1993/0725/port/sysproc.c (diff list | history)

port/sysproc.c on 1990/0227
1990/0227		#include "u.h"
1992/0321		#include "../port/lib.h"
1990/0227		#include "mem.h" #include "dat.h" #include "fns.h"
1992/0111		#include "../port/error.h"
1990/0227
1990/0330		#include <a.out.h>
1990/0227		int shargs(char*, int, char**); long sysr1(ulong *arg) {
1993/0501		Chan *c; c = fdtochan(arg[0], -1, 0, 0); ptpath(c->path, (char*)arg[1], arg[2]);
1990/0227		return 0; } long
1991/0807		sysrfork(ulong *arg) {
1993/0501		Proc *p; int n, i;
1992/0428		Pgrp *opg; Egrp *oeg; Fgrp *ofg;
1993/0501		ulong pid, flag;
1991/0709
1992/1206		flag = arg[0];
1992/0501		if((flag&RFPROC) == 0) { if(flag & (RFNAMEG|RFCNAMEG)) { if((flag & (RFNAMEG|RFCNAMEG)) == (RFNAMEG|RFCNAMEG))
1992/0428		error(Ebadarg);
1993/0501		opg = up->pgrp; up->pgrp = newpgrp();
1992/0501		if(flag & RFNAMEG)
1993/0501		pgrpcpy(up->pgrp, opg);
1992/0428		closepgrp(opg); }
1992/0501		if(flag & (RFENVG|RFCENVG)) { if((flag & (RFENVG|RFCENVG)) == (RFENVG|RFCENVG))
1992/0428		error(Ebadarg);
1993/0501		oeg = up->egrp; up->egrp = smalloc(sizeof(Egrp)); up->egrp->ref = 1;
1992/0501		if(flag & RFENVG)
1993/0501		envcpy(up->egrp, oeg);
1992/0428		closeegrp(oeg); }
1992/0607		if(flag & RFFDG) {
1993/0501		ofg = up->fgrp; up->fgrp = dupfgrp(ofg);
1992/0607		closefgrp(ofg); } else
1992/0501		if(flag & RFCFDG) {
1993/0501		ofg = up->fgrp; up->fgrp = smalloc(sizeof(Fgrp)); up->fgrp->ref = 1;
1992/0428		closefgrp(ofg); }
1992/0501		if(flag & RFNOTEG)
1993/0501		up->noteid = incref(¬eidalloc);
1992/0501		if(flag & (RFMEM|RFNOWAIT))
1992/0428		error(Ebadarg); return 0; }
1992/0430		/* Check flags before we commit */
1992/0501		if((flag & (RFFDG|RFCFDG)) == (RFFDG|RFCFDG))
1992/0430		error(Ebadarg);
1992/0501		if((flag & (RFNAMEG|RFCNAMEG)) == (RFNAMEG|RFCNAMEG))
1992/0430		error(Ebadarg);
1992/0501		if((flag & (RFENVG|RFCENVG)) == (RFENVG|RFCENVG))
1992/0430		error(Ebadarg);
1992/0428
1990/0227		p = newproc();
1991/0705
1993/0501		p->fpsave = up->fpsave; p->scallnr = up->scallnr; p->s = up->s; p->nerrlab = 0; p->slash = up->slash; p->dot = up->dot; incref(p->dot);
1990/0614
1993/0501		memmove(p->note, up->note, sizeof(p->note)); p->nnote = up->nnote; p->notified = 0; p->lastnote = up->lastnote; p->notify = up->notify; p->ureg = 0; p->dbgreg = 0;
1990/0227
1991/0705		/* Make a new set of memory segments */
1992/0501		n = flag & RFMEM;
1991/0705		for(i = 0; i < NSEG; i++)
1993/0501		if(up->seg[i]) p->seg[i] = dupseg(up->seg, i, n);
1991/0705
1992/0428		/* File descriptors */
1992/0501		if(flag & (RFFDG|RFCFDG)) { if(flag & RFFDG)
1993/0501		p->fgrp = dupfgrp(up->fgrp);
1992/0623		else { p->fgrp = smalloc(sizeof(Fgrp)); p->fgrp->ref = 1; }
1992/0428		} else {
1993/0501		p->fgrp = up->fgrp;
1991/0807		incref(p->fgrp); }
1991/0705
1992/0428		/* Process groups */
