major restructuring, prepare for smp

code/user/personalities/posix/posix_fd.c

@@ -0,0 +1,67 @@
+// posix_fd.c - file descriptor table
+#include <ntlite/syscall.h>
+#include "posix.h"
+#include "posix_fd.h"
+
+int errno = 0;
+
+int PosixStatusToErrno(uint32_t s) {
+    switch (s) {
+        case 0x0000: return 0;       // STATUS_SUCCESS
+        case 0x0002: return ENOSYS;  // STATUS_NOT_SUPPORTED
+        case 0x0003: return EAGAIN;  // STATUS_TIMEOUT / would block
+        case 0x0010: return EINVAL;  // STATUS_INVALID_PARAMETER
+        case 0x0011: return EBADF;   // STATUS_INVALID_HANDLE
+        case 0x0012: return ERANGE;  // STATUS_BUFFER_TOO_SMALL
+        case 0x0020: return ENOMEM;  // STATUS_NO_MEMORY
+        case 0x0021: return EACCES;  // STATUS_ACCESS_DENIED
+        case 0x0022: return ENOENT;  // STATUS_NOT_FOUND
+        case 0x0023: return EEXIST;  // STATUS_ALREADY_EXISTS
+        case 0x0030: return ECONNRESET; // STATUS_OBJECT_DEAD
+        case 0x0031: return EAGAIN;  // STATUS_QUEUE_FULL
+        case 0x0032: return EAGAIN;  // STATUS_QUEUE_EMPTY
+        default:     return EIO;
+    }
+}
+
+static FD_ENTRY gFdTable[FD_TABLE_PIDS][FD_MAX];
+
+__declspec(dllexport) void PosixFdInit(void) {
+    uint32_t pid = SysGetCurrentPid();
+    uint32_t slot = pid % FD_TABLE_PIDS;
+
+    // Clear this process's slice (handles inherited state from a previous
+    // process that happened to land on the same slot - unlikely but safe).
+    for (int i = 0; i < FD_MAX; i++)
+        gFdTable[slot][i] = (FD_ENTRY){ FD_FREE, 0, false };
+
+    gFdTable[slot][0] = (FD_ENTRY){ FD_CONSOLE_R, 0, true };
+    gFdTable[slot][1] = (FD_ENTRY){ FD_CONSOLE_W, 0, true };
+    gFdTable[slot][2] = (FD_ENTRY){ FD_CONSOLE_W, 0, true };
+}
+
+__declspec(dllexport) int FdAlloc(uint32_t pid, FD_TYPE type, uint32_t khandle) {
+    uint32_t slot = pid % FD_TABLE_PIDS;
+    for (int fd = 3; fd < FD_MAX; fd++) {
+        if (!gFdTable[slot][fd].Used) {
+            gFdTable[slot][fd] = (FD_ENTRY){ type, khandle, true };
+            return fd;
+        }
+    }
+    errno = EMFILE;
+    return -1;
+}
+
+__declspec(dllexport) FD_ENTRY* FdGet(uint32_t pid, int fd) {
+    if (fd < 0 || fd >= FD_MAX) { errno = EBADF; return (FD_ENTRY*)0; }
+    uint32_t slot = pid % FD_TABLE_PIDS;
+    FD_ENTRY* e = &gFdTable[slot][fd];
+    if (!e->Used) { errno = EBADF; return (FD_ENTRY*)0; }
+    return e;
+}
+
+__declspec(dllexport) void FdFree(uint32_t pid, int fd) {
+    if (fd < 0 || fd >= FD_MAX) return;
+    uint32_t slot = pid % FD_TABLE_PIDS;
+    gFdTable[slot][fd] = (FD_ENTRY){ FD_FREE, 0, false };
+}