#include "vmhdr.h" /* Set the control flags for a region. ** ** Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94. */ #if __STD_C int vmset(reg Vmalloc_t* vm, int flags, int on) #else int vmset(vm, flags, on) reg Vmalloc_t* vm; /* region being worked on */ int flags; /* flags must be in VM_FLAGS */ int on; /* !=0 if turning on, else turning off */ #endif { reg int mode; reg Vmdata_t* vd = vm->data; if(flags == 0 && on == 0) return vd->mode; if(!(vd->mode&VM_TRUST) ) { if(ISLOCK(vd,0)) return 0; SETLOCK(vd,0); } mode = vd->mode; if(on) vd->mode |= (flags&VM_FLAGS); else vd->mode &= ~(flags&VM_FLAGS); if(vd->mode&(VM_TRACE|VM_MTDEBUG)) vd->mode &= ~VM_TRUST; CLRLOCK(vd,0); return mode; }