assert_perror(poll.html) - phpMan

ASSERT_PERROR(3)           Linux Programmer's Manual          ASSERT_PERROR(3)
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 str-
       error(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/.
GNU                               2017-09-15                  ASSERT_PERROR(3)