assert_perror(3) Library Functions Manual assert_perror(3)
NAME
assert_perror - test errnum and abort
LIBRARY
Standard C library (libc, -lc)
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 in-
cluded, 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 attrib-
utes(7).
┌───────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────────────────┼───────────────┼─────────┤
│ assert_perror() │ Thread safety │ MT-Safe │
└───────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
GNU.
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)
Linux man-pages 6.7 2023-10-31 assert_perror(3)
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