Blank as variable/output when run from command line Post: 302488469

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LEARN ABOUT LINUX

assert_perror

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

NAME

       assert_perror - test errnum and abort

SYNOPSIS

       #define _GNU_SOURCE
       #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 str-
       error(errnum).

RETURN VALUE

       No value is returned.

CONFORMING TO

       This is a GNU extension.

BUGS

       The purpose of the assert macros is to help the programmer find bugs in his program, 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), feature_test_macros(7)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2002-08-25							  ASSERT_PERROR(3)

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