Simple fixes.

* strace.c (usage): Document -d; document that -F is deprecated.
(droptcb): Print "<detached ...>" correctly for non-ff mode too.
(detach): Suppress a warning.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/strace.c b/strace.c
index c285656ee57675b364f250089db30cfdd5ec32b6..2c5c1b4fcb8d743c7a9217ec9a8f22077ec6d2c0 100644 (file)
--- a/strace.c
+++ b/strace.c
@@ -166,9 +166,10 @@ usage: strace [-CdDffhiqrtttTvVxxy] [-I n] [-a column] [-e expr]... [-o file]\n\
               [PROG [ARGS]]\n\
 -c -- count time, calls, and errors for each syscall and report summary\n\
 -C -- like -c but also print regular output while processes are running\n\
+-d -- enable debug output to stderr\n\
 -D -- run tracer process as a detached grandchild, not as parent\n\
 -f -- follow forks, -ff -- with output into separate files\n\
--F -- attempt to follow vforks\n\
+-F -- attempt to follow vforks (deprecated, use -f)\n\
 -i -- print instruction pointer at time of syscall\n\
 -I interruptible\n\
    1: no signals are blocked\n\
@@ -1547,17 +1548,23 @@ droptcb(struct tcb *tcp)
        if (debug_flag)
                fprintf(stderr, "dropped tcb for pid %d, %d remain\n", tcp->pid, nprocs);
 
+       if (tcp->outf) {
+               if (outfname && followfork >= 2) {
+                       if (tcp->curcol != 0)
+                               fprintf(tcp->outf, " <detached ...>\n");
+                       fclose(tcp->outf);
+                       if (outf == tcp->outf)
+                               outf = NULL;
+               } else {
+                       if (printing_tcp == tcp && tcp->curcol != 0)
+                               fprintf(tcp->outf, " <detached ...>\n");
+                       fflush(tcp->outf);
+               }
+       }
+
        if (printing_tcp == tcp)
                printing_tcp = NULL;
 
-       if (outfname && followfork >= 2 && tcp->outf) {
-               if (tcp->curcol != 0)
-                       fprintf(tcp->outf, " <detached>\n");
-               fclose(tcp->outf);
-       } else if (tcp->outf) {
-               fflush(tcp->outf);
-       }
-
        memset(tcp, 0, sizeof(*tcp));
 }
 
@@ -1585,6 +1592,7 @@ detach(struct tcb *tcp)
 #define PTRACE_DETACH PTRACE_SUNDETACH
 #endif
 
+       error = 0;
        sigstop_expected = 0;
        if (tcp->flags & TCB_ATTACHED) {
                /*