sigreturn.2 revision 252604
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@(#)sigreturn.2 8.1 (Berkeley) 6/4/93
$FreeBSD: stable/9/lib/libc/sys/sigreturn.2 252604 2013-07-03 21:05:35Z jilles $
.Dd June 4, 1993 .Dt SIGRETURN 2 .Os .Sh NAME .Nm sigreturn .Nd return from signal .Sh LIBRARY .Lb libc .Sh SYNOPSIS n signal.h .Ft int .Fn sigreturn "const ucontext_t *scp" .Sh DESCRIPTION The .Fn sigreturn system call 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 structure pointed to by .Fa scp . 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 specified pc. This system call is used by the trampoline code and .Xr longjmp 3 when returning from a signal to the previously executing program. .Sh RETURN VALUES If successful, the system call does not return. Otherwise, a value of -1 is returned and .Va errno is set to indicate the error. .Sh ERRORS The .Fn sigreturn system call will fail and the process context will remain unchanged if one of the following occurs. l -tag -width Er t Bq Er EFAULT The .Fa scp argument points to memory that is not a valid part of the process address space. t Bq Er EINVAL The process status longword is invalid or would improperly raise the privilege level of the process. .El .Sh SEE ALSO .Xr sigaction 2 , .Xr setjmp 3 , .Xr ucontext 3 .Sh HISTORY The .Fn sigreturn system call appeared in x 4.3 .
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)sigreturn.2 8.1 (Berkeley) 6/4/93
$FreeBSD: stable/9/lib/libc/sys/sigreturn.2 252604 2013-07-03 21:05:35Z jilles $
.Dd June 4, 1993 .Dt SIGRETURN 2 .Os .Sh NAME .Nm sigreturn .Nd return from signal .Sh LIBRARY .Lb libc .Sh SYNOPSIS n signal.h .Ft int .Fn sigreturn "const ucontext_t *scp" .Sh DESCRIPTION The .Fn sigreturn system call 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 structure pointed to by .Fa scp . 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 specified pc. This system call is used by the trampoline code and .Xr longjmp 3 when returning from a signal to the previously executing program. .Sh RETURN VALUES If successful, the system call does not return. Otherwise, a value of -1 is returned and .Va errno is set to indicate the error. .Sh ERRORS The .Fn sigreturn system call will fail and the process context will remain unchanged if one of the following occurs. l -tag -width Er t Bq Er EFAULT The .Fa scp argument points to memory that is not a valid part of the process address space. t Bq Er EINVAL The process status longword is invalid or would improperly raise the privilege level of the process. .El .Sh SEE ALSO .Xr sigaction 2 , .Xr setjmp 3 , .Xr ucontext 3 .Sh HISTORY The .Fn sigreturn system call appeared in x 4.3 .