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Kernel: Fix cloning file descriptions on fork

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After a fork, the parent and the child are supposed to share
the same file description. For example, modifying the current
offset of a file description is visible in both of them.
This commit is contained in:
Sergey Bugaev 2019-08-11 16:07:47 +03:00 committed by Andreas Kling
parent 2396b2ed70
commit 1606261c58
Notes: sideshowbarker 2024-07-19 12:45:13 +09:00 
Author: https://github.com/bugaevc
Commit: https://github.com/SerenityOS/serenity/commit/1606261c585
Pull-request: https://github.com/SerenityOS/serenity/pull/434
Reviewed-by: https://github.com/awesomekling
3 changed files with 1 additions and 22 deletions
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18
Kernel/FileSystem/FileDescription.cpp
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@ -57,24 +57,6 @@ void FileDescription::set_socket_role(SocketRole role)
socket()->attach(*this);
}
NonnullRefPtr<FileDescription> FileDescription::clone()
{
RefPtr<FileDescription> description;
if (is_fifo()) {
description = fifo()->open_direction(m_fifo_direction);
} else {
description = FileDescription::create(m_file, m_socket_role);
description->m_custody = m_custody;
description->m_inode = m_inode;
}
ASSERT(description);
description->m_current_offset = m_current_offset;
description->m_is_blocking = m_is_blocking;
description->m_should_append = m_should_append;
description->m_file_flags = m_file_flags;
return *description;
}
KResult FileDescription::fstat(stat& buffer)
{
ASSERT(!is_fifo());

2
Kernel/FileSystem/FileDescription.h
View file

@ -26,8 +26,6 @@ public:
static NonnullRefPtr<FileDescription> create(File&, SocketRole = SocketRole::None);
~FileDescription();
NonnullRefPtr<FileDescription> clone();
int close();
off_t seek(off_t, int whence);

3
Kernel/Process.cpp
View file

@ -624,8 +624,7 @@ Process::Process(String&& name, uid_t uid, gid_t gid, pid_t ppid, RingLevel ring
#ifdef FORK_DEBUG
dbgprintf("fork: cloning fd %u... (%p) istty? %u\n", i, fork_parent->m_fds[i].description.ptr(), fork_parent->m_fds[i].description->is_tty());
#endif
m_fds[i].description = fork_parent->m_fds[i].description->clone();
m_fds[i].flags = fork_parent->m_fds[i].flags;
m_fds[i] = fork_parent->m_fds[i];
}
} else {
m_fds.resize(m_max_open_file_descriptors);