assert_perror(3) — Linux manual page


assert_perror(3)        Library Functions Manual        assert_perror(3)

NAME         top

       assert_perror - test errnum and abort

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

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

       void assert_perror(int errnum);

DESCRIPTION         top

       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         top

       No value is returned.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       │ Interface                           Attribute     Value   │
       │ assert_perror()                     │ Thread safety │ MT-Safe │

STANDARDS         top


BUGS         top

       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         top

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

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