siginterrupt - Allows signals to interrupt functions
Standard C Library (libc.so, libc.a)
Berkeley Compatibility Library (libbsd.a)
#include <signal.h> /* libc version */
int flag) ;
Interfaces documented on this reference page conform to industry standards as follows:
siginterrupt() (libc version): XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
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.
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.
[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.
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.
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.
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.
Functions: sigaction(2), sigprocmask(2), sigsuspend(2)
Standards: standards(5) delim off