+++ /dev/null
-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-/*
- * Ceph - scalable distributed file system
- *
- * Copyright (C) 2011 New Dream Network
- *
- * This is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software
- * Foundation. See file COPYING.
- *
- */
-
-#include "common/safe_io.h"
-#include "include/compat.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-
-ssize_t safe_read(int fd, void *buf, size_t count)
-{
- size_t cnt = 0;
-
- while (cnt < count) {
- ssize_t r = read(fd, buf, count - cnt);
- if (r <= 0) {
- if (r == 0) {
- // EOF
- return cnt;
- }
- if (errno == EINTR)
- continue;
- return -errno;
- }
- cnt += r;
- buf = (char *)buf + r;
- }
- return cnt;
-}
-
-ssize_t safe_read_exact(int fd, void *buf, size_t count)
-{
- ssize_t ret = safe_read(fd, buf, count);
- if (ret < 0)
- return ret;
- if ((size_t)ret != count)
- return -EDOM;
- return 0;
-}
-
-ssize_t safe_write(int fd, const void *buf, size_t count)
-{
- while (count > 0) {
- ssize_t r = write(fd, buf, count);
- if (r < 0) {
- if (errno == EINTR)
- continue;
- return -errno;
- }
- count -= r;
- buf = (char *)buf + r;
- }
- return 0;
-}
-
-ssize_t safe_pread(int fd, void *buf, size_t count, off_t offset)
-{
- size_t cnt = 0;
- char *b = (char*)buf;
-
- while (cnt < count) {
- ssize_t r = pread(fd, b + cnt, count - cnt, offset + cnt);
- if (r <= 0) {
- if (r == 0) {
- // EOF
- return cnt;
- }
- if (errno == EINTR)
- continue;
- return -errno;
- }
-
- cnt += r;
- }
- return cnt;
-}
-
-ssize_t safe_pread_exact(int fd, void *buf, size_t count, off_t offset)
-{
- ssize_t ret = safe_pread(fd, buf, count, offset);
- if (ret < 0)
- return ret;
- if ((size_t)ret != count)
- return -EDOM;
- return 0;
-}
-
-ssize_t safe_pwrite(int fd, const void *buf, size_t count, off_t offset)
-{
- while (count > 0) {
- ssize_t r = pwrite(fd, buf, count, offset);
- if (r < 0) {
- if (errno == EINTR)
- continue;
- return -errno;
- }
- count -= r;
- buf = (char *)buf + r;
- offset += r;
- }
- return 0;
-}
-
-#ifdef CEPH_HAVE_SPLICE
-ssize_t safe_splice(int fd_in, off_t *off_in, int fd_out, off_t *off_out,
- size_t len, unsigned int flags)
-{
- size_t cnt = 0;
-
- while (cnt < len) {
- ssize_t r = splice(fd_in, off_in, fd_out, off_out, len - cnt, flags);
- if (r <= 0) {
- if (r == 0) {
- // EOF
- return cnt;
- }
- if (errno == EINTR)
- continue;
- if (errno == EAGAIN)
- break;
- return -errno;
- }
- cnt += r;
- }
- return cnt;
-}
-
-ssize_t safe_splice_exact(int fd_in, off_t *off_in, int fd_out,
- off_t *off_out, size_t len, unsigned int flags)
-{
- ssize_t ret = safe_splice(fd_in, off_in, fd_out, off_out, len, flags);
- if (ret < 0)
- return ret;
- if ((size_t)ret != len)
- return -EDOM;
- return 0;
-}
-#endif
-
-int safe_write_file(const char *base, const char *file,
- const char *val, size_t vallen)
-{
- int ret;
- char fn[PATH_MAX];
- char tmp[PATH_MAX];
- int fd;
-
- // does the file already have correct content?
- char oldval[80];
- ret = safe_read_file(base, file, oldval, sizeof(oldval));
- if (ret == (int)vallen && memcmp(oldval, val, vallen) == 0)
- return 0; // yes.
-
- snprintf(fn, sizeof(fn), "%s/%s", base, file);
- snprintf(tmp, sizeof(tmp), "%s/%s.tmp", base, file);
- fd = open(tmp, O_WRONLY|O_CREAT|O_TRUNC, 0644);
- if (fd < 0) {
- ret = errno;
- return -ret;
- }
- ret = safe_write(fd, val, vallen);
- if (ret) {
- VOID_TEMP_FAILURE_RETRY(close(fd));
- return ret;
- }
-
- ret = fsync(fd);
- if (ret < 0) ret = -errno;
- VOID_TEMP_FAILURE_RETRY(close(fd));
- if (ret < 0) {
- unlink(tmp);
- return ret;
- }
- ret = rename(tmp, fn);
- if (ret < 0) {
- ret = -errno;
- unlink(tmp);
- return ret;
- }
-
- fd = open(base, O_RDONLY);
- if (fd < 0) {
- ret = -errno;
- return ret;
- }
- ret = fsync(fd);
- if (ret < 0) ret = -errno;
- VOID_TEMP_FAILURE_RETRY(close(fd));
-
- return ret;
-}
-
-int safe_read_file(const char *base, const char *file,
- char *val, size_t vallen)
-{
- char fn[PATH_MAX];
- int fd, len;
-
- snprintf(fn, sizeof(fn), "%s/%s", base, file);
- fd = open(fn, O_RDONLY);
- if (fd < 0) {
- return -errno;
- }
- len = safe_read(fd, val, vallen);
- if (len < 0) {
- VOID_TEMP_FAILURE_RETRY(close(fd));
- return len;
- }
- // close sometimes returns errors, but only after write()
- VOID_TEMP_FAILURE_RETRY(close(fd));
-
- return len;
-}
Code Review / stor4nfv.git / blobdiff