#include <errno.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <unistd.h> #include <sys/dir.h> #include <sys/stat.h> #include "dirstream.h" /* 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; struct dirent *buf; DIR *ptr; if (stat(name, &statbuf)) return NULL; if (!S_ISDIR(statbuf.st_mode)) { __set_errno(ENOTDIR); return NULL; } if ((fd = open(name, O_RDONLY)) < 0) return NULL; /* 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) return NULL; if (!(ptr = malloc(sizeof(*ptr)))) { close(fd); __set_errno(ENOMEM); return NULL; } ptr->dd_max = statbuf.st_blksize; if (ptr->dd_max < 512) ptr->dd_max = 512; if (!(buf = malloc(ptr->dd_max))) { close(fd); free(ptr); __set_errno(ENOMEM); return NULL; } ptr->dd_fd = fd; ptr->dd_nextoff = ptr->dd_nextloc = ptr->dd_size = 0; ptr->dd_buf = buf; ptr->dd_getdents = unknown; return ptr; }