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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 stan- dards as follows: siginterrupt() (libc version): XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies the expected interrupt signal. Indicates whether the func- tion 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 dis- abled. 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 actu- ally transferred. [Digital] 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 sys- tems. When writing or rewriting portable applications, use the sigac- tion() 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 exe- cution 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 spec- ified 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 sig- nal. RELATED INFORMATION Functions: sigaction(2), sigprocmask(2), sigsuspend(2) Standards: standards(5) delim off siginterrupt(3)