2 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
4 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
7 #include <sys/syscall.h>
8 #include <bits/wordsize.h>
10 #if !(defined __UCLIBC_HAS_LFS__ && defined __NR_getdents64 && __WORDSIZE == 64)
14 #include <sys/types.h>
15 #include <bits/kernel_types.h>
16 #include <bits/kernel-features.h>
18 /* If the condition above is met, __getdents is defined as an alias
19 * for __getdents64 (see getdents64.c). Otherwise...
22 /* With newer versions of linux, the getdents syscall returns d_type
23 * information after the name field.
25 * See __ASSUME_GETDENTS32_D_TYPE in glibc's kernel-features.h for specific
26 * version / arch details.
29 # ifdef __ARCH_HAS_DEPRECATED_SYSCALLS__
34 unsigned short int d_reclen;
38 # define kernel_dirent dirent
41 # if defined __NR_getdents
42 # define __NR___syscall_getdents __NR_getdents
43 static __always_inline _syscall3(int, __syscall_getdents, int, fd, unsigned char *, kdirp, size_t, count)
46 # if defined __ASSUME_GETDENTS32_D_TYPE && defined __NR_getdents
48 ssize_t __getdents (int fd, char *buf, size_t nbytes)
52 retval = __syscall_getdents(fd, (unsigned char *)buf, nbytes);
54 /* The kernel added the d_type value after the name. Change
58 struct kernel_dirent k;
60 } *kbuf = (void *) buf;
62 while ((char *) kbuf < buf + retval) {
63 char d_type = *((char *) kbuf + kbuf->k.d_reclen - 1);
64 memmove (kbuf->u.d_name, kbuf->k.d_name,
65 strlen (kbuf->k.d_name) + 1);
66 kbuf->u.d_type = d_type;
68 kbuf = (void *) ((char *) kbuf + kbuf->k.d_reclen);
75 # elif ! defined __UCLIBC_HAS_LFS__ || !defined __NR_getdents64
81 # include <sys/param.h>
82 # include <bits/uClibc_alloc.h>
84 ssize_t __getdents (int fd, char *buf, size_t nbytes)
87 off_t last_offset = -1;
90 struct kernel_dirent *skdp, *kdp;
91 const size_t size_diff = (offsetof (struct dirent, d_name)
92 - offsetof (struct kernel_dirent, d_name));
94 # ifdef __ARCH_HAS_DEPRECATED_SYSCALLS__
95 red_nbytes = MIN (nbytes - ((nbytes /
96 (offsetof (struct dirent, d_name) + 14)) * size_diff),
99 dp = (struct dirent *) buf;
100 skdp = kdp = stack_heap_alloc(red_nbytes);
102 retval = __syscall_getdents(fd, (unsigned char *)kdp, red_nbytes);
105 dp = (struct dirent *) buf;
106 skdp = kdp = stack_heap_alloc(nbytes);
108 retval = INLINE_SYSCALL(getdents64, 3, fd, (unsigned char *)kdp, nbytes);
110 /* Did we overflow? */
111 if (kdp->__pad1 || kdp->__pad2) {
119 stack_heap_free(skdp);
123 while ((char *) kdp < (char *) skdp + retval) {
124 const size_t alignment = __alignof__ (struct dirent);
125 /* Since kdp->d_reclen is already aligned for the kernel structure
126 this may compute a value that is bigger than necessary. */
127 size_t new_reclen = ((kdp->d_reclen + size_diff + alignment - 1)
129 if ((char *) dp + new_reclen > buf + nbytes) {
130 /* Our heuristic failed. We read too many entries. Reset
132 assert (last_offset != -1);
133 lseek(fd, last_offset, SEEK_SET);
135 if ((char *) dp == buf) {
136 /* The buffer the user passed in is too small to hold even
138 stack_heap_free(skdp);
139 __set_errno (EINVAL);
145 last_offset = kdp->d_off;
146 dp->d_ino = kdp->d_ino;
147 dp->d_off = kdp->d_off;
148 dp->d_reclen = new_reclen;
149 dp->d_type = DT_UNKNOWN;
150 memcpy (dp->d_name, kdp->d_name,
151 kdp->d_reclen - offsetof (struct kernel_dirent, d_name));
152 dp = (struct dirent *) ((char *) dp + new_reclen);
153 kdp = (struct kernel_dirent *) (((char *) kdp) + kdp->d_reclen);
155 stack_heap_free(skdp);
156 return (char *) dp - buf;
159 # elif __WORDSIZE == 32 && !defined __NR_getdents64
163 ssize_t __getdents (int fd, char *buf, size_t nbytes)
166 struct dirent64 *dp64;
167 ssize_t ret = __getdents64 (fd, buf, nbytes);
172 dp64 = (struct dirent64 *) buf;
174 while ((void *) dp64 < (void *) buf) {
175 dp = (struct dirent *) dp64;
176 dp->d_ino = dp64->d_ino;
177 dp->d_off = dp64->d_off;
178 dp->d_reclen = dp64->d_reclen;
179 dp->d_type = dp64->d_type;
180 memmove (dp->d_name, dp64->d_name, dp->d_reclen - offsetof (struct dirent64, d_name));
181 memmove (dp64, dp, dp->d_reclen);
182 dp64 = ((void *) dp64) + dp->d_reclen;
190 # if defined __UCLIBC_HAS_LFS__ && ! defined __NR_getdents64
191 strong_alias(__getdents,__getdents64)