errno
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| Definido en la cabecera <cerrno>
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| #define errno /*implementation-defined*/ |
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errno es una macro de preprocesador que se expande a un static(hasta C++11) / thread-local(desde C++11) lvalue modificable de int tipo. Varias funciones de la librería estándar indican errores al escribir los números enteros positivos a errno. Normalmente, el valor de errno se establece en uno de los códigos de error, que se enumeran en <cerrno> como constantes macro que comienzan con la letra E, seguido de las letras en mayúsculas o dígitos .Original:
errno is a preprocessor macro that expands to a static(hasta C++11) / thread-local(desde 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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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El valor de
errno es 0 al inicio del programa, y si bien las funciones de biblioteca se les permite escribir números enteros positivos a errno si se produce un error, nunca las funciones de biblioteca almacenar 0 en 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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
[editar] Ejemplo
#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'; } }
Salida:
log(-1) failed: Numerical argument out of domain
[editar] Ver también
| macros para las condiciones de error estándar POSIX compatibles Original: macros for standard POSIX-compatible error conditions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (macro de constante) | |
| muestra una cadena de caracteres correspondiente del error actual a stderr Original: displays a character string corresponding of the current error to stderr The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función) | |
| devuelve una versión de texto de un código de error Original: returns a text version of a given error code The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función) |
