdef GETDENTS64 -#define __getdirentries __getdirentries64 -#define dirent dirent64 +# define __getdents __getdents64 +# define dirent dirent64 #endif /* The problem here is that we cannot simply read the next NBYTES bytes. We need to take the additional field into account. We use some heuristic. Assuming the directory contains names with 14 - characters on average we can compute an estimate number of entries + characters on average we can compute an estimated number of entries which fit in the buffer. Taking this number allows us to specify a - correct number of bytes to read. If we should be wrong, we can reset - the file descriptor. */ + reasonable number of bytes to read. If we should be wrong, we can + reset the file descriptor. In practice the kernel is limiting the + amount of data returned much more then the reduced buffer size. */ ssize_t -__getdirentries (int fd, char *buf, size_t nbytes, off_t *basep) +internal_function +__getdents (int fd, char *buf, size_t nbytes) { - off_t base = __lseek (fd, (off_t) 0, SEEK_CUR); - off_t last_offset = base; + off_t last_offset = 0; size_t red_nbytes; struct kernel_dirent *skdp, *kdp; struct dirent *dp; @@ -84,7 +85,7 @@ __getdirentries (int fd, char *buf, size_t nbytes, off_t *basep) if (retval == -1) return -1; - + while ((char *) kdp < (char *) skdp + retval) { const size_t alignment = __alignof__ (struct dirent); @@ -95,8 +96,13 @@ __getdirentries (int fd, char *buf, size_t nbytes, off_t *basep) if ((char *) dp + new_reclen > buf + nbytes) { /* Our heuristic failed. We read too many entries. Reset - the stream. */ - __lseek (fd, last_offset, SEEK_SET); + the stream. `last_offset' contains the last known + position. If it is zero this is the first record we are + reading. In this case do a relative search. */ + if (last_offset == 0) + __lseek (fd, -retval, SEEK_CUR); + else + __lseek (fd, last_offset, SEEK_SET); break; } @@ -112,12 +118,5 @@ __getdirentries (int fd, char *buf, size_t nbytes, off_t *basep) kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen); } - if (basep) - *basep = base; - return (char *) dp - buf; } - -#ifndef GETDENTS64 -weak_alias (__getdirentries, getdirentries) -#endif diff --git a/sysdeps/unix/sysv/linux/getdirentries.c b/sysdeps/unix/sysv/linux/getdirentries.c new file mode 100644 index 0000000000..1f7ba85c55 --- /dev/null +++ b/sysdeps/unix/sysv/linux/getdirentries.c @@ -0,0 +1,39 @@ +/* Copyright (C) 1993, 95, 96, 97, 98, 99 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <dirent.h> +#include <unistd.h> + +#ifdef GETDENTS64 +# define getdirentries getdirentries64 +# define __getdents __getdents64 +#endif + +ssize_t +getdirentries (int fd, char *buf, size_t nbytes, off_t *basep) +{ + off_t base = __lseek (fd, (off_t) 0, SEEK_CUR); + ssize_t result; + + result = __getdents (fd, buf, nbytes); + + if (result != -1) + *basep = base; + + return result; +} diff --git a/sysdeps/unix/sysv/linux/getdirentries64.c b/sysdeps/unix/sysv/linux/getdirentries64.c new file mode 100644 index 0000000000..423e361e22 --- /dev/null +++ b/sysdeps/unix/sysv/linux/getdirentries64.c @@ -0,0 +1,2 @@ +#define GETDENTS64 1 +#include "getdirentries.c" diff --git a/sysdeps/unix/sysv/linux/readdir64.c b/sysdeps/unix/sysv/linux/readdir64.c index 710f934ebb..5a19e220aa 100644 --- a/sysdeps/unix/sysv/linux/readdir64.c +++ b/sysdeps/unix/sysv/linux/readdir64.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1997, 1998 Free Software Foundation, Inc. +/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -27,9 +27,6 @@ #include <dirstream.h> -extern ssize_t __getdirentries64 (int, char *, size_t, off_t *); - - /* Read a directory entry from DIRP. */ struct dirent64 * __readdir64 (DIR *dirp) @@ -47,7 +44,6 @@ __readdir64 (DIR *dirp) /* We've emptied out our buffer. Refill it. */ size_t maxread; - off_t base; ssize_t bytes; #ifndef _DIRENT_HAVE_D_RECLEN @@ -57,8 +53,7 @@ __readdir64 (DIR *dirp) maxread = dirp->allocation; #endif - base = dirp->filepos; - bytes = __getdirentries64 (dirp->fd, dirp->data, maxread, &base); + bytes = __getdents64 (dirp->fd, dirp->data, maxread); if (bytes <= 0) { dp = NULL; diff --git a/sysdeps/unix/sysv/linux/readdir64_r.c b/sysdeps/unix/sysv/linux/readdir64_r.c index 5e711c4787..a86ef7b8d2 100644 --- a/sysdeps/unix/sysv/linux/readdir64_r.c +++ b/sysdeps/unix/sysv/linux/readdir64_r.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1997, 1998 Free Software Foundation, Inc. +/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -27,9 +27,6 @@ #include <dirstream.h> -extern ssize_t __getdirentries64 (int, char *, size_t, off_t *); - - /* Read a directory entry from DIRP, store result in ENTRY and return pointer to result in *RESULT. */ int @@ -47,7 +44,6 @@ readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result) /* We've emptied out our buffer. Refill it. */ size_t maxread; - off_t base; ssize_t bytes; #ifndef _DIRENT_HAVE_D_RECLEN @@ -57,8 +53,7 @@ readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result) maxread = dirp->allocation; #endif - base = dirp->filepos; - bytes = __getdirentries64 (dirp->fd, dirp->data, maxread, &base); + bytes = __getdents64 (dirp->fd, dirp->data, maxread); if (bytes <= 0) { dp = NULL; |