pid_t
setsid(void)
{
if(_RFORK(RFNAMEG|RFNOTEG) < 0){
_syserrno();
return -1;
}
_sessleader = 1;
return getpgrp();
}
pid_t
fork(void)
{
int n;
n = _RFORK(RFENVG|RFFDG|RFPROC);
if(n < 0)
_syserrno();
if(n == 0) {
_detachbuf();
_sessleader = 0;
}
return n;
}
int
execve(const char *name, const char *argv[], const char *envp[])
{
int n, f, i;
char **e, *ss, *se;
Fdinfo *fi;
unsigned long flags;
char nam[256+5];
char buf[1000];
_RFORK(RFCENVG);
/*
* To pass _fdinfo[] across exec, put lines like
* fd flags oflags
* in $_fdinfo (for open fd's)
*/
f = _CREATE("#e/_fdinfo", OWRITE, 0666);
ss = buf;
for(n = 0; n<OPEN_MAX; n++){
fi = &_fdinfo[n];
flags = fi->flags;
if(flags&FD_CLOEXEC){
_CLOSE(n);
fi->flags = 0;
fi->oflags = 0;
}else if(flags&FD_ISOPEN){
ss = _ultoa(ss, n);
*ss++ = ' ';
ss = _ultoa(ss, flags);
*ss++ = ' ';
ss = _ultoa(ss, fi->oflags);
*ss++ = '\n';
if(ss-buf < sizeof(buf)-50){
_WRITE(f, buf, ss-buf);
ss = buf;
}
}
}
if(ss > buf)
_WRITE(f, buf, ss-buf);
_CLOSE(f);
/*
* To pass _sighdlr[] across exec, set $_sighdlr
* to list of blank separated fd's that have
* SIG_IGN (the rest will be SIG_DFL).
* We write the variable, even if no signals
* are ignored, in case the current value of the
* variable ignored some.
*/
f = _CREATE("#e/_sighdlr", OWRITE, 0666);
if(f >= 0){
ss = buf;
for(i = 0; i <=MAXSIG && ss < &buf[sizeof(buf)]-5; i++) {
if(_sighdlr[i] == SIG_IGN) {
ss = _ultoa(ss, i);
*ss++ = ' ';
}
}
_WRITE(f, buf, ss-buf);
_CLOSE(f);
}
if(envp){
strcpy(nam, "#e/");
for(e = (char **)envp; (ss = *e); e++) {
se = strchr(ss, '=');
if(!se || ss==se)
continue; /* what is name? value? */
n = se-ss;
if(n >= sizeof(nam)-3)
n = sizeof(nam)-3-1;
memcpy(nam+3, ss, n);
nam[3+n] = 0;
f = _CREATE(nam, OWRITE, 0666);
if(f < 0)
continue;
se++; /* past = */
n = strlen(se);
/* temporarily decode nulls (see _envsetup()) */
for(i=0; i < n; i++)
if(se[i] == 1)
se[i] = 0;
_WRITE(f, se, n);
/* put nulls back */
for(i=0; i < n; i++)
if(se[i] == 0)
se[i] = 1;
_CLOSE(f);
}
}
n = _EXEC(name, argv);
_syserrno();
return n;
}
/*
* replace the fd with a pipe and start a process to
* accept calls in. this is all to make select work.
