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std::perror

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C++
 
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perror
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Definido no cabeçalho <cstdio>
void perror( const char *s );
Impressões para stderr o conteúdo da cadeia de caracteres terminada em nulo apontado por s (a menos que s é um ponteiro nulo), seguido pelos dois personagens ": ", seguido pela implementação mensagem de erro definida descrevendo o código de erro atualmente armazenado na variável de sistema errno (idêntica à saída do std::strerror(errno)), seguido por '\n'.
Original:
Prints to stderr the contents of the null-terminated character string pointed to by s (unless s is a null pointer), followed by the two characters ": ", followed by the implementation-defined error message describing the error code currently stored in the system variable errno (identical to the output of std::strerror(errno)), followed by '\n'.
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Índice

[editar] Parâmetros

s -
ponteiro para uma string terminada em nulo com mensagem explicativa
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pointer to a null-terminated string with explanatory message
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[editar] Valor de retorno

(Nenhum)
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(none)
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[editar] Exemplo

#include <cmath>
#include <cerrno>
#include <cstdio>
 
int main()
{
    double not_a_number = std::log(-1.0);
    if (errno == EDOM) {
        std::perror("log(-1) failed");
    }
}

Saída: 

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

[editar] Veja também
macro que se expande para POSIX compatível variable
(variável macro) número de segmento local de erro
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macro which expands to POSIX-compatible thread-local error number variable
(variável macro)
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[edit]
retorna uma versão do texto de um código de erro apresentado
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returns a text version of a given error code
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(função) [edit]
Documentação C para perror
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