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Override fork().

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Ove Kaaven 2000-04-28 14:44:05 +00:00 committed by Alexandre Julliard
parent 7827254cf2
commit 1abdb6f74d
1 changed files with 35 additions and 4 deletions
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39
scheduler/pthread.c
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@ -33,17 +33,32 @@
# define PREFIX
#endif
#define PSTR(str) PREFIX #str
/* adapt as necessary (a construct like this is used in glibc sources) */
#define strong_alias(orig, alias) \
asm(".globl " PREFIX #alias "\n\t.set " PREFIX #alias "," PREFIX #orig)
asm(".globl " PSTR(alias) "\n\t.set " PSTR(alias) "," PSTR(orig))
/* strong_alias does not work on external symbols (.o format limitation?),
* so for those, we need to use the pogo stick */
#ifdef __i386__
#define jump_alias(orig, alias) \
asm(".globl " PREFIX #alias "\n\t" PREFIX #alias ":\n\tjmp " PREFIX #orig)
asm(".globl " PSTR(alias) "\n\t" PSTR(alias) ":\n\tjmp " PSTR(orig))
#endif
/* get necessary libc symbols */
#if (__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 1)
#define LIBC_FORK __libc_fork
#define PTHREAD_FORK __fork
#define ALIAS_FORK
#else
#define LIBC_FORK __fork
#define PTHREAD_FORK fork
#endif
extern pid_t LIBC_FORK(void);
#define LIBC_SIGACTION __sigaction
/* NOTE: This is a truly extremely incredibly ugly hack!
* But it does seem to work... */
@ -102,6 +117,21 @@ int __pthread_atfork(void (*prepare)(void),
}
strong_alias(__pthread_atfork, pthread_atfork);
pid_t PTHREAD_FORK(void)
{
pid_t pid;
/* call prepare handlers */
pid = LIBC_FORK();
if (pid == 0) {
/* call child handlers */
} else {
/* call parent handlers */
}
return pid;
}
#ifdef ALIAS_FORK
strong_alias(PTHREAD_FORK, fork);
#endif
/***** MUTEXES *****/
@ -354,6 +384,7 @@ int pthread_equal(pthread_t thread1, pthread_t thread2)
void pthread_exit(void *retval)
{
/* FIXME: pthread cleanup */
ExitThread((DWORD)retval);
}
@ -367,11 +398,11 @@ int pthread_setcanceltype(int type, int *oldtype)
/* pthreads tries to override these, point them back to libc */
#ifdef jump_alias
jump_alias(__sigaction, sigaction);
jump_alias(LIBC_SIGACTION, sigaction);
#else
int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact)
{
return __sigaction(signum, act, oldact);
return LIBC_SIGACTION(signum, act, oldact);
}
#endif