#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <linux/user.h>
#include <sys/syscall.h>
#include <stddef.h>
#include <stdio.h>



char *(syscall_names[256]) = { "dummy",

"exit", "fork", "read", "write", "open", "close", "waitpid", "creat",
"link", "unlink", "execve", "chdir", "time", "mknod", "chmod",
"lchown", "break", "oldstat", "lseek", "getpid", "mount", "umount",
"setuid", "getuid", "stime", "ptrace", "alarm", "oldfstat", "pause",
"utime", "stty", "gtty", "access", "nice", "ftime", "sync", "kill",
"rename", "mkdir", "rmdir", "dup", "pipe", "times", "prof", "brk",
"setgid", "getgid", "signal", "geteuid", "getegid", "acct", "umount2",
"lock", "ioctl", "fcntl", "mpx", "setpgid", "ulimit", "oldolduname",
"umask", "chroot", "ustat", "dup2", "getppid", "getpgrp", "setsid",
"sigaction", "sgetmask", "ssetmask", "setreuid", "setregid",
"sigsuspend", "sigpending", "sethostname", "setrlimit", "getrlimit",
"getrusage", "gettimeofday", "settimeofday", "getgroups", "setgroups",
"select", "symlink", "oldlstat", "readlink", "uselib", "swapon",
"reboot", "readdir", "mmap", "munmap", "truncate", "ftruncate",
"fchmod", "fchown", "getpriority", "setpriority", "profil", "statfs",
"fstatfs", "ioperm", "socketcall", "syslog", "setitimer", "getitimer",
"stat", "lstat", "fstat", "olduname", "iopl", "vhangup", "idle",
"vm86old", "wait4", "swapoff", "sysinfo", "ipc", "fsync", "sigreturn",
"clone", "setdomainname", "uname", "modify_ldt", "adjtimex",
"mprotect", "sigprocmask", "create_module", "init_module",
"delete_module", "get_kernel_syms", "quotactl", "getpgid", "fchdir",
"bdflush", "sysfs", "personality", "afs_syscall", "setfsuid",
"setfsgid", "_llseek", "getdents", "_newselect", "flock", "msync",
"readv", "writev", "getsid", "fdatasync", "_sysctl", "mlock",
"munlock", "mlockall", "munlockall", "sched_setparam",
"sched_getparam", "sched_setscheduler", "sched_getscheduler",
"sched_yield", "sched_get_priority_max", "sched_get_priority_min",
"sched_rr_get_interval", "nanosleep", "mremap", "setresuid",
"getresuid", "vm86", "query_module", "poll", "nfsservctl",
"setresgid", "getresgid", "prctl","rt_sigreturn","rt_sigaction",
"rt_sigprocmask", "rt_sigpending", "rt_sigtimedwait",
"rt_sigqueueinfo", "rt_sigsuspend", "pread", "pwrite", "chown",
"getcwd", "capget", "capset", "sigaltstack", "sendfile", "getpmsg",
"putpmsg", "vfork", "ugetrlimit", "mmap2", "truncate64",
"ftruncate64", "stat64", "lstat64", "fstat64", "lchown32", "getuid32",
"getgid32", "geteuid32", "getegid32", "setreuid32", "setregid32",
"getgroups32", "setgroups32", "fchown32", "setresuid32",
"getresuid32", "setresgid32", "getresgid32", "chown32", "setuid32",
"setgid32", "setfsuid32", "setfsgid32", "pivot_root", "mincore",
"madvise", "madvise1", "getdents64", "fcntl64", 0, "security", "gettid",
"readahead", "setxattr", "lsetxattr", "fsetxattr", "getxattr",
"lgetxattr", "fgetxattr", "listxattr", "llistxattr", "flistxattr",
"removexattr", "lremovexattr", "fremovexattr", "tkill", "sendfile64",
"futex", "sched_setaffinity", "sched_getaffinity"};


int main()
{
pid_t child;
const int long_size = sizeof(long);
child = fork();
char c[20];
if(child == 0) {
	ptrace(PTRACE_TRACEME,0,NULL,NULL);
	execl("./a.out","a.out",NULL);
	}
	else {
		int status;
		union u {
			long val;
			char chars[long_size];
		}data;
		struct user_regs_struct regs;
		int start = 0;
		long ins;
		char ins_a[sizeof(long)+1];
		while(1){
			wait(&status);
			if(WIFEXITED(status))break;
			ptrace(PTRACE_GETREGS,child,NULL,&regs);
			ins = ptrace(PTRACE_PEEKTEXT,child, regs.eip,NULL);
			sprintf(ins_a,"%lx",ins);
			if(strstr(ins_a,"80cd")){
					printf("#eax is 0x%x\n#ebx is 0x%x\n"
					"#ecx is 0x%x\n#edx is 0x%x\n"
					"#entering systcall \"%s\"\n",
					regs.eax,regs.ebx,regs.ecx,
					regs.edx,syscall_names[regs.eax]);
					printf("To stop type stop. To change syscall type change.\n");
					scanf("%s",c);
					printf("%s\n",c);
					if(!(strncmp(c,"stop",4))) exit(0) ;
	
					} 
			ptrace(PTRACE_SINGLESTEP,child,NULL,NULL);
		}
		
	}
	return 0;	
}