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/*
* Manuel Novoa III Feb 2001
*
* __uClibc_main is the routine to be called by all the arch-specific
* versions of crt0.S in uClibc.
*
* It is meant to handle any special initialization needed by the library
* such as setting the global variable(s) __environ (environ) and
* initializing the stdio package. Using weak symbols, the latter is
* avoided in the static library case.
*/
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
/*
* Prototypes.
*/
extern int main(int argc, char **argv, char **envp);
void __uClibc_main(int argc, char **argv, char **envp)
__attribute__ ((__noreturn__));
#ifdef HAVE_ELF
weak_alias(__environ, environ);
extern void weak_function __init_stdio(void);
extern void weak_function __stdio_close_all(void);
extern void weak_function __pthread_initialize_minimal (void);
#else
extern void __init_stdio(void);
extern void __stdio_close_all(void);
extern void __pthread_initialize_minimal (void);
#endif
typedef void (*vfuncp) (void);
vfuncp __uClibc_cleanup = __stdio_close_all;
/*
* Now for our main routine.
*/
void __uClibc_main(int argc, char **argv, char **envp)
{
/*
* Initialize the global variable __environ.
*/
__environ = envp;
/* Initialize the thread library at least a bit so at least
* errno will be properly setup */
if (__pthread_initialize_minimal)
__pthread_initialize_minimal ();
#if 0
/* Some security at this point. Prevent starting a SUID binary
* where the standard file descriptors are not opened. We have
* to do this only for statically linked applications since
* otherwise the dynamic loader did the work already. */
if (__builtin_expect (__libc_enable_secure, 0))
__libc_check_standard_fds ();
#endif
/*
* Initialize stdio here. In the static library case, this will
* be bypassed if not needed because of the weak alias above.
*/
if (__init_stdio)
__init_stdio();
/*
* Note: It is possible that any initialization done above could
* have resulted in errno being set nonzero, so set it to 0 before
* we call main.
*/
__set_errno(0);
/*
* Finally, invoke application's main and then exit.
*/
exit(main(argc, argv, envp));
}
/*
* Declare the __environ global variable and create a weak alias environ.
* Note: Apparently we must initialize __environ for the weak environ
* symbol to be included.
*/
char **__environ = 0;
#ifndef HAVE_ELF
/*
* Define an empty function and use it as a weak alias for the stdio
* initialization routine. That way we don't pull in all the stdio
* code unless we need to. Similarly, do the same for __stdio_close_all
* so as not to include atexit unnecessarily.
*
* NOTE!!! This is only true for the _static_ case!!!
*/
weak_alias(__environ, environ);
#if 0
void __uClibc_empty_func(void)
{
}
weak_alias(__uClibc_empty_func, __init_stdio);
weak_alias(__uClibc_empty_func, __stdio_close_all);
#endif
#endif
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