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siginterrupt(3) [ultrix man page]

siginterrupt(3) 					     Library Functions Manual						   siginterrupt(3)

Name
       siginterrupt - allow signals to interrupt system calls

Syntax
       siginterrupt(sig, flag)
       int sig, flag;

Description
       The  system call is used to change the system call restart behavior when a system call is interrupted by the specified signal.  If the flag
       is false (0), then system calls will be restarted if they are interrupted by the specified signal and no data  has  been  transferred  yet.
       System call restart is the default behavior on 4.2 BSD.

       If  the flag is true (1), then restarting of system calls is disabled.  If a system call is interrupted by the specified signal and no data
       has been transferred, the system call will return -1 with errno set to EINTR.  Interrupted system calls that have started transferring data
       will  return the amount of data actually transferred.  System call interrupt is the signal behavior found on 4.1 BSD and AT&T System V sys-
       tems.

       Note that the new signal handling semantics are not altered in any other way.  Most notably, signal handlers always remain installed  until
       explicitly  changed  by a subsequent call, and the signal mask operates as documented in Programs may switch between restartable and inter-
       ruptible system call operation as often as desired in the execution of a program.

       Issuing a call during the execution of a signal handler will cause the new action to take place on the next signal to be caught.

Environment
       This library routine uses an extension of the system call that is not available in ULTRIX 2.0 or earlier versions.  Hence it should not	be
       used if backward compatibility is needed.

Return Values
       A 0 value indicates that the call succeeded.  A -1 value indicates that an invalid signal number has been supplied.

See Also
       sigvec(2), sigblock(2), sigpause(2), sigsetmask(2)

4.3 Berkeley Distribution													   siginterrupt(3)

Check Out this Related Man Page

siginterrupt(3) 					     Library Functions Manual						   siginterrupt(3)

NAME
siginterrupt - Allows signals to interrupt functions LIBRARY
Standard C Library (libc.so, libc.a) Berkeley Compatibility Library (libbsd.a) SYNOPSIS
#include <signal.h> /* libc version */ int siginterrupt( int sig, int flag) ; 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
Specifies the expected interrupt signal. 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 flag 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: The value of the sig parameter does not represent a valid signal. RELATED INFORMATION
Functions: sigaction(2), sigprocmask(2), sigsuspend(2) Standards: standards(5) delim off siginterrupt(3)

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