int
sys_write(struct file *f, char *p, int n)
{
if(argfd(0, 0, &f) < 0 || argint(2, &n) < 0 || argptr(1, &p, n) < 0)
return -1;
return filewrite(f, p, n);
}
int
sys_fstat(struct file *f, struct stat *st)
{
if(argfd(0, 0, &f) < 0 || argptr(1, (void*)&st, sizeof(*st)) < 0)
return -1;
return filestat(f, st);
}
long
sys_write(SyscallFrame *f)
{
int fd;
long l;
uintptr buf;
usize nbytes;
File *file;
// fd
if (argfd(f, 0, &fd) < 0)
return -1;
// nbytes (needed for argptr)
if (arglong(f, 2, &l) < 0) {
// todo errstr
return -1;
}
nbytes = (usize)l;
// buf
if (argptr(f, 1, &buf, nbytes) < 0) {
// todo errstr
return -1;
}
file = proc->files[fd];
if (!(file->omode &(OWRITE | ORDWR))) {
// todo errstr
return -1;
}
return file->write(file, (char *)buf, nbytes);
}
int
sys_close(int fd)
{
struct file *f;
if(argfd(0, &fd, &f) < 0)
return -1;
proc->ofile[fd] = 0;
fileclose(f);
return 0;
}
int
sys_dup(struct file *f)
{
int fd;
if(argfd(0, 0, &f) < 0)
return -1;
if((fd=fdalloc(f)) < 0)
return -1;
filedup(f);
return fd;
}
int
sys_lseek(int fd, int offset, int base)
{
struct file *f;
if(argfd(0, &fd, &f) < 0 || argint(1, &offset) < 0 || argint(2, &base) < 0)
return -1;
if(base == SEEK_SET) {
f->off = offset;
}
if (base == SEEK_CUR)
f->off += offset;
return 0;
}
long
sys_close(SyscallFrame *f)
{
int fd;
File *file;
if (argfd(f, 0, &fd)) {
// todo errstr
return -1;
}
file = proc->files[fd];
releasefile(file);
proc->files[fd] = nil;
return 0;
}
