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assert(3)
NAME
  assert - Inserts program diagnostics

SYNOPSIS
  #include <assert.h>

  void assert(
	  int expression );

LIBRARY
  Standard C Library (libc)

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  assert():  XPG4, XPG4-UNIX

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  expression
      Specifies an expression that is evaluated as TRUE or FALSE. This
      expression is evaluated in the same manner as a C language if control
      statement.

DESCRIPTION
  The assert() macro inserts diagnostics into programs. On execution, when
  the expression parameter is false (returns FALSE), this macro writes
  information about the particular call that failed, including the text of
  the argument, the name of the source file, and the source-file line number
  (the latter two are respectively the values of preprocessing macros
  __FILE__ and __LINE__) on stderr. The error message is taken from the
  standard C library message catalog. The assert() macro then calls the
  abort() function to (normally) terminate the process.

  When you compile a program with the -DNDEBUG preprocessor option, or with
  the #define NDEBUG preprocessor control statement before the #include
  <assert.h> statement, calls to the assert() macro have no effect.

RETURN VALUES
  The assert() function returns no value.

SEE ALSO
  Routines: abort(3)

  Standards: standards(5)

Index for Section 3

Alphabetical listing for A

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