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authorTavian Barnes <tavianator@tavianator.com>2019-06-28 20:34:33 -0400
committerTavian Barnes <tavianator@tavianator.com>2019-06-28 20:34:49 -0400
commite8b42e513fa97af5c9978eb95ea97712f0ea5bbb (patch)
treede9d429c0ca37e1cbff85f57a324564e1bfda76e /stat.c
parent0473beaa2e3a46dd782af1182413fcdd4d33e275 (diff)
downloadbfs-single-file.tar.xz
Merge everything into one filesingle-file
Diffstat (limited to 'stat.c')
-rw-r--r--stat.c353
1 files changed, 0 insertions, 353 deletions
diff --git a/stat.c b/stat.c
deleted file mode 100644
index e3d5400..0000000
--- a/stat.c
+++ /dev/null
@@ -1,353 +0,0 @@
-/****************************************************************************
- * bfs *
- * Copyright (C) 2018-2019 Tavian Barnes <tavianator@tavianator.com> *
- * *
- * Permission to use, copy, modify, and/or distribute this software for any *
- * purpose with or without fee is hereby granted. *
- * *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
- ****************************************************************************/
-
-#include "stat.h"
-#include "util.h"
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdbool.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#ifdef STATX_BASIC_STATS
-# define HAVE_STATX true
-#elif __linux__
-# include <linux/stat.h>
-# include <sys/syscall.h>
-#endif
-
-#if HAVE_STATX || defined(__NR_statx)
-# define HAVE_BFS_STATX true
-#endif
-
-#if __APPLE__
-# define st_atim st_atimespec
-# define st_ctim st_ctimespec
-# define st_mtim st_mtimespec
-# define st_birthtim st_birthtimespec
-#endif
-
-const char *bfs_stat_field_name(enum bfs_stat_field field) {
- switch (field) {
- case BFS_STAT_DEV:
- return "device number";
- case BFS_STAT_INO:
- return "inode nunmber";
- case BFS_STAT_TYPE:
- return "type";
- case BFS_STAT_MODE:
- return "mode";
- case BFS_STAT_NLINK:
- return "link count";
- case BFS_STAT_GID:
- return "group ID";
- case BFS_STAT_UID:
- return "user ID";
- case BFS_STAT_SIZE:
- return "size";
- case BFS_STAT_BLOCKS:
- return "block count";
- case BFS_STAT_RDEV:
- return "underlying device";
- case BFS_STAT_ATIME:
- return "access time";
- case BFS_STAT_BTIME:
- return "birth time";
- case BFS_STAT_CTIME:
- return "change time";
- case BFS_STAT_MTIME:
- return "modification time";
- }
-
- assert(false);
- return "???";
-}
-
-/**
- * Check if we should retry a failed stat() due to a potentially broken link.
- */
-static bool bfs_stat_retry(int ret, enum bfs_stat_flag flags) {
- return ret != 0
- && (flags & (BFS_STAT_NOFOLLOW | BFS_STAT_TRYFOLLOW)) == BFS_STAT_TRYFOLLOW
- && is_nonexistence_error(errno);
-}
-
-/**
- * Convert a struct stat to a struct bfs_stat.
- */
-static void bfs_stat_convert(const struct stat *statbuf, struct bfs_stat *buf) {
- buf->mask = 0;
-
- buf->dev = statbuf->st_dev;
- buf->mask |= BFS_STAT_DEV;
-
- buf->ino = statbuf->st_ino;
- buf->mask |= BFS_STAT_INO;
-
- buf->mode = statbuf->st_mode;
- buf->mask |= BFS_STAT_TYPE | BFS_STAT_MODE;
-
- buf->nlink = statbuf->st_nlink;
- buf->mask |= BFS_STAT_NLINK;
-
- buf->gid = statbuf->st_gid;
- buf->mask |= BFS_STAT_GID;
-
- buf->uid = statbuf->st_uid;
- buf->mask |= BFS_STAT_UID;
-
- buf->size = statbuf->st_size;
- buf->mask |= BFS_STAT_SIZE;
-
- buf->blocks = statbuf->st_blocks;
- buf->mask |= BFS_STAT_BLOCKS;
-
- buf->rdev = statbuf->st_rdev;
- buf->mask |= BFS_STAT_RDEV;
-
- buf->atime = statbuf->st_atim;
- buf->mask |= BFS_STAT_ATIME;
-
- buf->ctime = statbuf->st_ctim;
- buf->mask |= BFS_STAT_CTIME;
-
- buf->mtime = statbuf->st_mtim;
- buf->mask |= BFS_STAT_MTIME;
-
-#if __APPLE__ || __FreeBSD__ || __NetBSD__
- buf->btime = statbuf->st_birthtim;
- buf->mask |= BFS_STAT_BTIME;
-#endif
-}
-
-/**
- * bfs_stat() implementation backed by stat().