1992/0501		if(flag & (RFNAMEG|RFCNAMEG)) {
1992/0928		p->pgrp = newpgrp(); if(flag & RFNAMEG)
1993/0501		pgrpcpy(p->pgrp, up->pgrp);
1991/0807		}
1991/0808		else {
1993/0501		p->pgrp = up->pgrp;
1991/0808		incref(p->pgrp); }
1991/0705
1992/0428		/* Environment group */
1992/0501		if(flag & (RFENVG|RFCENVG)) {
1992/0623		p->egrp = smalloc(sizeof(Egrp)); p->egrp->ref = 1; if(flag & RFENVG)
1993/0501		envcpy(p->egrp, up->egrp);
1991/0807		}
1991/0808		else {
1993/0501		p->egrp = up->egrp;
1991/0808		incref(p->egrp); }
1991/0807
1993/0501		p->hang = up->hang; p->procmode = up->procmode;
1991/1110
1993/0501		/* Craft a return frame which will cause the child to pop out of * the scheduler in user mode with the return register zero */ forkchild(p, up->dbgreg); p->parent = up; p->parentpid = up->pid;
1992/0501		if(flag&RFNOWAIT)
1992/0430		p->parentpid = 1;
1992/0715		else {
1993/0501		lock(&up->exl); up->nchild++; unlock(&up->exl);
1992/0715		}
1992/0501		if((flag&RFNOTEG) == 0)
1993/0501		p->noteid = up->noteid;
1991/0705
1993/0501		p->fpstate = up->fpstate;
1990/0227		pid = p->pid; memset(p->time, 0, sizeof(p->time)); p->time[TReal] = MACHP(0)->ticks;
1993/0501		memmove(p->text, up->text, NAMELEN); memmove(p->user, up->user, NAMELEN);
1991/0529		/* * since the bss/data segments are now shareable, * any mmu info about this process is now stale * (i.e. has bad properties) and has to be discarded. */
1990/0227		flushmmu();
1991/0430		ready(p);
1990/0227		return pid; }
1991/0723		static ulong l2be(long l) { uchar *cp; cp = (uchar*)&l; return (cp[0]<<24) | (cp[1]<<16) | (cp[2]<<8) | cp[3]; }
1990/0227		long sysexec(ulong *arg) {
1991/0705		Segment *s, *ts;
1992/0711		ulong t, d, b;
1990/0227		int i;
1992/0711		Chan *tc;
1990/0227		char **argv, **argp; char *a, *charp, *file; char *progarg[sizeof(Exec)/2+1], elem[NAMELEN];
1991/0523		ulong ssize, spage, nargs, nbytes, n, bssend;
1990/0227		int indir; Exec exec; char line[sizeof(Exec)];
1991/0705		Fgrp *f; Image *img;
1991/0723		ulong magic, text, entry, data, bss;
1990/0227		validaddr(arg[0], 1, 0); file = (char*)arg[0]; indir = 0; Header: tc = namec(file, Aopen, OEXEC, 0); if(waserror()){ close(tc); nexterror(); } if(!indir)
1993/0501		strcpy(elem, up->elem);
1991/0706
1991/0411		n = (*devtab[tc->type].read)(tc, &exec, sizeof(Exec), 0);
1990/0227		if(n < 2) Err:
1990/11211		error(Ebadexec);
1991/0723		magic = l2be(exec.magic); text = l2be(exec.text); entry = l2be(exec.entry); if(n==sizeof(Exec) && magic==AOUT_MAGIC){ if((text&KZERO) || entry < UTZERO+sizeof(Exec) || entry >= UTZERO+sizeof(Exec)+text)
1990/0227		goto Err; goto Binary; } /* * Process #! /bin/sh args ... */
1991/0318		memmove(line, &exec, sizeof(Exec));
1990/0227		if(indir || line[0]!='#' || line[1]!='!') goto Err; n = shargs(line, n, progarg); if(n == 0) goto Err; indir = 1; /* * First arg becomes complete file name */ progarg[n++] = file; progarg[n] = 0; validaddr(arg[1], BY2WD, 1); arg[1] += BY2WD; file = progarg[0]; progarg[0] = elem; poperror();