*/
static int
listenproc(Rock *r, int fd)
{
Rock *nr;
char *net;
int cfd, nfd, dfd;
int pfd[2];
struct stat d;
char *p;
char listen[Ctlsize];
char name[Ctlsize];
switch(r->stype){
case SOCK_DGRAM:
net = "udp";
break;
case SOCK_STREAM:
net = "tcp";
break;
default:
net = "gok";
break;
}
strcpy(listen, r->ctl);
p = strrchr(listen, '/');
if(p == 0)
return -1;
strcpy(p+1, "listen");
if(pipe(pfd) < 0)
return -1;
/* replace fd with a pipe */
nfd = dup(fd);
dup2(pfd[0], fd);
close(pfd[0]);
fstat(fd, &d);
r->inode = d.st_ino;
r->dev = d.st_dev;
/* start listening process */
switch(fork()){
case -1:
close(pfd[1]);
close(nfd);
return -1;
case 0:
if(_muxsid == -1) {
_RFORK(RFNOTEG);
_muxsid = getpgrp();
} else
setpgid(getpid(), _muxsid);
_RENDEZVOUS(2, _muxsid);
break;
default:
atexit(_killmuxsid);
_muxsid = _RENDEZVOUS(2, 0);
close(pfd[1]);
close(nfd);
return 0;
}
/* for(fd = 0; fd < 30; fd++)
if(fd != nfd && fd != pfd[1])
close(fd);/**/
for(;;){
cfd = open(listen, O_RDWR);
if(cfd < 0)
break;
dfd = _sock_data(cfd, net, r->domain, r->stype, r->protocol, &nr);
if(dfd < 0)
break;
if(write(pfd[1], nr->ctl, strlen(nr->ctl)) < 0)
break;
if(read(pfd[1], name, sizeof(name)) <= 0)
break;
close(dfd);
}
exit(0);
return 0;
}
int
execve(const char *name, const char *argv[], const char *envp[])
{
int n, f, i;
char **e, *ss, *se;
Fdinfo *fi;
unsigned long flags;
char buf[1024];
_RFORK(RFCENVG);
/*
* To pass _fdinfo[] across exec, put lines like
* fd flags oflags
* in $_fdinfo (for open fd's)
*/
f = _CREATE("/env/_fdinfo", OWRITE, 0666);
ss = buf;
for(i = 0; i<OPEN_MAX; i++){
if(i == f)
continue;
fi = &_fdinfo[i];
flags = fi->flags;
if(flags&FD_CLOEXEC){
_CLOSE(i);
fi->flags = 0;
fi->oflags = 0;
}else if(flags&FD_ISOPEN){
if(f < 0)
continue;
ss = _ultoa(ss, i);
*ss++ = ' ';
ss = _ultoa(ss, flags);
*ss++ = ' ';
ss = _ultoa(ss, fi->oflags);
*ss++ = '\n';
n = ss-buf;
if(n > sizeof(buf)-50){
if(_WRITE(f, buf, n) != n)
break;
ss = buf;
}
}
}
if(f >= 0){
if(ss > buf)
_WRITE(f, buf, ss-buf);
_CLOSE(f);
}
/*
* To pass _sighdlr[] across exec, set $_sighdlr
* to list of blank separated fd's that have
* SIG_IGN (the rest will be SIG_DFL).
* We write the variable, even if no signals
* are ignored, in case the current value of the
* variable ignored some.
*/
f = _CREATE("/env/_sighdlr", OWRITE, 0666);
if(f >= 0){
ss = buf;
for(i = 0; i <=MAXSIG; i++) {
if(_sighdlr[i] == SIG_IGN) {
ss = _ultoa(ss, i);
*ss++ = ' ';
n = ss-buf;
if(n > sizeof(buf)-20){
if(_WRITE(f, buf, n) != n)
break;
ss = buf;
}
}
}
if(ss > buf)
_WRITE(f, buf, ss-buf);
_CLOSE(f);
}
if(envp){
for(e = envp; (ss = *e); e++) {
se = strchr(ss, '=');
if(!se || ss==se)
continue; /* what is name? value? */
n = se-ss;
if(n >= sizeof(buf)-5)
continue; /* name too long */
strcpy(buf, "/env/");
memcpy(buf+5, ss, n);
buf[5+n] = 0;
f = _CREATE(buf, OWRITE, 0666);
if(f < 0)
continue;
ss = ++se; /* past = */
se += strlen(ss);
while((n = (se - ss)) > 0){
if(n > sizeof(buf))
n = sizeof(buf);
/* decode nulls (see _envsetup()) */
for(i=0; i<n; i++)
if((buf[i] = ss[i]) == 1)
buf[i] = 0;
if(_WRITE(f, buf, n) != n)
break;
ss += n;
}
_CLOSE(f);
}
}
n = _EXEC(name, argv);
_syserrno();
return n;
}
