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