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From: Alexander Graf <agraf@suse.de>
To: adrian@suse.de
Cc: Peter Maydell <peter.maydell@linaro.org>, Riku Voipio <riku.voipio@linaro.org>
Subject: [PATCH] linux-user: Implement prlimit64 syscall
Date: Thu, 29 Sep 2011 11:00:25 +0200
Message-Id: <1317286825-2033-1-git-send-email-agraf@suse.de>
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From: Peter Maydell <peter.maydell@linaro.org>

Implement the prlimit64 syscall.

Slightly modified to apply upstream -Riku

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>

Index: qemu-0.14.1/linux-user/syscall.c
===================================================================
--- qemu-0.14.1.orig/linux-user/syscall.c
+++ qemu-0.14.1/linux-user/syscall.c
@@ -524,6 +524,21 @@ static int sys_inotify_init1(int flags)
 #endif /* CONFIG_INOTIFY  */
 
 
+#if defined(TARGET_NR_prlimit64)
+#ifndef __NR_prlimit64
+# define __NR_prlimit64 -1
+#endif
+#define __NR_sys_prlimit64 __NR_prlimit64
+/* The glibc rlimit structure may not be that used by the underlying syscall */
+struct host_rlimit64 {
+    uint64_t rlim_cur;
+    uint64_t rlim_max;
+};
+_syscall4(int, sys_prlimit64, pid_t, pid, int, resource,
+          const struct host_rlimit64 *, new_limit,
+          struct host_rlimit64 *, old_limit)
+#endif
+
 extern int personality(int);
 extern int flock(int, int);
 extern int setfsuid(int);
@@ -7620,6 +7635,34 @@ abi_long do_syscall(void *cpu_env, int n
         break;
     }
 #endif
+#ifdef TARGET_NR_prlimit64
+    case TARGET_NR_prlimit64:
+    {
+        /* args: pid, resource number, ptr to new rlimit, ptr to old rlimit */
+        struct target_rlimit64 *target_rnew, *target_rold;
+        struct host_rlimit64 rnew, rold, *rnewp = 0;
+        if (arg3) {
+            if (!lock_user_struct(VERIFY_READ, target_rnew, arg3, 1)) {
+                goto efault;
+            }
+            rnew.rlim_cur = tswap64(target_rnew->rlim_cur);
+            rnew.rlim_max = tswap64(target_rnew->rlim_max);
+            unlock_user_struct(target_rnew, arg3, 0);
+            rnewp = &rnew;
+        }
+
+        ret = get_errno(sys_prlimit64(arg1, arg2, rnewp, arg4 ? &rold : 0));
+        if (!is_error(ret) && arg4) {
+            if (!lock_user_struct(VERIFY_WRITE, target_rold, arg4, 1)) {
+                goto efault;
+            }
+            target_rold->rlim_cur = tswap64(rold.rlim_cur);
+            target_rold->rlim_max = tswap64(rold.rlim_max);
+            unlock_user_struct(target_rold, arg4, 1);
+        }
+        break;
+    }
+#endif
 
     default:
     unimplemented:
Index: qemu-0.14.1/linux-user/syscall_defs.h
===================================================================
--- qemu-0.14.1.orig/linux-user/syscall_defs.h
+++ qemu-0.14.1/linux-user/syscall_defs.h
@@ -2237,6 +2237,11 @@ struct target_mq_attr {
     abi_long mq_curmsgs;
 };
 
+struct target_rlimit64 {
+    uint64_t rlim_cur;
+    uint64_t rlim_max;
+};
+
 #include "socket.h"
 
 #include "errno_defs.h"