[PATCH v4] linux-user: Add close_range() syscall

[Helge Deller <deller@gmx.de>]

Signed-off-by: Helge Deller <deller@gmx.de>
---
Changes:
v4: Fix check for arg2
v3: fd_trans_unregister() only called if close_range() doesn't fail
v2: consider CLOSE_RANGE_CLOEXEC flag

diff --git a/linux-user/strace.list b/linux-user/strace.list
index 3df2184580..cd995e5d56 100644
--- a/linux-user/strace.list
+++ b/linux-user/strace.list
@@ -103,6 +103,9 @@
 #ifdef TARGET_NR_close
 { TARGET_NR_close, "close" , "%s(%d)", NULL, NULL },
 #endif
+#ifdef TARGET_NR_close_range
+{ TARGET_NR_close_range, "close_range" , "%s(%u,%u,%u)", NULL, NULL },
+#endif
 #ifdef TARGET_NR_connect
 { TARGET_NR_connect, "connect" , "%s(%d,%#x,%d)", NULL, NULL },
 #endif
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 12195d4e99..984039f928 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -339,6 +339,13 @@ _syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
 #ifdef __NR_exit_group
 _syscall1(int,exit_group,int,error_code)
 #endif
+#if defined(__NR_close_range) && defined(TARGET_NR_close_range)
+#define __NR_sys_close_range __NR_close_range
+_syscall3(int,sys_close_range,int,first,int,last,int,flags)
+#ifndef CLOSE_RANGE_CLOEXEC
+#define CLOSE_RANGE_CLOEXEC     (1U << 2)
+#endif
+#endif
 #if defined(__NR_futex)
 _syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
           const struct timespec *,timeout,int *,uaddr2,int,val3)
@@ -8735,6 +8742,24 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
     case TARGET_NR_close:
         fd_trans_unregister(arg1);
         return get_errno(close(arg1));
+#if defined(__NR_close_range) && defined(TARGET_NR_close_range)
+    case TARGET_NR_close_range:
+        ret = get_errno(sys_close_range(arg1, arg2, arg3));
+        if (ret == 0 && !(arg3 & CLOSE_RANGE_CLOEXEC)) {
+            abi_long fd;
+            abi_long maxfd = arg2;
+
+            if ((sizeof(abi_long) == 4 && arg2 == (abi_long)0x7FFFFFFFUL) ||
+                (sizeof(abi_long) == 8 && arg2 == (abi_long)0x7FFFFFFFFFFFFFFFULL)) {
+                maxfd = target_fd_max;
+            }
+
+            for (fd = arg1; fd < maxfd; fd++) {
+                fd_trans_unregister(fd);
+            }
+        }
+        return ret;
+#endif

     case TARGET_NR_brk:
         return do_brk(arg1);