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Annotation of 43BSDTahoe/man/man2/sigreturn.2, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1985 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)sigreturn.2 6.2 (Berkeley) 6/30/85
                      6: .\"
                      7: .TH SIGRETURN 2 "June 30, 1985"
                      8: .UC 6
                      9: .SH NAME
                     10: sigreturn \- return from signal
                     11: .SH SYNOPSIS
                     12: .nf
                     13: .B #include <signal.h>
                     14: .PP
                     15: .B struct      sigcontext {
                     16: .B     int     sc_onstack;
                     17: .B     int     sc_mask;
                     18: .B     int     sc_sp;
                     19: .B     int     sc_fp;
                     20: .B     int     sc_ap;
                     21: .B     int     sc_pc;
                     22: .B     int     sc_ps;
                     23: .B };
                     24: .PP
                     25: .B sigreturn(scp);
                     26: .B struct sigcontext *scp;
                     27: .SH DESCRIPTION
                     28: .I Sigreturn
                     29: allows users to atomically unmask, switch stacks,
                     30: and return from a signal context.
                     31: The processes signal mask and stack status are
                     32: restored from the context.
                     33: The system call does not return;
                     34: the users stack pointer, frame pointer, argument pointer,
                     35: and processor status longword are restored from the context.
                     36: Execution resumes at the specified pc.
                     37: This system call is used by the trampoline code, and
                     38: .IR longjmp (3)
                     39: when returning from a signal to the previously executing program.
                     40: .SH NOTES
                     41: This system call is not available in 4.2BSD,
                     42: hence it should not be used if backward compatibility is needed.
                     43: .SH "RETURN VALUE
                     44: If successful, the system call does not return.
                     45: Otherwise, a value of \-1 is returned and 
                     46: .I errno
                     47: is set to indicate the error.
                     48: .SH ERRORS
                     49: .I Sigreturn
                     50: will fail and the process context will remain unchanged
                     51: if one of the following occurs.
                     52: .TP 15
                     53: [EFAULT]
                     54: .I Scp
                     55: points to memory that is not a valid part of the process
                     56: address space.
                     57: .TP
                     58: [EINVAL]
                     59: The process status longword is invalid or would improperly
                     60: raise the privilege level of the process.
                     61: .SH "SEE ALSO"
                     62: sigvec(2), setjmp(3)

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