/* * 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 "dirstream.h" libc_hidden_proto(opendir) libc_hidden_proto(open) libc_hidden_proto(fcntl) libc_hidden_proto(close) libc_hidden_proto(stat) libc_hidden_proto(fstat) /* 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 if ((fd = open(name, O_RDONLY|O_NDELAY|O_DIRECTORY)) < 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) goto close_and_ret; /* According to POSIX, directory streams should be closed when * exec. From "Anna Pluzhnikov" <besp@midway.uchicago.edu>. */ if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) { int saved_errno; close_and_ret: saved_errno = errno; close(fd); __set_errno(saved_errno); return NULL; } if (!(ptr = malloc(sizeof(*ptr)))) goto nomem_close_and_ret; ptr->dd_fd = fd; ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0; ptr->dd_max = statbuf.st_blksize; if (ptr->dd_max < 512) ptr->dd_max = 512; if (!(ptr->dd_buf = calloc(1, ptr->dd_max))) { free(ptr); nomem_close_and_ret: close(fd); __set_errno(ENOMEM); return NULL; } __pthread_mutex_init(&(ptr->dd_lock), NULL); return ptr; } libc_hidden_def(opendir)