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assert(3) [netbsd man page]

ASSERT(3)						   BSD Library Functions Manual 						 ASSERT(3)

assert -- expression verification macro SYNOPSIS
#include <assert.h> assert(expression); DESCRIPTION
The assert() macro tests the given expression and if it is false, the calling process is terminated. A diagnostic message, consisting of the text of the expression, the name of the source file, the line number and the enclosing function, is written to stderr and the abort(3) func- tion is called, effectively terminating the program. If expression is true, the assert() macro does nothing. The assert() macro may be removed at compile time with the cc(1) option -DNDEBUG. DIAGNOSTICS
The following diagnostic message is written to stderr if expression is false: "assertion "%s" failed: file "%s", line %d, function "%s" ", "expression", __FILE__, __LINE__, __func__); SEE ALSO
cc(1), _DIAGASSERT(3), abort(3) STANDARDS
The assert() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). HISTORY
A assert macro appeared in Version 6 AT&T UNIX. Information on the name of the enclosing function appeared in ISO/IEC 9899:1999 (``ISO C99''). BSD
January 22, 2007 BSD

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ASSERT(3)						     Linux Programmer's Manual							 ASSERT(3)

assert - abort the program if assertion is false SYNOPSIS
#include <assert.h> void assert(scalar expression); DESCRIPTION
If the macro NDEBUG was defined at the moment <assert.h> was last included, the macro assert() generates no code, and hence does nothing at all. Otherwise, the macro assert() prints an error message to standard error and terminates the program by calling abort(3) if expression is false (i.e., compares equal to zero). The purpose of this macro is to help the programmer find bugs in his program. The message "assertion failed in file foo.c, function do_bar(), line 1287" is of no help at all to a user. RETURN VALUE
No value is returned. CONFORMING TO
POSIX.1-2001, C89, C99. In C89, expression is required to be of type int and undefined behavior results if it is not, but in C99 it may have any scalar type. BUGS
assert() is implemented as a macro; if the expression tested has side-effects, program behavior will be different depending on whether NDE- BUG is defined. This may create Heisenbugs which go away when debugging is turned on. SEE ALSO
abort(3), assert_perror(3), exit(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2002-08-25 ASSERT(3)

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