/* * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ #include <errno.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <fcntl.h> #include <unistd.h> #include <sys/dir.h> #include <sys/stat.h> #include <not-cancel.h> #include <dirent.h> #include "dirstream.h" static DIR *fd_to_DIR(int fd, __blksize_t size) { DIR *ptr; ptr = malloc(sizeof(*ptr)); if (!ptr) return NULL; ptr->dd_fd = fd; ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0; ptr->dd_max = size; if (ptr->dd_max < 512) ptr->dd_max = 512; ptr->dd_buf = calloc(1, ptr->dd_max); if (!ptr->dd_buf) { free(ptr); return NULL; } __UCLIBC_MUTEX_INIT_VAR(ptr->dd_lock); return ptr; } DIR *fdopendir(int fd) { int flags; struct stat st; if (fstat(fd, &st)) return NULL; if (!S_ISDIR(st.st_mode)) { __set_errno(ENOTDIR); return NULL; } flags = fcntl(fd, F_GETFL); if (flags == -1) return NULL; if ((flags & O_ACCMODE) == O_WRONLY) { __set_errno(EINVAL); return NULL; } return fd_to_DIR(fd, st.st_blksize); } /* opendir just makes an open() call - it return NULL if it fails * (open sets errno), otherwise it returns a DIR * pointer. */ DIR *opendir(const char *name) { int fd; struct stat statbuf; DIR *ptr; #ifndef O_DIRECTORY /* O_DIRECTORY is linux specific and has been around since like 2.1.x */ if (stat(name, &statbuf)) return NULL; if (!S_ISDIR(statbuf.st_mode)) { __set_errno(ENOTDIR); return NULL; } # define O_DIRECTORY 0 #endif fd = open_not_cancel_2(name, O_RDONLY|O_NDELAY|O_DIRECTORY|O_CLOEXEC); if (fd < 0) return NULL; /* Note: we should check to make sure that between the stat() and open() * call, 'name' didnt change on us, but that's only if O_DIRECTORY isnt * defined and since Linux has supported it for like ever, i'm not going * to worry about it right now (if ever). */ if (fstat(fd, &statbuf) < 0) { /* this close() never fails *int saved_errno; *saved_errno = errno; */ close_not_cancel_no_status(fd); /*__set_errno(saved_errno);*/ return NULL; } /* According to POSIX, directory streams should be closed when * exec. From "Anna Pluzhnikov" <besp@midway.uchicago.edu>. */ #ifndef __ASSUME_O_CLOEXEC fcntl_not_cancel(fd, F_SETFD, FD_CLOEXEC); #endif ptr = fd_to_DIR(fd, statbuf.st_blksize); if (!ptr) { close_not_cancel_no_status(fd); /* __set_errno(ENOMEM); */ } return ptr; } libc_hidden_def(opendir)