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errno

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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)
 
Defined 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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[Bearbeiten] 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

[Bearbeiten] 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]