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file: redo locking

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Matheus
2023-07-03 22:51:53 -03:00
parent b657874c4c
commit 032560bda0
11 changed files with 107 additions and 27 deletions
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kernel-src/sys/syscalls/seek.c
+10 -6
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@@ -30,21 +30,24 @@ syscallret_t syscall_seek(context_t *context, int fd, off_t offset, int whence)
// TODO device check seek
uintmax_t curroffset = file->offset;
uintmax_t newoffset = 0;
switch (whence) {
case SEEK_SET:
file->offset = offset;
newoffset = offset;
break;
case SEEK_CUR: {
uintmax_t newoffset = file->offset + offset;
if (offset > 0 && newoffset < file->offset) {
uintmax_t newoffset = curroffset + offset;
if (offset > 0 && newoffset < curroffset) {
ret.errno = EOVERFLOW;
goto cleanup;
}
if (offset < 0 && newoffset > file->offset) {
if (offset < 0 && newoffset > curroffset) {
ret.errno = EINVAL;
goto cleanup;
}
file->offset = newoffset;
newoffset = newoffset;
break;
}
case SEEK_END: {
@@ -52,11 +55,12 @@ syscallret_t syscall_seek(context_t *context, int fd, off_t offset, int whence)
ret.errno = VOP_GETATTR(file->vnode, &attr, &_cpu()->thread->proc->cred);
if (ret.errno)
goto cleanup;
file->offset = attr.size;
newoffset = attr.size;
break;
}
}
file->offset = newoffset;
ret.ret = file->offset;
ret.errno = 0;