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sys_time.h.0p (3553B)

    

  1. '\" et
  2. .TH sys_time.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. sys/time.h
  12. \(em time types
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <sys/time.h>
  17. .fi
  18. .SH DESCRIPTION
  19. The
  20. .IR <sys/time.h> 
  21. header shall define the
  22. .BR timeval
  23. structure, which shall include at least the following members:
  24. .sp
  25. .RS 4
  26. .nf
  28. time_t         tv_sec      \fRSeconds.\fR
  29. suseconds_t    tv_usec     \fRMicroseconds.\fR
  30. .fi
  31. .P
  32. .RE
  33. .P
  34. The
  35. .IR <sys/time.h> 
  36. header shall define the
  37. .BR itimerval
  38. structure, which shall include at least the following members:
  39. .sp
  40. .RS 4
  41. .nf
  43. struct timeval it_interval \fRTimer interval.\fR
  44. struct timeval it_value    \fRCurrent value.\fR
  45. .fi
  46. .P
  47. .RE
  48. .P
  49. The
  50. .IR <sys/time.h> 
  51. header shall define the
  52. .BR time_t
  53. and
  54. .BR suseconds_t
  55. types as described in
  56. .IR <sys/types.h> .
  57. .P
  58. The
  59. .IR <sys/time.h> 
  60. header shall define the
  61. .BR fd_set
  62. type as described in
  63. .IR <sys/select.h> .
  64. .P
  65. The
  66. .IR <sys/time.h> 
  67. header shall define the following symbolic constants for the
  68. .IR which
  69. argument of
  70. \fIgetitimer\fR()
  71. and
  72. \fIsetitimer\fR():
  73. .IP ITIMER_REAL 14
  74. Decrements in real time.
  75. .IP ITIMER_VIRTUAL 14
  76. Decrements in process virtual time.
  77. .IP ITIMER_PROF 14
  78. Decrements both in process virtual time and when the system is running
  79. on behalf of the process.
  80. .P
  81. The
  82. .IR <sys/time.h> 
  83. header shall define the following as described in
  84. .IR <sys/select.h> :
  85. \fIFD_CLR\fR()
  86. \fIFD_ISSET\fR()
  87. \fIFD_SET\fR()
  88. \fIFD_ZERO\fR()
  89. FD_SETSIZE
  90. .P
  91. The following shall be declared as functions and may also be defined
  92. as macros. Function prototypes shall be provided.
  93. .sp
  94. .RS 4
  95. .nf
  97. int   getitimer(int, struct itimerval *);
  98. int   gettimeofday(struct timeval *restrict, void *restrict);
  99. int   setitimer(int, const struct itimerval *restrict,
  100.           struct itimerval *restrict);
  101. int   select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
  102.           struct timeval *restrict);
  103. int   utimes(const char *, const struct timeval [2]);
  104. .fi
  105. .P
  106. .RE
  107. .P
  108. Inclusion of the
  109. .IR <sys/time.h> 
  110. header may make visible all symbols from the
  111. .IR <sys/select.h> 
  112. header.
  113. .LP
  114. .IR "The following sections are informative."
  115. .SH "APPLICATION USAGE"
  116. None.
  117. .SH RATIONALE
  118. None.
  119. .SH "FUTURE DIRECTIONS"
  120. None.
  121. .SH "SEE ALSO"
  122. .IR "\fB<sys_select.h>\fP",
  123. .IR "\fB<sys_types.h>\fP"
  124. .P
  125. The System Interfaces volume of POSIX.1\(hy2017,
  126. .IR "\fIfutimens\fR\^(\|)",
  127. .IR "\fIgetitimer\fR\^(\|)",
  128. .IR "\fIgettimeofday\fR\^(\|)",
  129. .IR "\fIpselect\fR\^(\|)"
  130. .\"
  131. .SH COPYRIGHT
  132. Portions of this text are reprinted and reproduced in electronic form
  133. from IEEE Std 1003.1-2017, Standard for Information Technology
  134. -- Portable Operating System Interface (POSIX), The Open Group Base
  135. Specifications Issue 7, 2018 Edition,
  136. Copyright (C) 2018 by the Institute of
  137. Electrical and Electronics Engineers, Inc and The Open Group.
  138. In the event of any discrepancy between this version and the original IEEE and
  139. The Open Group Standard, the original IEEE and The Open Group Standard
  140. is the referee document. The original Standard can be obtained online at
  141. http://www.opengroup.org/unix/online.html .
  142. .PP
  143. Any typographical or formatting errors that appear
  144. in this page are most likely
  145. to have been introduced during the conversion of the source files to
  146. man page format. To report such errors, see
  147. https://www.kernel.org/doc/man-pages/reporting_bugs.html .