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;
}
int
rename(const char *from, const char *to)
{
int n;
char *f, *t;
Dir *d, nd;
if(access(to, 0) >= 0){
if(_REMOVE(to) < 0){
_syserrno();
return -1;
}
}
if((d = _dirstat(to)) != nil){
free(d);
errno = EEXIST;
return -1;
}
if((d = _dirstat(from)) == nil){
_syserrno();
return -1;
}
f = strrchr(from, '/');
t = strrchr(to, '/');
f = f? f+1 : (char *)from;
t = t? t+1 : (char *)to;
n = 0;
if(f-from==t-to && strncmp(from, to, f-from)==0){
/* from and to are in same directory (we miss some cases) */
_nulldir(&nd);
nd.name = t;
if(_dirwstat(from, &nd) < 0){
_syserrno();
n = -1;
}
}else{
/* different directories: have to copy */
int ffd, tfd;
char buf[8192];
tfd = -1;
if((ffd = _OPEN(from, 0)) < 0 ||
(tfd = _CREATE(to, 1, d->mode)) < 0){
_CLOSE(ffd);
_syserrno();
n = -1;
}
while(n>=0 && (n = _READ(ffd, buf, 8192)) > 0)
if(_WRITE(tfd, buf, n) != n){
_syserrno();
n = -1;
}
_CLOSE(ffd);
_CLOSE(tfd);
if(n>0)
n = 0;
if(n == 0) {
if(_REMOVE(from) < 0){
_syserrno();
return -1;
}
}
}
free(d);
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 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;
}