assert_perror - test errnum and abort
void assert_perror(int errnum);
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
No value is returned.
This is a GNU extension.
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.
abort(3), assert(3), exit(3), strerror(3), feature_test_macros(7)
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