[PATCH 1/2] gdbserver, read_ptid: handle '0' and '-1' thread ids

[Markus Metzger <markus.t.metzger@intel.com>]

The special thread id '-1' means 'all threads'.
The special thread id '0' means 'any thread'.

Read_ptid () currently returns

    <current pid>.-1.0

and

    <current pid>.0.0

respectively.

Change that to minus_one_ptid for '-1' and to null_ptid for '0'.

CC: Thiago Jung Bauermann  <thiago.bauermann@linaro.org>
---
 gdbserver/remote-utils.cc | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gdbserver/remote-utils.cc b/gdbserver/remote-utils.cc
index 15f073dd6be..9562cc2e1fb 100644
--- a/gdbserver/remote-utils.cc
+++ b/gdbserver/remote-utils.cc
@@ -566,6 +566,26 @@ read_ptid (const char *buf, const char **obuf)
   const char *p = buf;
   const char *pp;
 
+  /* Handle special thread ids.  */
+  if (*p == '0')
+    {
+      if (obuf)
+	*obuf = p + 1;
+
+      return null_ptid;
+    }
+
+  if (*p == '-')
+    {
+      if (p[1] != '1')
+	return null_ptid;
+
+      if (obuf)
+	*obuf = p + 2;
+
+      return minus_one_ptid;
+    }
+
   if (*p == 'p')
     {
       ULONGEST pid;
-- 
2.34.1

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