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Initialize stdin, stdout and stderr at compile time.

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-08-04 00:24:30 +02:00
parent 8570f46734
commit a25f1a931e
4 changed files with 86 additions and 32 deletions
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2
libc/include/FILE.h
View file

@ -67,6 +67,8 @@ typedef struct FILE FILE;
#define _FILE_MAX_PUSHBACK 8
/* Note stdio/stdio.cpp's declarations of stdin/stdout/stderr also needs to be
changed if you make changes to this structure. */
struct FILE
{
/* This is non-standard, but useful. If you allocate your own FILE and

5
libc/init/init.cpp
View file

@ -30,8 +30,6 @@
extern "C" { char* program_invocation_name; }
extern "C" { char* program_invocation_short_name; }
extern "C" void init_stdio();
static char* find_last_elem(char* str)
{
size_t len = strlen(str);
@ -49,7 +47,4 @@ extern "C" void initialize_standard_library(int argc, char* argv[])
// Initialize pthreads.
pthread_initialize();
// Initialize stdio.
init_stdio();
}

107
libc/stdio/stdio.cpp
View file

@ -23,6 +23,7 @@
*******************************************************************************/
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
@ -32,35 +33,89 @@ static struct fdio_state stdin_fdio = { NULL, 0 };
static struct fdio_state stdout_fdio = { NULL, 1 };
static struct fdio_state stderr_fdio = { NULL, 2 };
static FILE stdin_file;
static FILE stdout_file;
static FILE stderr_file;
extern "C" {
extern "C" { FILE* stdin = &stdin_file; }
extern "C" { FILE* stdout = &stdout_file; }
extern "C" { FILE* stderr = &stderr_file; }
extern FILE __stdin_file;
extern FILE __stdout_file;
extern FILE __stderr_file;
static void bootstrap_stdio(FILE* fp, struct fdio_state* fdio, int file_flags)
FILE __stdin_file =
{
fresetfile(fp);
/* buffersize = */ 0,
/* buffer = */ NULL,
/* user = */ &stdin_fdio,
/* free_user = */ NULL,
/* reopen_func = */ fdio_reopen,
/* read_func = */ fdio_read,
/* write_func = */ fdio_write,
/* seek_func = */ fdio_seek,
/* fileno_func = */ fdio_fileno,
/* close_func = */ fdio_close,
/* free_func = */ NULL,
/* file_lock = */ PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP,
/* fflush_indirect = */ NULL,
/* buffer_free_indirect = */ NULL,
/* prev = */ NULL,
/* next = */ &__stdout_file,
/* flags = */ _FILE_REGISTERED | _FILE_READABLE,
/* buffer_mode = */ -1,
/* offset_input_buffer = */ 0,
/* amount_input_buffered = */ 0,
/* amount_output_buffered = */ 0,
};
fp->flags |= file_flags;
fp->user = fdio;
fp->reopen_func = fdio_reopen;
fp->read_func = fdio_read;
fp->write_func = fdio_write;
fp->seek_func = fdio_seek;
fp->fileno_func = fdio_fileno;
fp->close_func = fdio_close;
fregister(fp);
}
extern "C" void init_stdio()
FILE __stdout_file
{
bootstrap_stdio(stdin, &stdin_fdio, _FILE_READABLE);
bootstrap_stdio(stdout, &stdout_fdio, _FILE_WRITABLE);
bootstrap_stdio(stderr, &stderr_fdio, _FILE_WRITABLE);
/* buffersize = */ 0,
/* buffer = */ NULL,
/* user = */ &stdout_fdio,
/* free_user = */ NULL,
/* reopen_func = */ fdio_reopen,
/* read_func = */ fdio_read,
/* write_func = */ fdio_write,
/* seek_func = */ fdio_seek,
/* fileno_func = */ fdio_fileno,
/* close_func = */ fdio_close,
/* free_func = */ NULL,
/* file_lock = */ PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP,
/* fflush_indirect = */ NULL,
/* buffer_free_indirect = */ NULL,
/* prev = */ &__stdin_file,
/* next = */ &__stderr_file,
/* flags = */ _FILE_REGISTERED | _FILE_WRITABLE,
/* buffer_mode = */ -1,
/* offset_input_buffer = */ 0,
/* amount_input_buffered = */ 0,
/* amount_output_buffered = */ 0,
};
stderr->buffer_mode = _IONBF;
}
FILE __stderr_file
{
/* buffersize = */ 0,
/* buffer = */ NULL,
/* user = */ &stderr_fdio,
/* free_user = */ NULL,
/* reopen_func = */ fdio_reopen,
/* read_func = */ fdio_read,
/* write_func = */ fdio_write,
/* seek_func = */ fdio_seek,
/* fileno_func = */ fdio_fileno,
/* close_func = */ fdio_close,
/* free_func = */ NULL,
/* file_lock = */ PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP,
/* fflush_indirect = */ NULL,
/* buffer_free_indirect = */ NULL,
/* prev = */ &__stdout_file,
/* next = */ NULL,
/* flags = */ _FILE_REGISTERED | _FILE_WRITABLE,
/* buffer_mode = */ _IONBF,
/* offset_input_buffer = */ 0,
/* amount_input_buffered = */ 0,
/* amount_output_buffered = */ 0,
};
FILE* stdin = &__stdin_file;
FILE* stdout = &__stdout_file;
FILE* stderr = &__stderr_file;
} // extern "C"

4
libc/stdlib/exit.cpp
View file

@ -35,9 +35,11 @@ extern "C" { struct exit_handler* __exit_handler_stack = NULL; }
static pthread_mutex_t exit_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
static bool currently_exiting = false;
extern "C" FILE __stdin_file;
extern "C" { DIR* __first_dir = NULL; }
extern "C" { pthread_mutex_t __first_dir_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; }
extern "C" { FILE* __first_file = NULL; }
extern "C" { FILE* __first_file = &__stdin_file; }
extern "C" { pthread_mutex_t __first_file_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; }
extern "C" void exit(int status)