ref: dc593372bfc4224c6cf91d2031d0ad0aeadaddfe
dir: /sys/src/cmd/rc/plan9.c/
/*
* 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"
static void execrfork(void);
static void execfinit(void);
builtin Builtin[] = {
"cd", execcd,
"whatis", execwhatis,
"eval", execeval,
"exec", execexec, /* but with popword first */
"exit", execexit,
"shift", execshift,
"wait", execwait,
".", execdot,
"flag", execflag,
"finit", execfinit,
"rfork", execrfork,
0
};
char Rcmain[]="/rc/lib/rcmain";
char Fdprefix[]="/fd/";
char *Signame[] = {
"sigexit", "sighup", "sigint", "sigquit",
"sigalrm", "sigkill", "sigfpe", "sigterm",
0
};
static char *syssigname[] = {
"exit", /* can't happen */
"hangup",
"interrupt",
"quit", /* can't happen */
"alarm",
"kill",
"sys: fp: ",
"term",
0
};
/*
* finit could be removed but is kept for
* backwards compatibility, see: rcmain.plan9
*/
static void
execfinit(void)
{
char *cmds = estrdup("for(i in '/env/fn#'*){. -bq $i}\n");
int line = runq->line;
poplist();
execcmds(openiocore(cmds, strlen(cmds)), estrdup(srcfile(runq)), runq->local, runq->redir);
runq->lex->line = line;
runq->lex->qflag = 1;
}
static void
execrfork(void)
{
int arg;
char *s;
switch(count(runq->argv->words)){
case 1:
arg = RFENVG|RFNAMEG|RFNOTEG;
break;
case 2:
arg = 0;
for(s = runq->argv->words->next->word;*s;s++) switch(*s){
default:
goto Usage;
case 'n':
arg|=RFNAMEG; break;
case 'N':
arg|=RFCNAMEG;
break;
case 'm':
arg|=RFNOMNT; break;
case 'e':
arg|=RFENVG; break;
case 'E':
arg|=RFCENVG; break;
case 's':
arg|=RFNOTEG; break;
case 'f':
arg|=RFFDG; break;
case 'F':
arg|=RFCFDG; break;
}
break;
default:
Usage:
pfmt(err, "Usage: %s [fnesFNEm]\n", runq->argv->words->word);
setstatus("rfork usage");
poplist();
return;
}
if(rfork(arg)==-1){
pfmt(err, "%s: %s failed\n", argv0, runq->argv->words->word);
setstatus("rfork failed");
} else {
if(arg & RFCFDG){
redir *rp;
for(rp = runq->redir; rp; rp = rp->next)
rp->type = 0;
}
setstatus("");
}
poplist();
}
char*
Env(char *name, int fn)
{
static char buf[128];
strcpy(buf, "/env/");
if(fn) strcat(buf, "fn#");
return strncat(buf, name, sizeof(buf)-1);
}
void
Vinit(void)
{
int dir, fd, i, n;
Dir *ent;
dir = Open(Env("", 0), 0);
if(dir<0){
pfmt(err, "%s: can't open: %s\n", argv0, Errstr());
return;
}
for(;;){
ent = 0;
n = dirread(dir, &ent);
if(n <= 0)
break;
for(i = 0; i<n; i++){
if(ent[i].length<=0 || strncmp(ent[i].name, "fn#", 3)==0)
continue;
if((fd = Open(Env(ent[i].name, 0), 0))>=0){
io *f = openiofd(fd);
word *w = 0, **wp = &w;
char *s;
while((s = rstr(f, "")) != 0){
*wp = Newword(s, (word*)0);
wp = &(*wp)->next;
}
closeio(f);
setvar(ent[i].name, w);
vlook(ent[i].name)->changed = 0;
}
}
free(ent);
}
Close(dir);
}
char*
Errstr(void)
{
static char err[ERRMAX];
rerrstr(err, sizeof err);
return err;
}
int
Waitfor(int pid)
{
thread *p;
Waitmsg *w;
if(pid >= 0 && !havewaitpid(pid))
return 0;
while((w = wait()) != nil){
delwaitpid(w->pid);
