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/*
* Plan 9 versions of system-specific functions
* By convention, exported routines herein have names beginning with an
* upper case letter.
*/
#include "rc.h"
#include "exec.h"
#include "io.h"
#include "fns.h"
#include "getflags.h"
char *Signame[] = {
"sigexit", "sighup", "sigint", "sigquit",
"sigalrm", "sigkill", "sigfpe", "sigterm",
0
};
char *syssigname[] = {
"exit", /* can't happen */
"hangup",
"interrupt",
"quit", /* can't happen */
"alarm",
"kill",
"sys: fp: ",
"term",
0
};
char *Rcmain = "/rc/lib/rcmain";
char *Fdprefix = "/fd/";
void execfinit(void);
void execbind(void);
builtin Builtin[] = {
"cd", execcd,
"whatis", execwhatis,
"eval", execeval,
"exec", execexec, /* but with popword first */
"exit", execexit,
"shift", execshift,
"wait", execwait,
".", execdot,
"finit", execfinit,
"flag", execflag,
0
};
void
Vinit(void)
{
int dir, f, len;
word *val;
char *buf, *s;
Dir *ent;
int i, nent;
char envname[256];
dir = open("/env", OREAD);
if(dir<0){
pfmt(err, "rc: can't open /env: %r\n");
return;
}
ent = nil;
for(;;){
nent = dirread(dir, &ent);
if(nent <= 0)
break;
for(i = 0; i<nent; i++){
len = ent[i].length;
if(len && strncmp(ent[i].name, "fn#", 3)!=0){
snprint(envname, sizeof envname, "/env/%s", ent[i].name);
if((f = open(envname, 0))>=0){
buf = emalloc((int)len+1);
read(f, buf, (long)len);
val = 0;
/* Charitably add a 0 at the end if need be */
if(buf[len-1])
buf[len++]='\0';
s = buf+len-1;
for(;;){
while(s!=buf && s[-1]!='\0') --s;
val = newword(s, val);
if(s==buf)
break;
--s;
}
setvar(ent[i].name, val);
vlook(ent[i].name)->changed = 0;
close(f);
efree(buf);
}
}
}
free(ent);
}
close(dir);
}
int envdir;
void
Xrdfn(void)
{
int f, len;
static Dir *ent, *allocent;
static int nent;
Dir *e;
char envname[256];
for(;;){
if(nent == 0){
free(allocent);
nent = dirread(envdir, &allocent);
ent = allocent;
}
if(nent <= 0)
break;
while(nent){
e = ent++;
nent--;
len = e->length;
if(len && strncmp(e->name, "fn#", 3)==0){
snprint(envname, sizeof envname, "/env/%s", e->name);
if((f = open(envname, 0))>=0){
execcmds(openfd(f));
return;
}
}
}
}
close(envdir);
Xreturn();
}
union code rdfns[4];
void
execfinit(void)
{
static int first = 1;
if(first){
rdfns[0].i = 1;
rdfns[1].f = Xrdfn;
rdfns[2].f = Xjump;
rdfns[3].i = 1;
first = 0;
}
Xpopm();
envdir = open("/env", 0);
if(envdir<0){
pfmt(err, "rc: can't open /env: %r\n");
return;
}
start(rdfns, 1, runq->local);
}
int
Waitfor(int pid, int persist)
{
thread *p;
Waitmsg *w;
char errbuf[ERRMAX];
while((w = wait()) != nil){
if(w->pid==pid){
setstatus(w->msg);
free(w);
return 0;
}
for(p = runq->ret;p;p = p->ret)
if(p->pid==w->pid){
p->pid=-1;
strcpy(p->status, w->msg);
}
free(w);
}
errstr(errbuf, sizeof errbuf);
if(strcmp(errbuf, "interrupted")==0) return -1;
return 0;
}
char*
*mkargv(word *a)
{
char **argv = (char **)emalloc((count(a)+2)*sizeof(char *));
char **argp = argv+1; /* leave one at front for runcoms */
for(;a;a = a->next) *argp++=a->word;
*argp = 0;
return argv;
}
void
addenv(var *v)
{
char envname[256];
word *w;
int f;
io *fd;
if(v->changed){
v->changed = 0;
snprint(envname, sizeof envname, "/env/%s", v->name);
if((f = Creat(envname))<0)
pfmt(err, "rc: can't open %s: %r\n", envname);
else{
for(w = v->val;w;w = w->next)
write(f, w->word, strlen(w->word)+1L);
close(f);
}
}
if(v->fnchanged){
v->fnchanged = 0;
snprint(envname, sizeof envname, "/env/fn#%s", v->name);
if((f = Creat(envname))<0)
pfmt(err, "rc: can't open %s: %r\n", envname);
else{
if(v->fn){
fd = openfd(f);
pfmt(fd, "fn %q %s\n", v->name, v->fn[v->pc-1].s);
closeio(fd);
}
close(f);
}
}
}
void
updenvlocal(var *v)
{
if(v){
updenvlocal(v->next);
addenv(v);
}
}
void
Updenv(void)
{
var *v, **h;
for(h = gvar;h!=&gvar[NVAR];h++)
for(v=*h;v;v = v->next)
addenv(v);
if(runq)
updenvlocal(runq->local);
}
int
ForkExecute(char *file, char **argv, int sin, int sout, int serr)
{
int pid;
{int i;
fprint(2, "forkexec %s", file);
for(i = 0; argv[i]; i++)fprint(2, " %s", argv[i]);
