| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> |
| 3 | * |
| 4 | * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. |
| 5 | */ |
| 6 | |
| 7 | #include <errno.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | #include <sys/types.h> |
| 11 | #include <fcntl.h> |
| 12 | #include <unistd.h> |
| 13 | #include <sys/dir.h> |
| 14 | #include <sys/stat.h> |
| 15 | #include <not-cancel.h> |
| 16 | #include <dirent.h> |
| 17 | #include "dirstream.h" |
| 18 | |
| 19 | static DIR *fd_to_DIR(int fd, __blksize_t size) |
| 20 | { |
| 21 | DIR *ptr; |
| 22 | |
| 23 | ptr = malloc(sizeof(*ptr)); |
| 24 | if (!ptr) |
| 25 | return NULL; |
| 26 | |
| 27 | ptr->dd_fd = fd; |
| 28 | ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0; |
| 29 | ptr->dd_max = size; |
| 30 | if (ptr->dd_max < 512) |
| 31 | ptr->dd_max = 512; |
| 32 | |
| 33 | ptr->dd_buf = calloc(1, ptr->dd_max); |
| 34 | if (!ptr->dd_buf) { |
| 35 | free(ptr); |
| 36 | return NULL; |
| 37 | } |
| 38 | __UCLIBC_MUTEX_INIT_VAR(ptr->dd_lock); |
| 39 | |
| 40 | return ptr; |
| 41 | } |
| 42 | |
| 43 | DIR *fdopendir(int fd) |
| 44 | { |
| 45 | int flags; |
| 46 | struct stat st; |
| 47 | |
| 48 | if (fstat(fd, &st)) |
| 49 | return NULL; |
| 50 | if (!S_ISDIR(st.st_mode)) { |
| 51 | __set_errno(ENOTDIR); |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | flags = fcntl(fd, F_GETFL); |
| 56 | if (flags == -1) |
| 57 | return NULL; |
| 58 | if ((flags & O_ACCMODE) == O_WRONLY) { |
| 59 | __set_errno(EINVAL); |
| 60 | return NULL; |
| 61 | } |
| 62 | |
| 63 | return fd_to_DIR(fd, st.st_blksize); |
| 64 | } |
| 65 | |
| 66 | /* opendir just makes an open() call - it return NULL if it fails |
| 67 | * (open sets errno), otherwise it returns a DIR * pointer. |
| 68 | */ |
| 69 | DIR *opendir(const char *name) |
| 70 | { |
| 71 | int fd; |
| 72 | struct stat statbuf; |
| 73 | DIR *ptr; |
| 74 | |
| 75 | #ifndef O_DIRECTORY |
| 76 | /* O_DIRECTORY is linux specific and has been around since like 2.1.x */ |
| 77 | if (stat(name, &statbuf)) |
| 78 | return NULL; |
| 79 | if (!S_ISDIR(statbuf.st_mode)) { |
| 80 | __set_errno(ENOTDIR); |
| 81 | return NULL; |
| 82 | } |
| 83 | # define O_DIRECTORY 0 |
| 84 | #endif |
| 85 | fd = open_not_cancel_2(name, O_RDONLY|O_NDELAY|O_DIRECTORY|O_CLOEXEC); |
| 86 | if (fd < 0) |
| 87 | return NULL; |
| 88 | /* Note: we should check to make sure that between the stat() and open() |
| 89 | * call, 'name' didnt change on us, but that's only if O_DIRECTORY isnt |
| 90 | * defined and since Linux has supported it for like ever, i'm not going |
| 91 | * to worry about it right now (if ever). */ |
| 92 | |
| 93 | if (fstat(fd, &statbuf) < 0) { |
| 94 | /* this close() never fails |
| 95 | *int saved_errno; |
| 96 | *saved_errno = errno; */ |
| 97 | close_not_cancel_no_status(fd); |
| 98 | /*__set_errno(saved_errno);*/ |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | /* According to POSIX, directory streams should be closed when |
| 103 | * exec. From "Anna Pluzhnikov" <besp@midway.uchicago.edu>. |
| 104 | */ |
| 105 | #ifndef __ASSUME_O_CLOEXEC |
| 106 | fcntl_not_cancel(fd, F_SETFD, FD_CLOEXEC); |
| 107 | #endif |
| 108 | |
| 109 | ptr = fd_to_DIR(fd, statbuf.st_blksize); |
| 110 | |
| 111 | if (!ptr) { |
| 112 | close_not_cancel_no_status(fd); |
| 113 | __set_errno(ENOMEM); |
| 114 | } |
| 115 | return ptr; |
| 116 | } |
| 117 | libc_hidden_def(opendir) |