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SIGRETURN(2) | System Calls Manual | SIGRETURN(2) |
NAME¶
sigreturn
—
return from signal
LIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include
<signal.h>
int
sigreturn
(const
ucontext_t *scp);
DESCRIPTION¶
Thesigreturn
() system call allows users to
atomically unmask, switch stacks, and return from a signal context. The
thread's signal mask and stack status are restored from the context structure
pointed to by 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
longjmp(3) when returning from a signal to the
previously executing program.
RETURN VALUES¶
If successful, the system call does not return. Otherwise, a value of -1 is returned and errno is set to indicate the error.ERRORS¶
Thesigreturn
() system call will fail and the
thread context will remain unchanged if one of the following occurs.
- [
EFAULT
] - The scp argument 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.
SEE ALSO¶
sigaction(2), setjmp(3), ucontext(3)HISTORY¶
Thesigreturn
() system call appeared in
4.3BSD.September 6, 2013 | Debian |