1991/0614		close(tc);
1990/0227		goto Header; Binary:
1991/0705		poperror();
1991/0723		data = l2be(exec.data); bss = l2be(exec.bss); t = (UTZERO+sizeof(Exec)+text+(BY2PG-1)) & ~(BY2PG-1); d = (t + data + (BY2PG-1)) & ~(BY2PG-1); bssend = t + data + bss;
1990/1211		b = (bssend + (BY2PG-1)) & ~(BY2PG-1);
1990/0227		if((t|d|b) & KZERO)
1990/11211		error(Ebadexec);
1990/0227		/* * Args: pass 1: count */
1991/0710		nbytes = BY2WD; /* hole for profiling clock at top of stack */
1990/0227		nargs = 0; if(indir){ argp = progarg; while(*argp){ a = *argp++; nbytes += strlen(a) + 1; nargs++; } } evenaddr(arg[1]); argp = (char**)arg[1]; validaddr((ulong)argp, BY2WD, 0); while(*argp){ a = *argp++; if(((ulong)argp&(BY2PG-1)) < BY2WD) validaddr((ulong)argp, BY2WD, 0); validaddr((ulong)a, 1, 0);
1993/0227		nbytes += (vmemchr(a, 0, 0x7FFFFFFF) - a) + 1;
1990/1226		nargs++;
1990/0227		} ssize = BY2WD*(nargs+1) + ((nbytes+(BY2WD-1)) & ~(BY2WD-1));
1992/0923
1992/0802		/* * 8-byte align SP for those (e.g. sparc) that need it. * execregs() will subtract another 4 bytes for argc. */ if((ssize+4) & 7) ssize += 4;
1990/0227		spage = (ssize+(BY2PG-1)) >> PGSHIFT;
1993/0725		print("ssize %d spage %lux\n", ssize, spage);
1990/0227		/* * Build the stack segment, putting it in kernel virtual for the moment */
1991/0523		if(spage > TSTKSIZ)
1992/0114		error(Enovmem);
1991/0522
1993/0501		up->seg[ESEG] = newseg(SG_STACK, TSTKTOP-USTKSIZE, USTKSIZE/BY2PG);
1990/0227		/* * Args: pass 2: assemble; the pages will be faulted in */ argv = (char**)(TSTKTOP - ssize); charp = (char*)(TSTKTOP - nbytes); if(indir) argp = progarg; else argp = (char**)arg[1];
1991/0705
1990/0227		for(i=0; i<nargs; i++){
1991/0705		if(indir && *argp==0) {
1990/0227		indir = 0; argp = (char**)arg[1]; } *argv++ = charp + (USTKTOP-TSTKTOP);
1993/0725		print("arg[%d] %s\n", i, *argp);
1990/0227		n = strlen(*argp) + 1;
1991/0318		memmove(charp, *argp++, n);
1990/0227		charp += n; }
1993/0501		memmove(up->text, elem, NAMELEN);
1990/0227		/*
1992/1206		* Committed. * Free old memory. * Special segments are maintained accross exec
1990/0227		*/
1991/0709		for(i = SSEG; i <= BSEG; i++) {
1993/0501		putseg(up->seg[i]); up->seg[i] = 0; /* prevent a second free if we have an error */
1991/0709		}
1990/08141		/* * Close on exec */
1993/0501		f = up->fgrp;
1991/0705		for(i=0; i<=f->maxfd; i++) fdclose(i, CCEXEC);
1990/0227
1991/0705		/* Text. Shared. Attaches to cache image if possible */
1991/0724		/* attachimage returns a locked cache image */
1991/0705		img = attachimage(SG_TEXT|SG_RONLY, tc, UTZERO, (t-UTZERO)>>PGSHIFT); ts = img->s;
1993/0501		up->seg[TSEG] = ts;
1991/0706		ts->flushme = 1;
1991/0705		ts->fstart = 0;
1991/0723		ts->flen = sizeof(Exec)+text;
