diff mbox series

linux-user: Fix "print_fdset()" in "strace.c" to not print ", " after last value

Message ID 20200702102749.22178-1-Filip.Bozuta@syrmia.com
State New
Headers show
Series linux-user: Fix "print_fdset()" in "strace.c" to not print ", " after last value | expand

Commit Message

Filip Bozuta July 2, 2020, 10:27 a.m. UTC 
Function "print_fdset()" in "strace.c" is used to print the file descriptor
values in "print__newselect()" which prints arguments of syscall _newselect().
Until changes from this patch, this function was printing "," even after the
last value of the fd_set argument. This was changed in this patch by removing
this unnecessary "," after the last fd value and thus improving the estetics of
the _newselect() "-strace" print.

Implementation notes:

   The printing fix was made possible by using an existing function "get_comma()"
   which returns a "," or an empty string "" based on its argument (0 for "," and
   other for "").
---
 linux-user/strace.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/linux-user/strace.c b/linux-user/strace.c
index 6044c66954..23ca5d88c8 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -541,6 +541,7 @@  static void
 print_fdset(int n, abi_ulong target_fds_addr)
 {
     int i;
+    int first = 1;
 
     qemu_log("[");
     if( target_fds_addr ) {
@@ -555,9 +556,12 @@  print_fdset(int n, abi_ulong target_fds_addr)
             return;
 
         for (i=n; i>=0; i--) {
-            if ((tswapal(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
-                qemu_log("%d,", i);
+            if ((tswapal(target_fds[i / TARGET_ABI_BITS]) >>
+                (i & (TARGET_ABI_BITS - 1))) & 1) {
+                qemu_log("%s%d", get_comma(first), i);
+                first = 0;
             }
+        }
         unlock_user(target_fds, target_fds_addr, 0);
     }
     qemu_log("]");