std::errc

 

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std::errc

非成员函数

make_error_code

make_error_condition

辅助类

is_error_condition_enum

 

定义于头文件 <system_error>
enum class errc;		(自 C++11 起)

作用域枚举 std::errc 定义了与 POSIX 错误代码对应的可移植错误条件的值。

成员常量

名称	等效 POSIX 错误
address_family_not_supported	EAFNOSUPPORT
address_in_use	EADDRINUSE
address_not_available	EADDRNOTAVAIL
already_connected	EISCONN
argument_list_too_long	E2BIG
argument_out_of_domain	EDOM
bad_address	EFAULT
bad_file_descriptor	EBADF
bad_message	EBADMSG
broken_pipe	EPIPE
connection_aborted	ECONNABORTED
connection_already_in_progress	EALREADY
connection_refused	ECONNREFUSED
connection_reset	ECONNRESET
cross_device_link	EXDEV
destination_address_required	EDESTADDRREQ
device_or_resource_busy	EBUSY
directory_not_empty	ENOTEMPTY
executable_format_error	ENOEXEC
file_exists	EEXIST
file_too_large	EFBIG
filename_too_long	ENAMETOOLONG
function_not_supported	ENOSYS
host_unreachable	EHOSTUNREACH
identifier_removed	EIDRM
illegal_byte_sequence	EILSEQ
inappropriate_io_control_operation	ENOTTY
interrupted	EINTR
invalid_argument	invalid_argument
EINVAL	invalid_seek
ESPIPE	io_error
EIO	is_a_directory
EISDIR	message_size
EMSGSIZE	network_down
ENETDOWN	network_reset
ENETRESET	network_unreachable
ENETUNREACH	no_buffer_space
ENOBUFS	no_child_process
ECHILD	no_link
ENOLINK	no_lock_available
ENOLCK	no_message_available (已弃用)
ENODATA	no_message
ENOMSG	no_protocol_option
ENOPROTOOPT	no_space_on_device
ENOSPC	no_stream_resources (已弃用)
ENOSR	no_such_device_or_address
ENXIO	no_such_device
ENODEV	no_such_file_or_directory
ENOENT	no_such_process
ESRCH	not_a_directory
ENOTDIR	not_a_socket
ENOTSOCK	not_a_stream (已弃用)
ENOSTR	not_connected
ENOTCONN	not_enough_memory
ENOMEM	not_supported
ENOTSUP	operation_canceled
ECANCELED	operation_in_progress
EINPROGRESS	operation_not_permitted
EPERM	operation_not_supported
EOPNOTSUPP	operation_would_block
EWOULDBLOCK	owner_dead
EOWNERDEAD	permission_denied
EACCES	protocol_error
EPROTO	protocol_not_supported
EPROTONOSUPPORT	read_only_file_system
EROFS	resource_deadlock_would_occur
EDEADLK	resource_unavailable_try_again
EAGAIN	result_out_of_range
ERANGE	state_not_recoverable
ENOTRECOVERABLE	stream_timeout (已弃用)
ETIME	text_file_busy
ETXTBSY	timed_out
ETIMEDOUT	too_many_files_open_in_system
ENFILE	too_many_files_open
EMFILE	too_many_links
EMLINK	too_many_symbolic_link_levels
ELOOP	value_too_large
EOVERFLOW	wrong_protocol_type

EPROTOTYPE

make_error_code(std::errc) (C++11)	为 errc 枚举 e 创建错误代码值 (函数)
make_error_condition(std::errc) (C++11)	为 errc 值 e 创建错误条件 (函数)

辅助类

is_error_condition_enum<std::errc> (C++11)

扩展类型特征 std::is_error_condition_enum 以将 errc 值标识为错误条件 (函数模板)

示例

运行此代码

#include <filesystem>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>
#include <system_error>
#include <thread>
 
void print_error(const std::string& details, std::error_code error_code)
{
    std::string value_name;
    if (error_code == std::errc::invalid_argument)
        value_name = "std::errc::invalid_argument";
    if (error_code == std::errc::no_such_file_or_directory)
        value_name = "std::errc::no_such_file_or_directory";
    if (error_code == std::errc::is_a_directory)
        value_name = "std::errc::is_a_directory";
    if (error_code == std::errc::permission_denied)
        value_name = "std::errc::permission_denied";
 
    std::cout << details << ":\n  "
              << std::quoted(error_code.message())
              << " (" << value_name << ")\n\n";
}
 
void print_errno(const std::string& details, int errno_value = errno)
{
    print_error(details, std::make_error_code(std::errc(errno_value)));
}
 
int main()
{
    std::cout << "Detaching a not-a-thread...\n";
    try
    {
        std::thread().detach();
    }
    catch (const std::system_error& e)
    {
        print_error("Error detaching empty thread", e.code());
    }
 
    std::cout << "Opening nonexistent file...\n";
    std::ifstream nofile{"nonexistent-file"};
    if (!nofile.is_open())
        print_errno("Error opening nonexistent file for reading");
 
    std::cout << "Reading from directory as a file...\n";
    std::filesystem::create_directory("dir");
    std::ifstream dir_stream{"dir"};
    [[maybe_unused]] char c = dir_stream.get();
    if (!dir_stream.good())
        print_errno("Error reading data from directory");
 
    std::cout << "Open read-only file for writing...\n";
    std::fstream{"readonly-file", std::ios::out};
    std::filesystem::permissions("readonly-file", std::filesystem::perms::owner_read);
    std::fstream write_readonly("readonly-file", std::ios::out);
    if (!write_readonly.is_open())
        print_errno("Error opening read-only file for writing");
}

可能的输出

Detaching a not-a-thread...
Error detaching empty thread:
  "Invalid argument" (std::errc::invalid_argument)
 
Opening nonexistent file...
Error opening nonexistent file for reading:
  "No such file or directory" (std::errc::no_such_file_or_directory)
 
Reading from directory as a file...
Error reading data from directory:
  "Is a directory" (std::errc::is_a_directory)
 
Open read-only file for writing...
Error opening read-only file for writing:
  "Permission denied" (std::errc::permission_denied)

缺陷报告

以下行为变更缺陷报告被追溯应用于先前发布的 C++ 标准。

DR	应用于	已发布行为	正确行为
LWG 3869	C++11	成员常量 no_message_available、 no_stream_resources、not_a_stream 和 stream_timeout 引用了过时的 POSIX STREAMS API	已弃用它们

参见

error_code (C++11)	持有平台相关的错误代码 (类)
error_condition (C++11)	持有可移植的错误代码 (类)