assert_perror(3) — Linux manual page


ASSERT_PERROR(3)          Linux Programmer's Manual         ASSERT_PERROR(3)

NAME         top

       assert_perror - test errnum and abort

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

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 │

CONFORMING TO         top

       This is a GNU extension.

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)

COLOPHON         top

       This page is part of release 5.08 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

GNU                              2017-09-15                 ASSERT_PERROR(3)

Pages that refer to this page: assert(3)