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UNIX for Dummies Questions & Answers
System calls in UNIX
Post 302594621 by bjhum33 on Tuesday 31st of January 2012 07:42:33 PM
01-31-2012
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LEARN ABOUT BSD
siginterrupt
SIGINTERRUPT(3) Library Functions Manual SIGINTERRUPT(3) NAME
siginterrupt - allow signals to interrupt system calls SYNOPSIS
siginterrupt(sig, flag); int sig, flag; DESCRIPTION
Siginterrupt 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. Sys- tem 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 UNIX systems. Note that the new 4.2 BSD signal handling semantics are not altered in any other way. Most notably, signal handlers always remain installed until explicitly changed by a subsequent sigvec(2) call, and the signal mask operates as documented in sigvec(2). Programs may switch between restartable and interruptible system call operation as often as desired in the execution of a program. Issuing a siginterrupt(3) call during the execution of a signal handler will cause the new action to take place on the next signal to be caught. NOTES
This library routine uses an extension of the sigvec(2) system call that is not available in 4.2BSD, hence it should not be used if back- ward compatibility is needed. RETURN VALUE
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 May 15, 1985 SIGINTERRUPT(3)