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siginterrupt(3)
NAME
  siginterrupt - Allow signals to interrupt functions

SYNOPSIS
  #include <signal.h>

  int siginterrupt(
	  int sig,
	  int flag );

LIBRARY
  Standard C Library (libc)

  Berkeley Compatibility Library (libbsd.a)

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  siginterrupt() (libc version):  XSH4.2

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  sig Specifies the expected interrupt signal.

  flag
      Indicates whether the function is to restart when interrupted by the
      specified signal. When the flag parameter is TRUE, restart is disabled.
      When the flag parameter is FALSE, restart is enabled.

DESCRIPTION
  The siginterrupt() function is used to change the restart behavior of a
  system call when it is interrupted by the signal specified by the sig
  parameter. When the flag parameter is FALSE (0), system calls restart when
  they are interrupted by the sig signal and no data has yet been
  transferred.

  When the flag parameter is TRUE (1), restart of system calls is disabled.
  When a system call is interrupted by the sig signal and no data has been
  transferred, the function returns a value of -1 with errno set to [EINTR].
  Otherwise, interrupted system calls that have started transferring data
  return a value that is the number of data bytes actually transferred.

  [Tru64 UNIX]	System call interrupt is the default behavior unless the
  calling program has been linked with the libbsd library and the libbsd
  version of signal() has been used.

NOTES
  The siginterrupt() function is provided for compatibility with BSD systems.
  When writing or rewriting portable applications, use the sigaction()
  function with the SA_RESTART option instead of siginterrupt().

  The use of the siginterrupt() function does not affect signal-handling
  semantics in any other way. Programs may switch between restartable and
  interruptible system call operation as often as desired in the execution of
  a program.

  Issuing a siginterrupt() call during the execution of a signal handler
  causes the new action to take place when the next instance of the specified
  signal is caught.

RETURN VALUES
  Upon successful completion, siginterrupt() returns a value of 0 (zero).
  Otherwise, a value of -1 is returned to indicate that an invalid signal
  value has been used.

ERRORS
  If the siginterrupt() function fails, errno may be set to the following
  value:

  [EINVAL]
      The value of the sig parameter does not represent a valid signal.

SEE ALSO
  Functions: sigaction(2), sigprocmask(2), sigsuspend(2)

  Standards: standards(5)

Index for Section 3

Alphabetical listing for S

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