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isinf.3p (2400B)

    

  1. '\" et
  2. .TH ISINF "3P" 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. isinf
  12. \(em test for infinity
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <math.h>
  17. .P
  18. int isinf(real-floating \fIx\fP);
  19. .fi
  20. .SH DESCRIPTION
  21. The functionality described on this reference page is aligned with the
  22. ISO\ C standard. Any conflict between the requirements described here and the
  23. ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
  24. .P
  25. The
  26. \fIisinf\fR()
  27. macro shall determine whether its argument value is an infinity
  28. (positive or negative). First, an argument represented in a format
  29. wider than its semantic type is converted to its semantic type. Then
  30. determination is based on the type of the argument.
  31. .SH "RETURN VALUE"
  32. The
  33. \fIisinf\fR()
  34. macro shall return a non-zero value if and only if its argument has an
  35. infinite value.
  36. .SH ERRORS
  37. No errors are defined.
  38. .LP
  39. .IR "The following sections are informative."
  40. .SH EXAMPLES
  41. None.
  42. .SH "APPLICATION USAGE"
  43. None.
  44. .SH RATIONALE
  45. None.
  46. .SH "FUTURE DIRECTIONS"
  47. None.
  48. .SH "SEE ALSO"
  49. .IR "\fIfpclassify\fR\^(\|)",
  50. .IR "\fIisfinite\fR\^(\|)",
  51. .IR "\fIisnan\fR\^(\|)",
  52. .IR "\fIisnormal\fR\^(\|)",
  53. .IR "\fIsignbit\fR\^(\|)"
  54. .P
  55. The Base Definitions volume of POSIX.1\(hy2017,
  56. .IR "\fB<math.h>\fP"
  57. .\"
  58. .SH COPYRIGHT
  59. Portions of this text are reprinted and reproduced in electronic form
  60. from IEEE Std 1003.1-2017, Standard for Information Technology
  61. -- Portable Operating System Interface (POSIX), The Open Group Base
  62. Specifications Issue 7, 2018 Edition,
  63. Copyright (C) 2018 by the Institute of
  64. Electrical and Electronics Engineers, Inc and The Open Group.
  65. In the event of any discrepancy between this version and the original IEEE and
  66. The Open Group Standard, the original IEEE and The Open Group Standard
  67. is the referee document. The original Standard can be obtained online at
  68. http://www.opengroup.org/unix/online.html .
  69. .PP
  70. Any typographical or formatting errors that appear
  71. in this page are most likely
  72. to have been introduced during the conversion of the source files to
  73. man page format. To report such errors, see
  74. https://www.kernel.org/doc/man-pages/reporting_bugs.html .