fprint(2, " %d %d %d\n", sin, sout, serr);
}
if(access(file, 1) != 0)
return -1;
fprint(2, "forking\n");
switch(pid = fork()){
case -1:
return -1;
case 0:
if(sin >= 0)
dup(sin, 0);
else
close(0);
if(sout >= 0)
dup(sout, 1);
else
close(1);
if(serr >= 0)
dup(serr, 2);
else
close(2);
fprint(2, "execing\n");
exec(file, argv);
fprint(2, "exec: %r\n");
exits(file);
}
return pid;
}
void
Execute(word *args, word *path)
{
char **argv = mkargv(args);
char file[1024];
int nc;
Updenv();
for(;path;path = path->next){
nc = strlen(path->word);
if(nc<1024){
strcpy(file, path->word);
if(file[0]){
strcat(file, "/");
nc++;
}
if(nc+strlen(argv[1])<1024){
strcat(file, argv[1]);
exec(file, argv+1);
}
else werrstr("command name too long");
}
}
rerrstr(file, sizeof file);
pfmt(err, "%s: %s\n", argv[1], file);
efree((char *)argv);
}
#define NDIR 256 /* shoud be a better way */
int
Globsize(char *p)
{
int isglob = 0, globlen = NDIR+1;
for(;*p;p++){
if(*p==GLOB){
p++;
if(*p!=GLOB)
isglob++;
globlen+=*p=='*'?NDIR:1;
}
else
globlen++;
}
return isglob?globlen:0;
}
#define NFD 50
#define NDBUF 32
struct{
Dir *dbuf;
int i;
int n;
}dir[NFD];
int
Opendir(char *name)
{
Dir *db;
int f;
f = open(name, 0);
if(f==-1)
return f;
db = dirfstat(f);
if(db!=nil && (db->mode&DMDIR)){
if(f<NFD){
dir[f].i = 0;
dir[f].n = 0;
}
free(db);
return f;
}
free(db);
close(f);
return -1;
}
static int
trimdirs(Dir *d, int nd)
{
int r, w;
for(r=w=0; r<nd; r++)
if(d[r].mode&DMDIR)
d[w++] = d[r];
return w;
}
/*
* onlydirs is advisory -- it means you only
* need to return the directories. it's okay to
* return files too (e.g., on unix where you can't
* tell during the readdir), but that just makes
* the globber work harder.
*/
int
Readdir(int f, void *p, int onlydirs)
{
int n;
if(f<0 || f>=NFD)
return 0;
Again:
if(dir[f].i==dir[f].n){ /* read */
free(dir[f].dbuf);
dir[f].dbuf = 0;
n = dirread(f, &dir[f].dbuf);
if(n>0){
if(onlydirs){
n = trimdirs(dir[f].dbuf, n);
if(n == 0)
goto Again;
}
dir[f].n = n;
}else
dir[f].n = 0;
dir[f].i = 0;
}
if(dir[f].i == dir[f].n)
return 0;
strcpy(p, dir[f].dbuf[dir[f].i].name);
dir[f].i++;
return 1;
}
void
Closedir(int f)
{
if(f>=0 && f<NFD){
free(dir[f].dbuf);
dir[f].i = 0;
dir[f].n = 0;
dir[f].dbuf = 0;
}
close(f);
}
int interrupted = 0;
void
notifyf(void*, char *s)
{
int i;
for(i = 0;syssigname[i];i++) if(strncmp(s, syssigname[i], strlen(syssigname[i]))==0){
if(strncmp(s, "sys: ", 5)!=0) interrupted = 1;
goto Out;
}
pfmt(err, "rc: note: %s\n", s);
noted(NDFLT);
return;
Out:
if(strcmp(s, "interrupt")!=0 || trap[i]==0){
trap[i]++;
ntrap++;
}
if(ntrap>=32){ /* rc is probably in a trap loop */
pfmt(err, "rc: Too many traps (trap %s), aborting\n", s);
abort();
}
noted(NCONT);
}
void
Trapinit(void)
{
notify(notifyf);
}
void
Unlink(char *name)
{
remove(name);
}
long
Write(int fd, void *buf, long cnt)
{
return write(fd, buf, (long)cnt);
}
long
Read(int fd, void *buf, long cnt)
{
return read(fd, buf, cnt);
}
long
Seek(int fd, long cnt, long whence)
{
return seek(fd, cnt, whence);
}
int
Executable(char *file)
{
Dir *statbuf;
int ret;
statbuf = dirstat(file);
if(statbuf == nil)
return 0;
ret = ((statbuf->mode&0111)!=0 && (statbuf->mode&DMDIR)==0);
free(statbuf);
return ret;
}
int
Creat(char *file)
{
return create(file, 1, 0666L);
}
int
Dup(int a, int b)
{
return dup(a, b);
}
int
Dup1(int)
{
return -1;
}
void
Exit(char *stat)
{
Updenv();
setstatus(stat);
exits(truestatus()?"":getstatus());
}
int
Eintr(void)
{
return interrupted;
}
void
Noerror(void)
{
interrupted = 0;
}
int
Isatty(int fd)
{
Dir *d1, *d2;
int ret;
d1 = dirfstat(fd);
if(d1 == nil)
return 0;
if(strncmp(d1->name, "ptty", 4)==0){ /* fwd complaints to philw */
free(d1);
return 1;
}
d2 = dirstat("/dev/cons");
if(d2 == nil){
free(d1);
return 0;
}
ret = (d1->type==d2->type&&d1->dev==d2->dev&&d1->qid.path==d2->qid.path);
free(d1);
free(d2);
return ret;
}
void
Abort(void)
{
pfmt(err, "aborting\n");
flush(err);
Exit("aborting");
}
void
Memcpy(void *a, void *b, long n)
{
memmove(a, b, n);
}
void*
Malloc(ulong n)
{
return malloc(n);
}