Stub out poll() syscall and LibC wrapper.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/2bedabbd6ce

Kernel/.gitignore

@@ -4,3 +4,4 @@ Boot/boot.bin
 kernel
 kernel.map
 _fs_contents
+sync-local.sh

Kernel/Process.cpp

@@ -2002,6 +2002,13 @@ int Process::sys$select(const Syscall::SC_select_params* params)
     return markedfds;
 }
 
+int Process::sys$poll(pollfd* fds, int nfds, int timeout)
+{
+    if (!validate_read_typed(fds))
+        return -EFAULT;
+    return 0;
+}
+
 Inode* Process::cwd_inode()
 {
     // FIXME: This is retarded factoring.

Kernel/Process.h

@@ -157,6 +157,7 @@ public:
     int sys$munmap(void*, size_t size);
     int sys$set_mmap_name(void*, size_t, const char*);
     int sys$select(const Syscall::SC_select_params*);
+    int sys$poll(pollfd*, int nfds, int timeout);
     ssize_t sys$get_dir_entries(int fd, void*, size_t);
     int sys$getcwd(char*, size_t);
     int sys$chdir(const char*);

Kernel/Syscall.cpp

@@ -100,6 +100,8 @@ static dword handle(RegisterDump& regs, dword function, dword arg1, dword arg2,
         return (dword)current->sys$mmap((const SC_mmap_params*)arg1);
     case Syscall::SC_select:
         return current->sys$select((const SC_select_params*)arg1);
+    case Syscall::SC_poll:
+        return current->sys$poll((pollfd*)arg1, (int)arg2, (int)arg3);
     case Syscall::SC_munmap:
         return current->sys$munmap((void*)arg1, (size_t)arg2);
     case Syscall::SC_gethostname:

Kernel/Syscall.h

@@ -75,6 +75,7 @@
     __ENUMERATE_SYSCALL(gui_get_window_parameters) \
     __ENUMERATE_SYSCALL(gui_set_window_parameters) \
     __ENUMERATE_SYSCALL(unlink) \
+    __ENUMERATE_SYSCALL(poll) \
 
 
 struct fd_set;

Kernel/UnixTypes.h

@@ -291,3 +291,16 @@ struct stat {
     time_t    st_mtime;   /* time of last modification */
     time_t    st_ctime;   /* time of last status change */
 };
+
+#define POLLIN   (1u << 0)
+#define POLLPRI  (1u << 2)
+#define POLLOUT  (1u << 3)
+#define POLLERR  (1u << 4)
+#define POLLHUP  (1u << 5)
+#define POLLNVAL (1u << 6)
+
+struct pollfd {
+    int   fd;
+    short events;
+    short revents;
+};

Kernel/sync-local.sh

@@ -1,10 +0,0 @@
-cp ../../figlet-2.2.5/figlet mnt/bin/
-mkdir -p mnt/usr/local/share/figlet
-FIGLET_FONTDIR=/
-cp ../../figlet-2.2.5/fonts/standard.flf mnt/$FIGLET_FONTDIR
-cp ../../figlet-2.2.5/fonts/big.flf mnt/$FIGLET_FONTDIR
-cp ../../figlet-2.2.5/fonts/slant.flf mnt/$FIGLET_FONTDIR
-cp ../../figlet-2.2.5/fonts/lean.flf mnt/$FIGLET_FONTDIR
-
-cp ../../bash-2.05b/bash mnt/bin/bash
-

LibC/Makefile

@@ -43,6 +43,7 @@ LIBC_OBJS = \
        utime.o \
        gui.o \
        sys/select.o \
+       poll.o \
        entry.o
 
 OBJS = $(AK_OBJS) $(WIDGETS_OBJS) $(LIBC_OBJS) $(SHAREDGRAPHICS_OBJS)

LibC/poll.cpp

@@ -0,0 +1,14 @@
+#include <poll.h>
+#include <Kernel/Syscall.h>
+#include <errno.h>
+
+extern "C" {
+
+int poll(struct pollfd* fds, int nfds, int timeout)
+{
+    int rc = syscall(SC_poll, fds, nfds, timeout);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+}
+

LibC/poll.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define POLLIN   (1u << 0)
+#define POLLPRI  (1u << 2)
+#define POLLOUT  (1u << 3)
+#define POLLERR  (1u << 4)
+#define POLLHUP  (1u << 5)
+#define POLLNVAL (1u << 6)
+
+struct pollfd {
+    int   fd;
+    short events;
+    short revents;
+};
+
+int poll(struct pollfd* fds, int nfds, int timeout);
+
+__END_DECLS
+