assert_perror - test errnum and abort
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <assert.h> 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 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.
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