Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #774
Difficulty: Medium
The finite state machine has more computational power than a Turing machine.
True or False?
Linux & Unix Commands - Search Man Pages

assert(3) [centos man page]

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

NAME
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 http://www.kernel.org/doc/man-pages/. GNU
2002-08-25 ASSERT(3)

Check Out this Related Man Page

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

NAME
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 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2002-08-25 ASSERT(3)

3 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

SFTP error Assertion failed

I get this error when I try to FTP from an HP Alpha Server to a UNIX box. FATAL: BUILD13$:SSHFC_TRANSFER.C;1:1835 SshFCTransfer (function name unavailable) Assertion failed: tdata ->current_dest_file->attributes->flags & 0x00000004 the sftp /put fails just before it does the actual transfer.... (2 Replies)
Discussion started by: NoelSacay
2 Replies

2. Programming

Fork thread, Assertion failed. X11.

Hi all. I wrote a program with the Motif Widget Toolkit. It has a button and a scrollbar. When the user hits the button the callback creates a new fork() thread. The new thread sleeps for a while and then changes the position of the scrollbar. It does this in an endless loop. I need the... (2 Replies)
Discussion started by: mghis
2 Replies

3. Programming

Can't debug: assert error with gdb (no problem without)

I'm sorry if the title is really criptic, but I don't know how to phrase my problem. I know I can't really ask for a solution, and I normally wouldn't but this is really escaping my abilities. Antefacts. I developed a program using the zeromq messaging library. I got to a point where the... (11 Replies)
Discussion started by: erupter
11 Replies

Featured Tech Videos