1991/0724		unlock(img);
1990/0227
1991/0705		/* Data. Shared. */ s = newseg(SG_DATA, t, (d-t)>>PGSHIFT);
1993/0501		up->seg[DSEG] = s;
1990/0227
1991/0705		/* Attached by hand */ incref(img); s->image = img; s->fstart = ts->fstart+ts->flen;
1991/0723		s->flen = data;
1990/0227
1991/0705		/* BSS. Zero fill on demand */
1993/0501		up->seg[BSEG] = newseg(SG_BSS, d, (b-d)>>PGSHIFT);
1990/1211
1990/0227		/* * Move the stack */
1993/0501		s = up->seg[ESEG]; up->seg[ESEG] = 0; up->seg[SSEG] = s;
1991/0705		s->base = USTKTOP-USTKSIZE; s->top = USTKTOP;
1993/0502		relocateseg(s, USTKTOP-TSTKTOP);
1990/0227
1991/0706		close(tc);
1991/0705
1991/0529		/*
1991/0705		* At this point, the mmu contains info about the old address
1991/0529		* space and needs to be flushed */
1990/0227		flushmmu();
1993/0501		qlock(&up->debug); up->nnote = 0; up->notify = 0; up->notified = 0; procsetup(up); qunlock(&up->debug); if(up->hang) up->procctl = Proc_stopme;
1991/1110
1991/1214		return execregs(entry, ssize, nargs);
1990/0227		} int shargs(char *s, int n, char **ap) { int i;
1992/0928		s += 2; n -= 2; /* skip #! */
1990/0227		for(i=0; s[i]!='\n'; i++) if(i == n-1) return 0; s[i] = 0; *ap = 0; i = 0;
1993/0501		for(;;) {
1990/0227		while(*s==' ' || *s=='\t') s++; if(*s == 0) break; i++; *ap++ = s; *ap = 0; while(*s && *s!=' ' && *s!='\t') s++; if(*s == 0) break; else *s++ = 0; } return i; } int return0(void *a) {
1991/1115		USED(a);
1990/0227		return 0; } long syssleep(ulong *arg) {
1991/1219		if(arg[0] == 0) sched(); else
1993/0501		tsleep(&up->sleep, return0, 0, arg[0]);
1991/1219
1990/0227		return 0; }
1991/0513		long sysalarm(ulong *arg) { return procalarm(arg[0]); }
1990/0227		long sysexits(ulong *arg) { char *status;
1991/0808		char *inval = "invalid exit string";
1990/0227		status = (char*)arg[0]; if(status){ if(waserror())
1991/0808		status = inval;
1990/0227		else{ validaddr((ulong)status, 1, 0);
1991/0808		if(vmemchr(status, 0, ERRLEN) == 0) status = inval;
1990/0227		}
1991/0614		poperror();
1991/0705
1990/0227		} pexit(status, 1);
1992/0520		return 0; /* not reached */
1990/0227		} long syswait(ulong *arg) { if(arg[0]){ validaddr(arg[0], sizeof(Waitmsg), 1); evenaddr(arg[0]); } return pwait((Waitmsg*)arg[0]); } long
1990/11211		sysdeath(ulong *arg)
1990/0227		{
1991/1115		USED(arg);
1992/0628		pprint("deprecated system call\n");
1990/11211		pexit("Suicide", 0);
1992/0520		return 0; /* not reached */
1990/0227		} long syserrstr(ulong *arg) {
1993/0501		char *e, tmp[ERRLEN];
1993/0324
1990/11211		validaddr(arg[0], ERRLEN, 1);
1993/0501		e = (char*)arg[0]; memmove(tmp, e, ERRLEN); memmove(e, up->error, ERRLEN); memmove(up->error, tmp, ERRLEN);
1990/0227		return 0; } long sysnotify(ulong *arg) {
1991/1115		USED(arg);
1991/0326		if(arg[0] != 0) validaddr(arg[0], sizeof(ulong), 0);
1993/0501		up->notify = (int(*)(void*, char*))(arg[0]);