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;
p->status = estrdup(w->msg);
break;
}
free(w);
}
if(strcmp(Errstr(), "interrupted")==0) return -1;
return 0;
}
static void
addenv(var *v)
{
word *w;
int fd;
io *f;
if(v->changed){
v->changed = 0;
if((fd = Creat(Env(v->name, 0)))<0)
pfmt(err, "%s: can't open: %s\n", argv0, Errstr());
else{
f = openiofd(fd);
for(w = v->val;w;w = w->next){
pstr(f, w->word);
pchr(f, '\0');
}
flushio(f);
closeio(f);
}
}
if(v->fnchanged){
v->fnchanged = 0;
if((fd = Creat(Env(v->name, 1)))<0)
pfmt(err, "%s: can't open: %s\n", argv0, Errstr());
else{
f = openiofd(fd);
if(v->fn)
pfmt(f, "fn %q %s\n", v->name, v->fn[v->pc-1].s);
flushio(f);
closeio(f);
}
}
}
static 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);
if(err)
flushio(err);
}
void
Exec(char **argv)
{
exec(argv[0], argv+1);
}
int
Fork(void)
{
Updenv();
return rfork(RFPROC|RFFDG|RFREND);
}
typedef struct readdir readdir;
struct readdir {
Dir *dbuf;
int i, n;
int fd;
};
void*
Opendir(char *name)
{
readdir *rd;
int fd;
if((fd = Open(name, 0))<0)
return 0;
rd = new(readdir);
rd->dbuf = 0;
rd->i = 0;
rd->n = 0;
rd->fd = fd;
return rd;
}
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;
}
char*
Readdir(void *arg, int onlydirs)
{
readdir *rd = arg;
int n;
Again:
if(rd->i>=rd->n){ /* read */
free(rd->dbuf);
rd->dbuf = 0;
n = dirread(rd->fd, &rd->dbuf);
if(n>0){
if(onlydirs){
n = trimdirs(rd->dbuf, n);
if(n == 0)
goto Again;
}
rd->n = n;
}else
rd->n = 0;
rd->i = 0;
}
if(rd->i>=rd->n)
return 0;
return rd->dbuf[rd->i++].name;
}
void
Closedir(void *arg)
{
readdir *rd = arg;
Close(rd->fd);
free(rd->dbuf);
free(rd);
}
static int interrupted = 0;
static 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;
}
noted(NDFLT);
return;
Out:
if(strcmp(s, "interrupt")!=0 || trap[i]==0){
trap[i]++;
ntrap++;
}
noted(NCONT);
}
void
Trapinit(void)
{
notify(notifyf);
}
long
Write(int fd, void *buf, long cnt)
{
return write(fd, buf, 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
Open(char *file, int mode)
{
static int tab[] = {OREAD,OWRITE,ORDWR,OREAD|ORCLOSE};
return open(file, tab[mode&3]);
}
void
Close(int fd)
{
close(fd);
}
int
Creat(char *file)
{
return create(file, OWRITE, 0666L);
}
int
Dup(int a, int b)
{
return dup(a, b);
}
int
Dup1(int a)
{
return dup(a, -1);
}
void
Exit(void)
{
Updenv();
exits(truestatus()?"":getstatus());
}
int
Eintr(void)
{
return interrupted;
}
void
Noerror(void)
{
interrupted = 0;
}
int
Isatty(int fd)
{
char buf[64];
if(fd2path(fd, buf, sizeof buf) != 0)
return 0;
/* might be /mnt/term/dev/cons */
return strlen(buf) >= 9 && strcmp(buf+strlen(buf)-9, "/dev/cons") == 0;
}
void
Abort(void)
{
abort();
}
static int newwdir;
int
Chdir(char *dir)
{
newwdir = 1;
return chdir(dir);
}
void
Prompt(char *s)
{
pstr(err, s);
flushio(err);
if(newwdir){
char dir[4096];
int fd;
if((fd=Creat("/dev/wdir"))>=0){
getwd(dir, sizeof(dir));
Write(fd, dir, strlen(dir));
Close(fd);
}
newwdir = 0;
}
}