acme: add missing logf.c
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202
sys/src/cmd/acme/logf.c
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202
sys/src/cmd/acme/logf.c
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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <thread.h>
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#include <cursor.h>
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#include <mouse.h>
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#include <keyboard.h>
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#include <frame.h>
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#include <fcall.h>
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#include <plumb.h>
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#include <libsec.h>
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#include "dat.h"
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#include "fns.h"
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// State for global log file.
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typedef struct Log Log;
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struct Log
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{
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QLock lk;
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Rendez r;
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vlong start; // msg[0] corresponds to 'start' in the global sequence of events
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// queued events (nev=entries in ev, mev=capacity of p)
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char **ev;
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int nev;
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int mev;
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// open acme/put files that need to read events
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Fid **f;
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int nf;
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int mf;
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// active (blocked) reads waiting for events
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Xfid **read;
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int nread;
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int mread;
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};
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static Log eventlog;
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void
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xfidlogopen(Xfid *x)
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{
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qlock(&eventlog.lk);
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if(eventlog.nf >= eventlog.mf) {
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eventlog.mf = eventlog.mf*2;
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if(eventlog.mf == 0)
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eventlog.mf = 8;
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eventlog.f = erealloc(eventlog.f, eventlog.mf*sizeof eventlog.f[0]);
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}
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eventlog.f[eventlog.nf++] = x->f;
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x->f->logoff = eventlog.start + eventlog.nev;
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qunlock(&eventlog.lk);
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}
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void
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xfidlogclose(Xfid *x)
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{
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int i;
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qlock(&eventlog.lk);
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for(i=0; i<eventlog.nf; i++) {
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if(eventlog.f[i] == x->f) {
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eventlog.f[i] = eventlog.f[--eventlog.nf];
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break;
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}
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}
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qunlock(&eventlog.lk);
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}
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void
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xfidlogread(Xfid *x)
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{
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char *p;
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int i;
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Fcall fc;
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qlock(&eventlog.lk);
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if(eventlog.nread >= eventlog.mread) {
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eventlog.mread = eventlog.mread*2;
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if(eventlog.mread == 0)
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eventlog.mread = 8;
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eventlog.read = erealloc(eventlog.read, eventlog.mread*sizeof eventlog.read[0]);
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}
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eventlog.read[eventlog.nread++] = x;
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if(eventlog.r.l == nil)
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eventlog.r.l = &eventlog.lk;
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x->flushed = FALSE;
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while(x->f->logoff >= eventlog.start+eventlog.nev && !x->flushed)
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rsleep(&eventlog.r);
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for(i=0; i<eventlog.nread; i++) {
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if(eventlog.read[i] == x) {
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eventlog.read[i] = eventlog.read[--eventlog.nread];
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break;
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}
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}
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if(x->flushed) {
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qunlock(&eventlog.lk);
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return;
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}
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i = x->f->logoff - eventlog.start;
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p = estrdup(eventlog.ev[i]);
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x->f->logoff++;
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qunlock(&eventlog.lk);
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fc.data = p;
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fc.count = strlen(p);
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respond(x, &fc, nil);
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free(p);
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}
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void
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xfidlogflush(Xfid *x)
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{
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int i;
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Xfid *rx;
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qlock(&eventlog.lk);
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for(i=0; i<eventlog.nread; i++) {
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rx = eventlog.read[i];
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if(rx->tag == x->oldtag) {
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rx->flushed = TRUE;
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rwakeupall(&eventlog.r);
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}
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}
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qunlock(&eventlog.lk);
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}
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/*
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* add a log entry for op on w.
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* expected calls:
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*
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* op == "new" for each new window
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* - caller of coladd or makenewwindow responsible for calling
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* xfidlog after setting window name
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* - exception: zerox
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*
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* op == "zerox" for new window created via zerox
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* - called from zeroxx
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*
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* op == "get" for Get executed on window
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* - called from get
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*
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* op == "put" for Put executed on window
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* - called from put
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*
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* op == "del" for deleted window
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* - called from winclose
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*
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* op == "focus" for window focus change
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* - called from mousethread
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*/
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void
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xfidlog(Window *w, char *op)
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{
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int i, n;
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vlong min;
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File *f;
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char *name;
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qlock(&eventlog.lk);
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if(eventlog.nev >= eventlog.mev) {
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// Remove and free any entries that all readers have read.
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min = eventlog.start + eventlog.nev;
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for(i=0; i<eventlog.nf; i++) {
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if(min > eventlog.f[i]->logoff)
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min = eventlog.f[i]->logoff;
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}
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if(min > eventlog.start) {
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n = min - eventlog.start;
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for(i=0; i<n; i++)
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free(eventlog.ev[i]);
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eventlog.nev -= n;
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eventlog.start += n;
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memmove(eventlog.ev, eventlog.ev+n, eventlog.nev*sizeof eventlog.ev[0]);
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}
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// Otherwise grow.
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if(eventlog.nev >= eventlog.mev) {
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eventlog.mev = eventlog.mev*2;
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if(eventlog.mev == 0)
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eventlog.mev = 8;
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eventlog.ev = erealloc(eventlog.ev, eventlog.mev*sizeof eventlog.ev[0]);
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}
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}
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f = w->body.file;
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name = runetobyte(f->name, f->nname);
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if(name == nil)
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name = estrdup("");
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eventlog.ev[eventlog.nev++] = smprint("%d %s %s\n", w->id, op, name);
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free(name);
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if(eventlog.r.l == nil)
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eventlog.r.l = &eventlog.lk;
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rwakeupall(&eventlog.r);
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qunlock(&eventlog.lk);
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}
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