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#include "lib.h"
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include "sys9.h"
extern char **environ;
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 = (char**)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;
}
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