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siginterrupt.3p (2724B)

    

  1. '\" et
  2. .TH SIGINTERRUPT "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. siginterrupt
  12. \(em allow signals to interrupt functions
  13. .SH SYNOPSIS
  14. .LP
  15. .nf
  16. #include <signal.h>
  17. .P
  18. int siginterrupt(int \fIsig\fP, int \fIflag\fP);
  19. .fi
  20. .SH DESCRIPTION
  21. The
  22. \fIsiginterrupt\fR()
  23. function shall change the restart behavior when a function is
  24. interrupted by the specified signal. The function
  25. \fIsiginterrupt\fP(\fIsig\fP, \fIflag\fP) has an effect as if
  26. implemented as:
  27. .sp
  28. .RS 4
  29. .nf
  31. int siginterrupt(int sig, int flag) {
  32.     int ret;
  33.     struct sigaction act;
  34. .P
  35.     (void) sigaction(sig, NULL, &act);
  36.     if (flag)
  37.         act.sa_flags &= \(tiSA_RESTART;
  38.     else
  39.         act.sa_flags |= SA_RESTART;
  40.     ret = sigaction(sig, &act, NULL);
  41.     return ret;
  42. }
  43. .fi
  44. .P
  45. .RE
  46. .SH "RETURN VALUE"
  47. Upon successful completion,
  48. \fIsiginterrupt\fR()
  49. shall return 0; otherwise, \-1 shall be returned and
  50. .IR errno
  51. set to indicate the error.
  52. .SH ERRORS
  53. The
  54. \fIsiginterrupt\fR()
  55. function shall fail if:
  56. .TP
  57. .BR EINVAL
  58. The
  59. .IR sig
  60. argument is not a valid signal number.
  61. .LP
  62. .IR "The following sections are informative."
  63. .SH EXAMPLES
  64. None.
  65. .SH "APPLICATION USAGE"
  66. The
  67. \fIsiginterrupt\fR()
  68. function supports programs written to historical system interfaces.
  69. Applications should use the
  70. \fIsigaction\fR()
  71. with the SA_RESTART flag instead of the obsolescent
  72. \fIsiginterrupt\fR()
  73. function.
  74. .SH RATIONALE
  75. None.
  76. .SH "FUTURE DIRECTIONS"
  77. None.
  78. .SH "SEE ALSO"
  79. .IR "Section 2.4" ", " "Signal Concepts",
  80. .IR "\fIsigaction\fR\^(\|)"
  81. .P
  82. The Base Definitions volume of POSIX.1\(hy2017,
  83. .IR "\fB<signal.h>\fP"
  84. .\"
  85. .SH COPYRIGHT
  86. Portions of this text are reprinted and reproduced in electronic form
  87. from IEEE Std 1003.1-2017, Standard for Information Technology
  88. -- Portable Operating System Interface (POSIX), The Open Group Base
  89. Specifications Issue 7, 2018 Edition,
  90. Copyright (C) 2018 by the Institute of
  91. Electrical and Electronics Engineers, Inc and The Open Group.
  92. In the event of any discrepancy between this version and the original IEEE and
  93. The Open Group Standard, the original IEEE and The Open Group Standard
  94. is the referee document. The original Standard can be obtained online at
  95. http://www.opengroup.org/unix/online.html .
  96. .PP
  97. Any typographical or formatting errors that appear
  98. in this page are most likely
  99. to have been introduced during the conversion of the source files to
  100. man page format. To report such errors, see
  101. https://www.kernel.org/doc/man-pages/reporting_bugs.html .