- */
-static int bfs_stat_impl(int at_fd, const char *at_path, int at_flags, enum bfs_stat_flag flags, struct bfs_stat *buf) {
- struct stat statbuf;
- int ret = fstatat(at_fd, at_path, &statbuf, at_flags);
-
- if (bfs_stat_retry(ret, flags)) {
- at_flags |= AT_SYMLINK_NOFOLLOW;
- ret = fstatat(at_fd, at_path, &statbuf, at_flags);
- }
-
- if (ret == 0) {
- bfs_stat_convert(&statbuf, buf);
- }
-
- return ret;
-}
-
-#if HAVE_BFS_STATX
-
-/**
- * Wrapper for the statx() system call, which had no glibc wrapper prior to 2.28.
- */
-static int bfs_statx(int at_fd, const char *at_path, int at_flags, unsigned int mask, struct statx *buf) {
- // -fsanitize=memory doesn't know about statx(), so tell it the memory
- // got initialized
-#if BFS_HAS_FEATURE(memory_sanitizer, false)
- memset(buf, 0, sizeof(*buf));
-#endif
-
-#if HAVE_STATX
- return statx(at_fd, at_path, at_flags, mask, buf);
-#else
- return syscall(__NR_statx, at_fd, at_path, at_flags, mask, buf);
-#endif
-}
-
-/**
- * bfs_stat() implementation backed by statx().
- */
-static int bfs_statx_impl(int at_fd, const char *at_path, int at_flags, enum bfs_stat_flag flags, struct bfs_stat *buf) {
- unsigned int mask = STATX_BASIC_STATS | STATX_BTIME;
- struct statx xbuf;
- int ret = bfs_statx(at_fd, at_path, at_flags, mask, &xbuf);
-
- if (bfs_stat_retry(ret, flags)) {
- at_flags |= AT_SYMLINK_NOFOLLOW;
- ret = bfs_statx(at_fd, at_path, at_flags, mask, &xbuf);
- }
-
- if (ret != 0) {
- return ret;
- }
-
- // Callers shouldn't have to check anything except the times
- const unsigned int guaranteed = STATX_BASIC_STATS ^ (STATX_ATIME | STATX_CTIME | STATX_MTIME);
- if ((xbuf.stx_mask & guaranteed) != guaranteed) {
- errno = ENOTSUP;
- return -1;
- }
-
- buf->mask = 0;
-
- buf->dev = bfs_makedev(xbuf.stx_dev_major, xbuf.stx_dev_minor);
- buf->mask |= BFS_STAT_DEV;
-
- if (xbuf.stx_mask & STATX_INO) {
- buf->ino = xbuf.stx_ino;
- buf->mask |= BFS_STAT_INO;
- }
-
- buf->mode = xbuf.stx_mode;
- if (xbuf.stx_mask & STATX_TYPE) {
- buf->mask |= BFS_STAT_TYPE;
- }
- if (xbuf.stx_mask & STATX_MODE) {
- buf->mask |= BFS_STAT_MODE;
- }
-
- if (xbuf.stx_mask & STATX_NLINK) {
- buf->nlink = xbuf.stx_nlink;
- buf->mask |= BFS_STAT_NLINK;
- }
-
- if (xbuf.stx_mask & STATX_GID) {
- buf->gid = xbuf.stx_gid;
- buf->mask |= BFS_STAT_GID;
- }
-
- if (xbuf.stx_mask & STATX_UID) {
- buf->uid = xbuf.stx_uid;
- buf->mask |= BFS_STAT_UID;
- }
-
- if (xbuf.stx_mask & STATX_SIZE) {
- buf->size = xbuf.stx_size;
- buf->mask |= BFS_STAT_SIZE;
- }
-
- if (xbuf.stx_mask & STATX_BLOCKS) {
- buf->blocks = xbuf.stx_blocks;
- buf->mask |= BFS_STAT_BLOCKS;
