sigblock() block signals	Function
	SYNOPSIS DESCRIPTION PARAMETERS RETURN VALUES CONFORMANCE MULTITHREAD SAFETY LEVEL PORTING ISSUES AVAILABILITY SEE ALSO

---

SYNOPSIS

#include <signal.h>

int sigblock(int mask);

---

DESCRIPTION

The sigblock() function call causes the signals specified in mask to be added to the set of signals currently being blocked from delivery. Signal j is blocked if the j-th bit in mask is a 1.

SIGKILL and SIGSTOP cannot be blocked.

The previous set of blocked signals is returned.

---

PARAMETERS

mask 

Specifies signals to be added to those currently blocked.

---

RETURN VALUES

sigblock() returns the old signal mask value.

---

CONFORMANCE

4.4BSD.

---

MULTITHREAD SAFETY LEVEL

MT-Safe.

---

PORTING ISSUES

None.

---

AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

---

SEE ALSO

api_intro

Functions:

sigmask(), signal(), sigsetmask()

---

PTC MKS Toolkit 10.5 Documentation Build 40.