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 The 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 con- text. 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 pre- viously 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 The sigreturn() 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 improp- erly raise the privilege level of the process. SEE ALSO sigaction(2), setjmp(3), ucontext(3) HISTORY The sigreturn() system call appeared in 4.3BSD. FreeBSD 15.0 September 6, 2013 SIGRETURN(2)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY
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