1990/0227		return 0; } long sysnoted(ulong *arg) {
1991/1115		USED(arg);
1993/0501		if(up->notified == 0)
1990/11211		error(Egreg);
1990/0227		return 0; } long
1991/0705		syssegbrk(ulong *arg)
1990/0227		{
1991/0705		int i;
1993/0501		ulong addr; Segment *s;
1991/0705
1993/0501		addr = arg[0]; for(i = 0; i < NSEG; i++) { s = up->seg[i]; if(s == 0 || addr < s->base || addr >= s->top) continue; switch(s->type&SG_TYPE) { case SG_TEXT: case SG_DATA: error(Ebadarg); default: return ibrk(arg[1], i);
1991/0705		}
1993/0501		}
1991/0705
1992/0114		error(Ebadarg);
1992/0520		return 0; /* not reached */
1990/0227		}
1991/0606
1991/0605		long
1991/0705		syssegattach(ulong *arg)
1991/0605		{
1993/0501		return segattach(up, arg[0], (char*)arg[1], arg[2], arg[3]);
1991/0705		} long syssegdetach(ulong *arg) { int i;
1993/0501		ulong addr;
1991/0705		Segment *s;
1991/0723		s = 0;
1993/0501		addr = arg[0];
1991/0705		for(i = 0; i < NSEG; i++)
1993/0501		if(s = up->seg[i]) {
1991/0705		qlock(&s->lk);
1993/0501		if((addr >= s->base && addr < s->top) || (s->top == s->base && addr == s->base))
1991/0705		goto found; qunlock(&s->lk); }
1992/0114		error(Ebadarg);
1991/0705		found:
1993/0501		/* Check we are not detaching the current stack segment */
1991/0705		if((ulong)arg >= s->base && (ulong)arg < s->top) { qunlock(&s->lk);
1992/0114		error(Ebadarg);
1991/0705		}
1993/0501		up->seg[i] = 0;
1991/0705		qunlock(&s->lk); putseg(s); /* Ensure we flush any entries from the lost segment */ flushmmu(); return 0; } long syssegfree(ulong *arg) { Segment *s;
1991/0712		ulong from, pages;
1991/0705
1991/0706		from = PGROUND(arg[0]);
1993/0501		s = seg(up, from, 1);
1991/0705		if(s == 0)
1992/0114		error(Ebadarg);
1991/0705
1991/0712		pages = (arg[1]+BY2PG-1)/BY2PG;
1991/0705
1991/0712		if(from+pages*BY2PG > s->top) {
1991/0705		qunlock(&s->lk);
1992/0114		error(Ebadarg);
1991/0705		}
1991/0712		mfreeseg(s, from, pages);
1991/0705		qunlock(&s->lk);
1992/1206		flushmmu();
1991/0705		return 0; } /* For binary compatability */ long sysbrk_(ulong *arg) { return ibrk(arg[0], BSEG);
1991/0605		}
1991/0806		long sysrendezvous(ulong *arg) {
1992/0711		Proc *p, **l;
1991/0806		int s, tag; ulong val; tag = arg[0];
1993/0501		l = &REND(up->pgrp, tag);
1991/0806
1993/0501		lock(up->pgrp);
1991/0806		for(p = *l; p; p = p->rendhash) { if(p->rendtag == tag) { *l = p->rendhash; val = p->rendval; p->rendval = arg[1];
1992/1206		/* Easy race avoidance */
1991/0807		while(p->state != Rendezvous) ;
1991/0806		ready(p);
1993/0501		unlock(up->pgrp);
1991/0806		return val; } l = &p->rendhash; } /* Going to sleep here */
1993/0501		up->rendtag = tag; up->rendval = arg[1]; up->rendhash = *l; *l = up;
1991/0806		s = splhi();
1993/0501		unlock(up->pgrp); up->state = Rendezvous;
1991/0806		sched(); splx(s);
1993/0501		return up->rendval;
1991/0806		}