- }
-
- buf->rdev = bfs_makedev(xbuf.stx_rdev_major, xbuf.stx_rdev_minor);
- buf->mask |= BFS_STAT_RDEV;
-
- if (xbuf.stx_mask & STATX_ATIME) {
- buf->atime.tv_sec = xbuf.stx_atime.tv_sec;
- buf->atime.tv_nsec = xbuf.stx_atime.tv_nsec;
- buf->mask |= BFS_STAT_ATIME;
- }
-
- if (xbuf.stx_mask & STATX_BTIME) {
- buf->btime.tv_sec = xbuf.stx_btime.tv_sec;
- buf->btime.tv_nsec = xbuf.stx_btime.tv_nsec;
- buf->mask |= BFS_STAT_BTIME;
- }
-
- if (xbuf.stx_mask & STATX_CTIME) {
- buf->ctime.tv_sec = xbuf.stx_ctime.tv_sec;
- buf->ctime.tv_nsec = xbuf.stx_ctime.tv_nsec;
- buf->mask |= BFS_STAT_CTIME;
- }
-
- if (xbuf.stx_mask & STATX_MTIME) {
- buf->mtime.tv_sec = xbuf.stx_mtime.tv_sec;
- buf->mtime.tv_nsec = xbuf.stx_mtime.tv_nsec;
- buf->mask |= BFS_STAT_MTIME;
- }
-
- return ret;
-}
-
-#endif // HAVE_BFS_STATX
-
-/**
- * Allows calling stat with custom at_flags.
- */
-static int bfs_stat_explicit(int at_fd, const char *at_path, int at_flags, enum bfs_stat_flag flags, struct bfs_stat *buf) {
-#if HAVE_BFS_STATX
- static bool has_statx = true;
-
- if (has_statx) {
- int ret = bfs_statx_impl(at_fd, at_path, at_flags, flags, buf);
- if (ret != 0 && errno == ENOSYS) {
- has_statx = false;
- } else {
- return ret;
- }
- }
-#endif
-
- return bfs_stat_impl(at_fd, at_path, at_flags, flags, buf);
-}
-
-int bfs_stat(int at_fd, const char *at_path, enum bfs_stat_flag flags, struct bfs_stat *buf) {
- int at_flags = 0;
- if (flags & BFS_STAT_NOFOLLOW) {
- at_flags |= AT_SYMLINK_NOFOLLOW;
- }
-
- if (at_path) {
- return bfs_stat_explicit(at_fd, at_path, at_flags, flags, buf);
- }
-
-#ifdef AT_EMPTY_PATH
- static bool has_at_ep = true;
- if (has_at_ep) {
- at_flags |= AT_EMPTY_PATH;
- int ret = bfs_stat_explicit(at_fd, "", at_flags, flags, buf);
- if (ret != 0 && errno == EINVAL) {
- has_at_ep = false;
- } else {
- return ret;
- }
- }
-#endif
-
- struct stat statbuf;
- if (fstat(at_fd, &statbuf) == 0) {
- bfs_stat_convert(&statbuf, buf);
- return 0;
- } else {
- return -1;
- }
-}
-
-const struct timespec *bfs_stat_time(const struct bfs_stat *buf, enum bfs_stat_field field) {
- if (!(buf->mask & field)) {
- errno = ENOTSUP;
- return NULL;
- }
-
- switch (field) {
- case BFS_STAT_ATIME:
- return &buf->atime;
- case BFS_STAT_BTIME:
- return &buf->btime;
- case BFS_STAT_CTIME:
- return &buf->ctime;
- case BFS_STAT_MTIME:
- return &buf->mtime;
- default:
- assert(false);
- errno = EINVAL;
- return NULL;
- }
-}
-
-void bfs_stat_id(const struct bfs_stat *buf, bfs_file_id *id) {
- memcpy(*id, &buf->dev, sizeof(buf->dev));
- memcpy(*id + sizeof(buf->dev), &buf->ino, sizeof(buf->ino));
-}