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sys_select.h.0p (3527B)

    

  1. '\" et
  2. .TH sys_select.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/select.h
  12. \(em select types
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <sys/select.h>
  17. .fi
  18. .SH DESCRIPTION
  19. The
  20. .IR <sys/select.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/select.h> 
  36. header shall define the
  37. .BR time_t
  38. and
  39. .BR suseconds_t
  40. types as described in
  41. .IR <sys/types.h> .
  42. .P
  43. The
  44. .IR <sys/select.h> 
  45. header shall define the
  46. .BR sigset_t
  47. type as described in
  48. .IR <signal.h> .
  49. .P
  50. The
  51. .IR <sys/select.h> 
  52. header shall define the
  53. .BR timespec
  54. structure as described in
  55. .IR <time.h> .
  56. .P
  57. The
  58. .IR <sys/select.h> 
  59. header shall define the
  60. .BR fd_set
  61. type as a structure.
  62. .P
  63. The
  64. .IR <sys/select.h> 
  65. header shall define the following symbolic constant, which shall have
  66. a value suitable for use in
  67. .BR #if
  68. preprocessing directives:
  69. .IP FD_SETSIZE 12
  70. Maximum number of file descriptors in an
  71. .BR fd_set
  72. structure.
  73. .P
  74. The following shall be declared as functions, defined as macros, or
  75. both. If functions are declared, function prototypes shall be
  76. provided.
  77. .sp
  78. .RS 4
  79. .nf
  81. void FD_CLR(int, fd_set *);
  82. int  FD_ISSET(int, fd_set *);
  83. void FD_SET(int, fd_set *);
  84. void FD_ZERO(fd_set *);
  85. .fi
  86. .P
  87. .RE
  88. .P
  89. If implemented as macros, these may evaluate their arguments more than
  90. once, so applications should ensure that the arguments they supply are
  91. never expressions with side-effects.
  92. .P
  93. The following shall be declared as functions and may also be defined as
  94. macros. Function prototypes shall be provided.
  95. .sp
  96. .RS 4
  97. .nf
  99. int  pselect(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
  100.          const struct timespec *restrict, const sigset_t *restrict);
  101. int  select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
  102.          struct timeval *restrict);
  103. .fi
  104. .P
  105. .RE
  106. .P
  107. Inclusion of the
  108. .IR <sys/select.h> 
  109. header may make visible all symbols from the headers
  110. .IR <signal.h> 
  111. and
  112. .IR <time.h> .
  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<signal.h>\fP",
  123. .IR "\fB<sys_time.h>\fP",
  124. .IR "\fB<sys_types.h>\fP",
  125. .IR "\fB<time.h>\fP"
  126. .P
  127. The System Interfaces volume of POSIX.1\(hy2017,
  128. .IR "\fIpselect\fR\^(\|)"
  129. .\"
  130. .SH COPYRIGHT
  131. Portions of this text are reprinted and reproduced in electronic form
  132. from IEEE Std 1003.1-2017, Standard for Information Technology
  133. -- Portable Operating System Interface (POSIX), The Open Group Base
  134. Specifications Issue 7, 2018 Edition,
  135. Copyright (C) 2018 by the Institute of
  136. Electrical and Electronics Engineers, Inc and The Open Group.
  137. In the event of any discrepancy between this version and the original IEEE and
  138. The Open Group Standard, the original IEEE and The Open Group Standard
  139. is the referee document. The original Standard can be obtained online at
  140. http://www.opengroup.org/unix/online.html .
  141. .PP
  142. Any typographical or formatting errors that appear
  143. in this page are most likely
  144. to have been introduced during the conversion of the source files to
  145. man page format. To report such errors, see
  146. https://www.kernel.org/doc/man-pages/reporting_bugs.html .