244 lines
5.4 KiB
C++
244 lines
5.4 KiB
C++
#include "master.hpp"
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namespace factor {
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/* Simple wrappers for ANSI C I/O functions, used for bootstrapping.
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Note the ugly loop logic in almost every function; we have to handle EINTR
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and restart the operation if the system call was interrupted. Naive
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applications don't do this, but then they quickly fail if one enables
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itimer()s or other signals.
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The Factor library provides platform-specific code for Unix and Windows
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with many more capabilities so these words are not usually used in
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normal operation. */
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void factor_vm::init_c_io() {
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special_objects[OBJ_STDIN] = allot_alien(false_object, (cell) stdin);
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special_objects[OBJ_STDOUT] = allot_alien(false_object, (cell) stdout);
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special_objects[OBJ_STDERR] = allot_alien(false_object, (cell) stderr);
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}
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void factor_vm::io_error() {
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if (errno == EINTR)
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return;
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general_error(ERROR_IO, tag_fixnum(errno), false_object);
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}
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FILE* factor_vm::safe_fopen(char* filename, char* mode) {
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FILE* file;
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for (;;) {
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file = fopen(filename, mode);
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if (file == NULL)
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io_error();
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else
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break;
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}
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return file;
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}
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int factor_vm::safe_fgetc(FILE* stream) {
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int c;
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for (;;) {
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c = getc(stream);
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if (c == EOF) {
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if (feof(stream))
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return EOF;
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else
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io_error();
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} else
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break;
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}
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return c;
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}
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size_t factor_vm::safe_fread(void* ptr, size_t size, size_t nitems,
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FILE* stream) {
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size_t items_read = 0;
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size_t ret = 0;
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do {
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ret = fread((void*)((int*)ptr + items_read * size), size,
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nitems - items_read, stream);
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if (ret == 0) {
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if (feof(stream))
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break;
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else
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io_error();
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}
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items_read += ret;
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} while (items_read != nitems);
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return items_read;
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}
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void factor_vm::safe_fputc(int c, FILE* stream) {
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for (;;) {
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if (putc(c, stream) == EOF)
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io_error();
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else
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break;
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}
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}
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size_t factor_vm::safe_fwrite(void* ptr, size_t size, size_t nitems,
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FILE* stream) {
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size_t items_written = 0;
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size_t ret = 0;
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do {
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ret = fwrite((void*)((int*)ptr + items_written * size), size,
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nitems - items_written, stream);
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if (ret == 0)
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io_error();
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items_written += ret;
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} while (items_written != nitems);
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return items_written;
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}
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int factor_vm::safe_ftell(FILE* stream) {
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off_t offset;
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for (;;) {
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if ((offset = FTELL(stream)) == -1)
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io_error();
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else
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break;
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}
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return offset;
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}
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void factor_vm::safe_fseek(FILE* stream, off_t offset, int whence) {
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switch (whence) {
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case 0:
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whence = SEEK_SET;
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break;
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case 1:
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whence = SEEK_CUR;
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break;
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case 2:
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whence = SEEK_END;
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break;
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default:
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critical_error("Bad value for whence", whence);
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}
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for (;;) {
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if (FSEEK(stream, offset, whence) == -1)
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io_error();
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else
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break;
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}
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}
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void factor_vm::safe_fflush(FILE* stream) {
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for (;;) {
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if (fflush(stream) == EOF)
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io_error();
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else
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break;
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}
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}
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void factor_vm::safe_fclose(FILE* stream) {
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for (;;) {
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if (fclose(stream) == EOF)
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io_error();
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else
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break;
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}
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}
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void factor_vm::primitive_fopen() {
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data_root<byte_array> mode(ctx->pop(), this);
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data_root<byte_array> path(ctx->pop(), this);
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mode.untag_check(this);
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path.untag_check(this);
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FILE* file;
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file = safe_fopen((char*)(path.untagged() + 1), (char*)(mode.untagged() + 1));
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ctx->push(allot_alien(file));
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}
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FILE* factor_vm::pop_file_handle() { return (FILE*)alien_offset(ctx->pop()); }
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FILE* factor_vm::peek_file_handle() { return (FILE*)alien_offset(ctx->peek()); }
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void factor_vm::primitive_fgetc() {
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FILE* file = peek_file_handle();
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int c = safe_fgetc(file);
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if (c == EOF && feof(file)) {
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clearerr(file);
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ctx->replace(false_object);
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} else
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ctx->replace(tag_fixnum(c));
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}
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/* Allocates memory */
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void factor_vm::primitive_fread() {
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FILE* file = pop_file_handle();
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void* buf = (void*)alien_offset(ctx->pop());
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fixnum size = unbox_array_size();
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if (size == 0) {
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ctx->push(from_unsigned_cell(0));
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return;
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}
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size_t c = safe_fread(buf, 1, size, file);
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if (c == 0 || feof(file))
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clearerr(file);
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ctx->push(from_unsigned_cell(c));
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}
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void factor_vm::primitive_fputc() {
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FILE* file = pop_file_handle();
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fixnum ch = to_fixnum(ctx->pop());
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safe_fputc((int) ch, file);
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}
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void factor_vm::primitive_fwrite() {
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FILE* file = pop_file_handle();
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cell length = to_cell(ctx->pop());
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char* text = alien_offset(ctx->pop());
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if (length == 0)
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return;
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size_t written = safe_fwrite(text, 1, length, file);
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if (written != length)
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io_error();
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}
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void factor_vm::primitive_ftell() {
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FILE* file = peek_file_handle();
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ctx->replace(from_signed_8(safe_ftell(file)));
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}
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void factor_vm::primitive_fseek() {
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FILE* file = pop_file_handle();
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int whence = (int) to_fixnum(ctx->pop());
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off_t offset = (off_t) to_signed_8(ctx->pop());
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safe_fseek(file, offset, whence);
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}
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void factor_vm::primitive_fflush() {
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FILE* file = pop_file_handle();
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safe_fflush(file);
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}
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void factor_vm::primitive_fclose() {
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FILE* file = pop_file_handle();
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safe_fclose(file);
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}
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/* This function is used by FFI I/O. Accessing the errno global directly is
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not portable, since on some libc's errno is not a global but a funky macro that
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reads thread-local storage. */
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VM_C_API int err_no() { return errno; }
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VM_C_API void set_err_no(int err) { errno = err; }
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}
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