usr.bin/truss/syscalls.c

1017 	struct ptrace_io_desc iorequest;
1019 	iorequest.piod_op = PIOD_READ_D;
1020 	iorequest.piod_offs = offset;
1021 	iorequest.piod_addr = buf;
1022 	iorequest.piod_len = len;
1023 	if (ptrace(PT_IO, pid, (caddr_t)&iorequest, 0) < 0)
1038 	struct ptrace_io_desc iorequest;
1056 		iorequest.piod_op = PIOD_READ_D;
1057 		iorequest.piod_offs = (char *)addr + offset;
1058 		iorequest.piod_addr = buf + offset;
1059 		iorequest.piod_len = size;
1060 		if (ptrace(PT_IO, pid, (caddr_t)&iorequest, 0) < 0) {