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Kernel: Add a writev() syscall for writing multiple buffers in one go.

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We then use this immediately in the WindowServer/LibGUI communication in
order to send both message + optional "extra data" with a single syscall.
This commit is contained in:
Andreas Kling 2019-05-10 03:19:25 +02:00
parent e6443649cb
commit 99aead4857
8 changed files with 111 additions and 54 deletions
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2
Kernel/Process.h
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@ -110,6 +110,7 @@ public:
int sys$close(int fd);
ssize_t sys$read(int fd, byte*, ssize_t);
ssize_t sys$write(int fd, const byte*, ssize_t);
ssize_t sys$writev(int fd, const struct iovec* iov, int iov_count);
int sys$fstat(int fd, stat*);
int sys$lstat(const char*, stat*);
int sys$stat(const char*, stat*);
@ -255,6 +256,7 @@ private:
Process(String&& name, uid_t, gid_t, pid_t ppid, RingLevel, RetainPtr<Inode>&& cwd = nullptr, RetainPtr<Inode>&& executable = nullptr, TTY* = nullptr, Process* fork_parent = nullptr);
int do_exec(String path, Vector<String> arguments, Vector<String> environment);
ssize_t do_write(FileDescriptor&, const byte*, int data_size);
int alloc_fd(int first_candidate_fd = 0);
void disown_all_shared_buffers();