sigreturn man page on 4.4BSD

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SIGRETURN(2)		    BSD System Calls Manual		  SIGRETURN(2)

     sigreturn — return from signal

     #include <signal.h>

     struct sigcontext {
	     int sc_onstack;
	     int sc_mask;
	     int sc_sp;
	     int sc_fp;
	     int sc_ap;
	     int sc_pc;
	     int sc_ps;

     sigreturn(struct sigcontext *scp);

     Sigreturn() allows users to atomically unmask, switch stacks, and return
     from a signal context.  The processes signal mask and stack status are
     restored from the context.	 The system call does not return; the users
     stack pointer, frame pointer, argument pointer, and processor status
     longword are restored from the context.  Execution resumes at the speci‐
     fied pc.  This system call is used by the trampoline code and longjmp(3)
     when returning from a signal to the previously executing program.

     This system call is not available in 4.2 BSD hence it should not be used
     if backward compatibility is needed.

     If successful, the system call does not return.  Otherwise, a value of -1
     is returned and errno is set to indicate the error.

     Sigreturn() will fail and the process context will remain unchanged if
     one of the following occurs.

     [EFAULT]  Scp points to memory that is not a valid part of the process
	       address space.

     [EINVAL]  The process status longword is invalid or would improperly
	       raise the privilege level of the process.

     sigvec(2), setjmp(3)

     The sigreturn function call appeared in 4.3BSD.

4.3 Berkeley Distribution	 June 4, 1993	     4.3 Berkeley Distribution

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