pid_t vfork() {
// Get libc syscall function pointer & offset in image
libc_func(vfork, pid_t);
if (plr_checkInsidePLR()) {
// If already inside PLR code, just call original syscall & return
return _vfork();
} else {
plr_setInsidePLR();
plrlog(LOG_ERROR, "[%d:vfork] ERROR: Target application called vfork(), not supported by PLR\n", getpid());
exit(1);
plr_clearInsidePLR();
return 0;
}
}
extern int system(const char *string)
{
int pid;
void (*s2)(int);
void (*s3)(int);
if ((pid = _vfork()) == 0) {
char *gv[4] = {"sh", "-c", (char*)0, (char*)0};
gv[2] = (char *)string;
_syscall3(SYS_execve, (int)"/bin/sh", (int)gv, (int)_environ);
_syscall1(SYS_exit,127); /* Should not get here!! */
}
s2 = signal(SIGINT, SIG_IGN);
s3 = signal(SIGQUIT, SIG_IGN);
while (1) {
int status;
int wp = _wait(&status);
if (wp == pid || wp == -1) {
signal(SIGINT,s2);
signal(SIGQUIT,s3);
return (wp == -1 ? -1 : status);
}
}
}
