scp transmits ok but random return code

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LEARN ABOUT FREEBSD

sigreturn

SIGRETURN(2)						      BSD 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 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

     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 improperly raise the privilege level of the process.

SEE ALSO

     sigaction(2), setjmp(3), ucontext(3)

HISTORY

     The sigreturn() system call appeared in 4.3BSD.

BSD
								 September 6, 2013							       BSD

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