NAME

       assert_perror - test errnum and abort

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 │
       └────────────────┴───────────────┴─────────┘

CONFORMING TO

       This is a GNU extension.

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

       This  page  is  part of release 4.15 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 https://www.kernel.org/doc/man-pages/.