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    errno

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    <metanoindex/>

     
    C++
     
    Utilities-Bibliothek
     
    Fehlerbehandlung
    Exception Handling
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    Exception handling
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    exception
    uncaught_exception
    exception_ptr(C++11)
    make_exception_ptr(C++11)
    current_exception(C++11)
    rethrow_exception(C++11)
    nested_exception(C++11)
    throw_with_nested(C++11)
    rethrow_if_nested(C++11)
    Ausnahmebehandlung Ausfälle
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    Exception handling failures
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    terminate
    terminate_handler
    get_terminate(C++11)
    set_terminate
    unexpected(veraltet)
    bad_exception
    unexpected_handler(veraltet)
    get_unexpected(C++11)(veraltet)
    set_unexpected(veraltet)
    Exception Kategorien
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    Exception categories
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    logic_error
    invalid_argument
    domain_error
    length_error
    out_of_range
    runtime_error
    range_error
    overflow_error
    underflow_error
    Fehlercodes
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    Error codes
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    Fehlercodes
    errno
    Assertions
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    Assertions
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    assert
    system_error Anlage
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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)
     
    <tbody> </tbody>
    definiert in Header <cerrno>
    #define errno /*implementation-defined*/
    errno ist ein Präprozessor-Makro, die zu einer static(bis C + +11) / thread-local(seit C++11) modifizierbaren lvalue vom Typ int erweitert. Mehrere Standard-Library-Funktionen zeigen Fehler, indem er positive Ganzzahlen errno. Typischerweise wird der Wert errno einer der Fehlercodes in <cerrno> als Makro-Konstanten, die mit dem Buchstaben E beginnen, gefolgt von Großbuchstaben oder Ziffern aufgeführten Projekte gesetzt .
    Original:
    errno is a preprocessor macro that expands to a static(bis C + +11) / thread-local(seit 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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    Der Wert der errno ist 0 beim Programmstart, und obwohl Bibliotheksfunktionen dürfen positive Ganzzahlen errno schreiben, ob ein Fehler aufgetreten ist, Bibliotheks-Funktionen speichern niemals 0 in 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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    Beispiel

    [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

    Siehe auch
    Makros für Standard-POSIX-kompatiblen Fehlerbedingungen
    Original:
    macros for standard POSIX-compatible error conditions
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    (Makro konstant) [edit]
    zeigt eine Zeichenfolge entspricht der aktuellen Fehler stderr
    Original:
    displays a character string corresponding of the current error to stderr
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    (Funktion) [edit]
    gibt einen Text-Version eines bestimmten Fehlercode
    Original:
    returns a text version of a given error code
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    (Funktion) [edit]