sys_semtimedop: fix timeval argument index in wrapped call
Looking at the implementation of wrapped semtimedop() call inside glibc
and kernel, I started to believe that timeval should be located in
tcp->u_arg[4] and not tcp->u_arg[5]. Fortunately, tcp->u_arg[5] now
works correctly as well, due to side effects of decode_ipc_subcall().
declaration in header:
int semtimedop(semid, *sops, nsops, *timeout);
0 1 2 3
sys_ipc arguments in glibc on all patforms except s390*:
semid, (int) nsops, 0, CHECK_N (sops, nsops), timeout
0 1 2 3 4
We have to use indexes: 0 3 1 4
sys_ipc arguments on s390*:
semid, (int) nsops, timeout, sops
0 1 2 3
We have to use indexes: 0 3 1 2
* ipc.c (sys_semtimedop) [!S390]: Fix timeval argument index in
indirect_ipccall case.
diff --git a/ipc.c b/ipc.c
index 0bde1cf..859ee28 100644
--- a/ipc.c
+++ b/ipc.c
@@ -330,7 +330,7 @@
#if defined(S390)
printtv(tcp, tcp->u_arg[2]);
#else
- printtv(tcp, tcp->u_arg[5]);
+ printtv(tcp, tcp->u_arg[4]);
#endif
} else {
tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);