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#include "lib.h"
#include <unistd.h>
#include <errno.h>
#include <stdarg.h>
#include "sys9.h"
/*
* BUG: advisory locking not implemented
*/
#define OFL (O_ACCMODE|O_NONBLOCK|O_APPEND)
int
fcntl(int fd, int cmd, ...)
{
int arg, i, ans, err;
Fdinfo *fi, *fans;
va_list va;
unsigned long oflags;
err = 0;
ans = 0;
va_start(va, cmd);
arg = va_arg(va, int);
va_end(va);
fi = &_fdinfo[fd];
if(fd<0 || fd>=OPEN_MAX || !(fi->flags&FD_ISOPEN))
err = EBADF;
else switch(cmd){
case F_DUPFD:
if(fi->flags&(FD_BUFFERED|FD_BUFFEREDX)){
err = EGREG; /* dup of buffered fd not implemented */
break;
}
oflags = fi->oflags;
for(i = (arg>0)? arg : 0; i<OPEN_MAX; i++)
if(!(_fdinfo[i].flags&FD_ISOPEN))
break;
if(i == OPEN_MAX)
err = EMFILE;
else {
ans = _DUP(fd, i);
if(ans != i){
if(ans < 0){
_syserrno();
err = errno;
}else
err = EBADF;
}else{
fans = &_fdinfo[ans];
fans->flags = fi->flags&~FD_CLOEXEC;
fans->oflags = oflags;
fans->uid = fi->uid;
fans->gid = fi->gid;
}
}
break;
case F_GETFD:
ans = fi->flags&FD_CLOEXEC;
break;
case F_SETFD:
fi->flags = (fi->flags&~FD_CLOEXEC)|(arg&FD_CLOEXEC);
break;
case F_GETFL:
ans = fi->oflags&OFL;
break;
case F_SETFL:
fi->oflags = (fi->oflags&~OFL)|(arg&OFL);
break;
case F_GETLK:
case F_SETLK:
case F_SETLKW:
err = EINVAL;
break;
}
if(err){
errno = err;
ans = -1;
}
return ans;
}
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