253 lines
4.6 KiB
C++
Executable File
253 lines
4.6 KiB
C++
Executable File
#include "master.hpp"
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namespace factor
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{
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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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{
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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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{
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#ifndef WINCE
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if(errno == EINTR)
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return;
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#endif
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general_error(ERROR_IO,tag_fixnum(errno),false_object,NULL);
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}
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size_t safe_fread(void *ptr, size_t size, size_t nitems, FILE *stream)
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{
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size_t items_read = 0;
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do {
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items_read += fread((void*)((int*)ptr+items_read*size),size,nitems-items_read,stream);
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} while(items_read != nitems && errno == EINTR);
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return items_read;
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}
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size_t safe_fwrite(void *ptr, size_t size, size_t nitems, FILE *stream)
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{
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size_t items_written = 0;
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do {
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items_written += fwrite((void*)((int*)ptr+items_written*size),size,nitems-items_written,stream);
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} while(items_written != nitems && errno == EINTR);
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return items_written;
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}
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int safe_fclose(FILE *stream)
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{
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int ret = 0;
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do {
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ret = fclose(stream);
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} while(ret != 0 && errno == EINTR);
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return ret;
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}
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void factor_vm::primitive_fopen()
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{
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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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do {
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file = fopen((char *)(path.untagged() + 1),
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(char *)(mode.untagged() + 1));
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if(file == NULL)
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io_error();
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} while(errno == EINTR);
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ctx->push(allot_alien(file));
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}
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FILE *factor_vm::pop_file_handle()
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{
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return (FILE *)alien_offset(ctx->pop());
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}
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void factor_vm::primitive_fgetc()
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{
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FILE *file = pop_file_handle();
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do {
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int c = fgetc(file);
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if(c == EOF)
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{
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if(feof(file))
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{
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ctx->push(false_object);
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break;
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}
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else
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io_error();
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}
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else
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{
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ctx->push(tag_fixnum(c));
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break;
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}
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} while(errno == EINTR);
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}
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void factor_vm::primitive_fread()
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{
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FILE *file = pop_file_handle();
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fixnum size = unbox_array_size();
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if(size == 0)
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{
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ctx->push(tag<string>(allot_string(0,0)));
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return;
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}
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data_root<byte_array> buf(allot_uninitialized_array<byte_array>(size),this);
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for(;;)
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{
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int c = safe_fread(buf.untagged() + 1,1,size,file);
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if(c == 0)
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{
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if(feof(file))
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{
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ctx->push(false_object);
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break;
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}
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else
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io_error();
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}
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else
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{
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if(feof(file))
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{
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byte_array *new_buf = allot_byte_array(c);
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memcpy(new_buf + 1, buf.untagged() + 1,c);
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buf = new_buf;
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}
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ctx->push(buf.value());
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break;
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}
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}
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}
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void factor_vm::primitive_fputc()
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{
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FILE *file = pop_file_handle();
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fixnum ch = to_fixnum(ctx->pop());
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do {
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if(fputc(ch,file) == EOF)
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io_error();
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else
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break;
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} while(errno == EINTR);
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}
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void factor_vm::primitive_fwrite()
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{
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FILE *file = pop_file_handle();
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byte_array *text = untag_check<byte_array>(ctx->pop());
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cell length = array_capacity(text);
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char *string = (char *)(text + 1);
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if(length == 0)
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return;
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size_t written = safe_fwrite(string,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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{
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FILE *file = pop_file_handle();
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off_t offset;
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do {
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if((offset = FTELL(file)) == -1)
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io_error();
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else
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break;
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} while(errno == EINTR);
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ctx->push(from_signed_8(offset));
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}
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void factor_vm::primitive_fseek()
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{
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int whence = to_fixnum(ctx->pop());
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FILE *file = pop_file_handle();
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off_t offset = to_signed_8(ctx->pop());
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switch(whence)
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{
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case 0: whence = SEEK_SET; break;
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case 1: whence = SEEK_CUR; break;
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case 2: whence = SEEK_END; break;
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default:
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critical_error("Bad value for whence",whence);
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break;
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}
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do {
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if(FSEEK(file,offset,whence) == -1)
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io_error();
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else
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break;
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} while(errno == EINTR);
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}
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void factor_vm::primitive_fflush()
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{
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FILE *file = pop_file_handle();
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do {
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if(fflush(file) == EOF)
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io_error();
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else
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break;
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} while(errno == EINTR);
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}
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void factor_vm::primitive_fclose()
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{
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FILE *file = pop_file_handle();
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if(safe_fclose(file) == EOF)
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io_error();
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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()
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{
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return errno;
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}
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VM_C_API void clear_err_no()
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{
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errno = 0;
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}
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}
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