assert_perror(3) — Linux manual page

assert_perror(3)        Library Functions Manual        assert_perror(3)

NAME

       assert_perror - test errnum and abort

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <assert.h>

       void assert_perror(int errnum);

DESCRIPTION

       If the macro NDEBUG was defined at the moment <assert.h> was last
       included, the macro assert_perror() generates no code, and hence
       does nothing at all.  Otherwise, the macro assert_perror() prints
       an error message to standard error and terminates the program by
       calling abort(3) if errnum is nonzero.  The message contains the
       filename, function name and line number of the macro call, and
       the output of strerror(errnum).

RETURN VALUE

       No value is returned.

ATTRIBUTES

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ assert_perror()                     │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

STANDARDS

       GNU.

BUGS

       The purpose of the assert macros is to help programmers find bugs
       in their programs, things that cannot happen unless there was a
       coding mistake.  However, with system or library calls the
       situation is rather different, and error returns can happen, and
       will happen, and should be tested for.  Not by an assert, where
       the test goes away when NDEBUG is defined, but by proper error
       handling code.  Never use this macro.

SEE ALSO

       abort(3), assert(3), exit(3), strerror(3)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02               assert_perror(3)

Pages that refer to this page: assert(3)

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