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assert_perror(3) — Linux manual page

assert_perror(3)         Library Functions Manualassert_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(interrnum);

DESCRIPTION        top

       If the macroNDEBUGwas defined at the moment<assert.h> was last       included, the macroassert_perror() generates no code, and hence       does nothing at all.  Otherwise, the macroassert_perror() prints       an error message to standard error and terminates the program by       callingabort(3) iferrnum is nonzero.  The message contains the       filename, function name and line number of the macro call, and the       output ofstrerror(errnum).

RETURN VALUE        top

       No value is returned.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │assert_perror()                      │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS        top

       GNU.

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 whenNDEBUGis 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 theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17assert_perror(3)

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