From 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 20:24:20 +0200 Subject: Adding upstream version 14.2.21. Signed-off-by: Daniel Baumann --- src/common/safe_io.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 src/common/safe_io.h (limited to 'src/common/safe_io.h') diff --git a/src/common/safe_io.h b/src/common/safe_io.h new file mode 100644 index 00000000..7ccbf37b --- /dev/null +++ b/src/common/safe_io.h @@ -0,0 +1,74 @@ +// -*- 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. + * + */ + +#ifndef CEPH_SAFE_IO +#define CEPH_SAFE_IO + +#include "common/compiler_extensions.h" +#include + +#ifdef __cplusplus +extern "C" { +#endif + + /* + * Safe functions wrapping the raw read() and write() libc functions. + * These retry on EINTR, and on error return -errno instead of returning + * -1 and setting errno). + */ + ssize_t safe_read(int fd, void *buf, size_t count) + WARN_UNUSED_RESULT; + ssize_t safe_write(int fd, const void *buf, size_t count) + WARN_UNUSED_RESULT; + ssize_t safe_pread(int fd, void *buf, size_t count, off_t offset) + WARN_UNUSED_RESULT; + ssize_t safe_pwrite(int fd, const void *buf, size_t count, off_t offset) + WARN_UNUSED_RESULT; +#ifdef CEPH_HAVE_SPLICE + /* + * Similar to the above (non-exact version) and below (exact version). + * See splice(2) for parameter descriptions. + */ + ssize_t safe_splice(int fd_in, off_t *off_in, int fd_out, off_t *off_out, + size_t len, unsigned int flags) + WARN_UNUSED_RESULT; + 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) + WARN_UNUSED_RESULT; +#endif + + /* + * Same as the above functions, but return -EDOM unless exactly the requested + * number of bytes can be read. + */ + ssize_t safe_read_exact(int fd, void *buf, size_t count) + WARN_UNUSED_RESULT; + ssize_t safe_pread_exact(int fd, void *buf, size_t count, off_t offset) + WARN_UNUSED_RESULT; + + + /* + * Safe functions to read and write an entire file. + */ + int safe_write_file(const char *base, const char *file, + const char *val, size_t vallen, + unsigned mode); + int safe_read_file(const char *base, const char *file, + char *val, size_t vallen); + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3