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devfs: maxseek

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Matheus
2023-09-09 00:30:43 -03:00
parent a83a561094
commit fe303aec69
4 changed files with 35 additions and 12 deletions
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kernel-src/sys/syscalls/seek.c
+23 -12
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@@ -9,7 +9,8 @@
syscallret_t syscall_seek(context_t *context, int fd, off_t offset, int whence) {
syscallret_t ret = {
.ret = -1
.ret = -1,
.errno = 0
};
if (whence > 2) {
@@ -28,15 +29,30 @@ syscallret_t syscall_seek(context_t *context, int fd, off_t offset, int whence)
goto cleanup;
}
// TODO device check seek
size_t size = -1;
uintmax_t curroffset = file->offset;
uintmax_t newoffset = 0;
// determine size
if (file->vnode->type == V_TYPE_CHDEV) {
ret.errno = VOP_MAXSEEK(file->vnode, &size);
if (ret.errno) {
ret.errno = ESPIPE;
goto cleanup;
}
} else {
vattr_t attr;
ret.errno = VOP_GETATTR(file->vnode, &attr, &_cpu()->thread->proc->cred);
if (ret.errno)
goto cleanup;
size = attr.size;
}
switch (whence) {
case SEEK_SET:
newoffset = offset;
break;
newoffset = offset;
break;
case SEEK_CUR:
newoffset = curroffset + offset;
if (offset > 0 && newoffset < curroffset) {
@@ -48,14 +64,9 @@ syscallret_t syscall_seek(context_t *context, int fd, off_t offset, int whence)
goto cleanup;
}
break;
case SEEK_END: {
vattr_t attr;
ret.errno = VOP_GETATTR(file->vnode, &attr, &_cpu()->thread->proc->cred);
if (ret.errno)
goto cleanup;
newoffset = attr.size;
case SEEK_END:
newoffset = size;
break;
}
}
file->offset = newoffset;