Hi !
I am new to bsd internals and was looking at the implementation of syscall
in sys/i386/i386/trap.c
here its seems we get the handler for the syscall by
if (p->p_sysent->sv_mask)
code &= p->p_sysent->sv_mask;
if (code >= p->p_sysent->sv_size)
callp = &p->p_sysent->sv_table[0];
else
callp = &p->p_sysent->sv_table[code];
and call using
if (error == 0) {
td->td_retval[0] = 0;
td->td_retval[1] = frame.tf_edx;
STOPEVENT(p, S_SCE, narg);
PTRACESTOP_SC(p, td, S_PT_SCE);
error = (*callp->sy_call)(td, args);
}
My question is why we store the p->p_sysent->sv_table
for each process. What is the reason for keeping this per process?
Are there some situations where two processes can have different system calls
available?
Regards,
Ravi
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