source: mainline/uspace/lib/c/generic/libc.c@ e43acd3

/*
 * Copyright (c) 2005 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libc
 * @{
 */

/** @file
 */

#include <errno.h>
#include <libc.h>
#include <stdbool.h>
#include <stdlib.h>
#include <tls.h>
#include <fibril.h>
#include <fibril_synch.h>
#include <task.h>
#include <loader/pcb.h>
#include <vfs/vfs.h>
#include <vfs/inbox.h>
#include <io/kio.h>
#include "private/libc.h"
#include "private/async.h"
#include "private/malloc.h"
#include "private/io.h"
#include "private/fibril.h"

#ifdef CONFIG_RTLD
#include <rtld/rtld.h>
#endif

progsymbols_t __progsymbols;

static bool env_setup;
static fibril_t main_fibril;

void __libc_main(void *pcb_ptr)
{
        __kio_init();

        assert(!__tcb_is_set());

        __pcb = (pcb_t *) pcb_ptr;

        if (__pcb) {
                main_fibril.tcb = __pcb->tcb;
        } else {
                /*
                 * Loaded by kernel, not the loader.
                 * Kernel only supports loading fully static binaries,
                 * so we can do basic initialization without worrying about
                 * dynamic libraries.
                 */

                main_fibril.tcb = tls_make_initial(__progsymbols.elfstart);
        }

        assert(main_fibril.tcb);

        __fibrils_init();
        __fibril_synch_init();

        /* Initialize the fibril. */
        main_fibril.tcb->fibril_data = &main_fibril;
        __tcb_set(main_fibril.tcb);
        fibril_setup(&main_fibril);

        /* Initialize user task run-time environment */
        __malloc_init();

#ifdef CONFIG_RTLD
        if (__pcb == NULL) {
                /*
                 * A binary loaded by kernel, not the loader.
                 * Noop - code loaded by kernel doesn't need RTLD.
                 */
        } else {
                assert(__pcb->rtld_runtime != NULL);
                runtime_env = (rtld_t *) __pcb->rtld_runtime;
        }
#endif

        __async_server_init();
        __async_client_init();
        __async_ports_init();

        /* The basic run-time environment is setup */
        env_setup = true;

        int argc;
        char **argv;

        /*
         * Get command line arguments and initialize
         * standard input and output
         */
        if (__pcb == NULL) {
                argc = 0;
                argv = NULL;
                __stdio_init();
        } else {
                argc = __pcb->argc;
                argv = __pcb->argv;
                __inbox_init(__pcb->inbox, __pcb->inbox_entries);
                __stdio_init();
                vfs_root_set(inbox_get("root"));
                (void) vfs_cwd_set(__pcb->cwd);
        }

        /*
         * C++ Static constructor calls.
         */

        if (__progsymbols.preinit_array) {
                for (int i = __progsymbols.preinit_array_len - 1; i >= 0; --i)
                        __progsymbols.preinit_array[i]();
        }

        if (__progsymbols.init_array) {
                for (int i = __progsymbols.init_array_len - 1; i >= 0; --i)
                        __progsymbols.init_array[i]();
        }

        /*
         * Run main() and set task return value
         * according the result
         */
        int retval = __progsymbols.main(argc, argv);
        exit(retval);
}

void __libc_fini(void)
{
        __async_client_fini();
        __async_server_fini();
        __async_ports_fini();

        __fibril_synch_fini();
        __fibrils_fini();

        __malloc_fini();

        __kio_fini();
}

void __libc_exit(int status)
{
        /*
         * GCC extension __attribute__((destructor)),
         * C++ destructors are added to __cxa_finalize call
         * when the respective constructor is called.
         */

        for (int i = 0; i < __progsymbols.fini_array_len; ++i)
                __progsymbols.fini_array[i]();

        if (env_setup) {
                __stdio_done();
                task_retval(status);
        }

        __SYSCALL1(SYS_TASK_EXIT, false);
        __builtin_unreachable();
}

void __libc_abort(void)
{
        __SYSCALL1(SYS_TASK_EXIT, true);
        __builtin_unreachable();
}

/** @}
 */