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authorPeter Maydell <peter.maydell@linaro.org>2016-06-03 12:08:45 +0100
committerPeter Maydell <peter.maydell@linaro.org>2016-06-06 19:10:37 +0100
commit3b34b77ea58eb93304a8a1c441ee85fdfb1671b2 (patch)
tree301e852b20d5951b6385d5c47eb3d3927ddf01ac
parent51feae5e384a4e11b87b9653ee628932e37492af (diff)
downloadqemu-arm-3b34b77ea58eb93304a8a1c441ee85fdfb1671b2.tar.gz
linux-user: Use safe_syscall wrapper for semop
Use the safe_syscall wrapper for the semop syscall or IPC operation. (We implement via the semtimedop syscall to make it easier to implement the guest semtimedop syscall later.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--linux-user/syscall.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d40d1a7320..8682ab0cff 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -719,6 +719,8 @@ safe_syscall4(int, msgsnd, int, msgid, const void *, msgp, size_t, sz,
int, flags)
safe_syscall5(int, msgrcv, int, msgid, void *, msgp, size_t, sz,
long, msgtype, int, flags)
+safe_syscall4(int, semtimedop, int, semid, struct sembuf *, tsops,
+ unsigned, nsops, const struct timespec *, timeout)
#else
/* This host kernel architecture uses a single ipc syscall; fake up
* wrappers for the sub-operations to hide this implementation detail.
@@ -727,6 +729,7 @@ safe_syscall5(int, msgrcv, int, msgid, void *, msgp, size_t, sz,
* sys/ipc.h ones. So we just define them here, and rely on them being
* the same for all host architectures.
*/
+#define Q_SEMTIMEDOP 4
#define Q_MSGSND 11
#define Q_MSGRCV 12
#define Q_IPCCALL(VERSION, OP) ((VERSION) << 16 | (OP))
@@ -741,6 +744,12 @@ static int safe_msgrcv(int msgid, void *msgp, size_t sz, long type, int flags)
{
return safe_ipc(Q_IPCCALL(1, Q_MSGRCV), msgid, sz, flags, msgp, type);
}
+static int safe_semtimedop(int semid, struct sembuf *tsops, unsigned nsops,
+ const struct timespec *timeout)
+{
+ return safe_ipc(Q_IPCCALL(0, Q_SEMTIMEDOP), semid, nsops, 0, tsops,
+ (long)timeout);
+}
#endif
#if defined(TARGET_NR_mq_open) && defined(__NR_mq_open)
safe_syscall5(int, mq_timedsend, int, mqdes, const char *, msg_ptr,
@@ -3039,7 +3048,7 @@ static inline abi_long do_semop(int semid, abi_long ptr, unsigned nsops)
if (target_to_host_sembuf(sops, ptr, nsops))
return -TARGET_EFAULT;
- return get_errno(semop(semid, sops, nsops));
+ return get_errno(safe_semtimedop(semid, sops, nsops, NULL));
}
struct target_msqid_ds