return from signal
Standard C Library (libc, -lc)
sigreturn() 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.
If successful, the system call does not return. Otherwise, a value of -1 is
returned and errno is set to indicate the error.
sigreturn() system call will fail and the thread
context will remain unchanged if one of the following occurs.
- The scp argument points to memory that is not a
valid part of the process address space.
- The process status longword is invalid or would improperly raise the
privilege level of the process.
sigreturn() system call appeared in