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assert.h.0p (2489B)

    

  1. '\" et
  2. .TH assert.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
  3. .\"
  4. .SH PROLOG
  5. This manual page is part of the POSIX Programmer's Manual.
  6. The Linux implementation of this interface may differ (consult
  7. the corresponding Linux manual page for details of Linux behavior),
  8. or the interface may not be implemented on Linux.
  9. .\"
  10. .SH NAME
  11. assert.h
  12. \(em verify program assertion
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <assert.h>
  17. .fi
  18. .SH DESCRIPTION
  19. The functionality described on this reference page is aligned with the
  20. ISO\ C standard. Any conflict between the requirements described here and the
  21. ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
  22. .P
  23. The
  24. .IR <assert.h> 
  25. header shall define the
  26. \fIassert\fR()
  27. macro. It refers to the macro NDEBUG
  28. which is not defined in the header. If NDEBUG is defined as a macro
  29. name before the inclusion of this header, the
  30. \fIassert\fR()
  31. macro shall be defined simply as:
  32. .sp
  33. .RS 4
  34. .nf
  36. #define assert(ignore)((void) 0)
  37. .fi
  38. .P
  39. .RE
  40. .P
  41. Otherwise, the macro behaves as described in
  42. \fIassert\fR().
  43. .P
  44. The
  45. \fIassert\fR()
  46. macro shall be redefined according to the current state of NDEBUG each
  47. time
  48. .IR <assert.h> 
  49. is included.
  50. .P
  51. The
  52. \fIassert\fR()
  53. macro shall be implemented as a macro, not as a function. If the macro
  54. definition is suppressed in order to access an actual function, the
  55. behavior is undefined.
  56. .LP
  57. .IR "The following sections are informative."
  58. .SH "APPLICATION USAGE"
  59. None.
  60. .SH RATIONALE
  61. None.
  62. .SH "FUTURE DIRECTIONS"
  63. None.
  64. .SH "SEE ALSO"
  65. The System Interfaces volume of POSIX.1\(hy2017,
  66. .IR "\fIassert\fR\^(\|)"
  67. .\"
  68. .SH COPYRIGHT
  69. Portions of this text are reprinted and reproduced in electronic form
  70. from IEEE Std 1003.1-2017, Standard for Information Technology
  71. -- Portable Operating System Interface (POSIX), The Open Group Base
  72. Specifications Issue 7, 2018 Edition,
  73. Copyright (C) 2018 by the Institute of
  74. Electrical and Electronics Engineers, Inc and The Open Group.
  75. In the event of any discrepancy between this version and the original IEEE and
  76. The Open Group Standard, the original IEEE and The Open Group Standard
  77. is the referee document. The original Standard can be obtained online at
  78. http://www.opengroup.org/unix/online.html .
  79. .PP
  80. Any typographical or formatting errors that appear
  81. in this page are most likely
  82. to have been introduced during the conversion of the source files to
  83. man page format. To report such errors, see
  84. https://www.kernel.org/doc/man-pages/reporting_bugs.html .