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errno

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< cpp‎ | error

 
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
De tratamento de erros
Utilidades do programa
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Data e hora
Objetos de função
initializer_list(C++11)
bitset
hash(C++11)
Os operadores relacionais
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Troque, avançar e avançar
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
De tratamento de erros
Manipulação de exceção
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Exception handling
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exception
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Manipulação de falhas de exceção
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terminate
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Categorias de exceção
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Exception categories
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logic_error
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out_of_range
runtime_error
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overflow_error
underflow_error
Códigos de erro
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Error codes
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Códigos de erro
errno
Afirmações
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Assertions
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assert
instalação system_error
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system_error facility
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error_category(C++11)
generic_category(C++11)
system_category(C++11)
error_condition(C++11)
errc(C++11)
error_code(C++11)
system_error(C++11)
 
Defined in header <cerrno>
#define errno /*implementation-defined*/
errno é um pré-processador de macro que se expande a uma static(até C + 11) / thread-local(a partir do C++ 11) modificável lvalue de int tipo. Várias funções de biblioteca padrão indicam erros, por escrito inteiros positivos para errno. Tipicamente, o valor de errno é definido como um dos códigos de erro, como listado na <cerrno> constantes de macros que começam com a letra E, seguido por letras maiúsculas ou dígitos.
Original:
errno is a preprocessor macro that expands to a static(até C + 11) / thread-local(a partir do C++ 11) modifiable lvalue of type int. Several standard library functions indicate errors by writing positive integers to errno. Typically, the value of errno is set to one of the error codes, listed in <cerrno> as macro constants that begin with the letter E, followed by uppercase letters or digits.
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O valor da errno é 0 na inicialização do programa e, embora as funções da biblioteca é permitido escrever números inteiros positivos para errno ou não um erro, nunca bibliotecas de funções armazenar 0 em errno.
Original:
The value of errno is 0 at program startup, and although library functions are allowed to write positive integers to errno whether or not an error occurred, library functions never store 0 in errno.
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[editar] Exemplo

[edit]
#include <iostream>
#include <cmath>
#include <cerrno>
#include <cstring>
 
int main()
{
    double not_a_number = std::log(-1.0);
    if (errno == EDOM) {
        std::cout << "log(-1) failed: " << std::strerror(errno) << '\n';
    }
}

Output:

log(-1) failed: Numerical argument out of domain

[editar] Veja também

macros para condições normais POSIX-compatíveis erro
Original:
macros for standard POSIX-compatible error conditions
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(macro constante) [edit]
exibe uma seqüência de caracteres correspondente do erro atual para stderr
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displays a character string corresponding of the current error to stderr
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(função) [edit]
retorna uma versão do texto de um código de erro apresentado
Original:
returns a text version of a given error code
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(função) [edit]