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authorMark Wielaard <mjw@redhat.com>2013-12-23 14:20:06 +0100
committerMark Wielaard <mjw@redhat.com>2013-12-25 22:24:56 +0100
commit97bbf9b7ca002aab236bf750aba699d81f7985f7 (patch)
treee817c431270bb134dc7abf18a423ccda48b77a36 /libdwfl
parent3e98ab73f31ed35fcd83e0e1a01147a559d1858b (diff)
downloadelfutils-97bbf9b7ca002aab236bf750aba699d81f7985f7.tar.gz
libdwfl: linux-pid-attach.c: Report actual PID (Tgid) to dwfl_attach_state.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
Diffstat (limited to 'libdwfl')
-rw-r--r--libdwfl/ChangeLog5
-rw-r--r--libdwfl/linux-pid-attach.c24
2 files changed, 29 insertions, 0 deletions
diff --git a/libdwfl/ChangeLog b/libdwfl/ChangeLog
index 13a4ff9d..8e50f2f2 100644
--- a/libdwfl/ChangeLog
+++ b/libdwfl/ChangeLog
@@ -1,3 +1,8 @@
+2013-12-23 Mark Wielaard <mjw@redhat.com>
+
+ * linux-pid-attach.c (__libdwfl_attach_state_for_pid): Report actual
+ pid (thread group leader) to dwfl_attach_state.
+
2013-12-21 Mark Wielaard <mjw@redhat.com>
* frame_unwind.c (handle_cfi): Track whether the return register
diff --git a/libdwfl/linux-pid-attach.c b/libdwfl/linux-pid-attach.c
index 2e1d3592..70bd666a 100644
--- a/libdwfl/linux-pid-attach.c
+++ b/libdwfl/linux-pid-attach.c
@@ -285,6 +285,30 @@ bool
internal_function
__libdwfl_attach_state_for_pid (Dwfl *dwfl, pid_t pid)
{
+ char buffer[36];
+ FILE *procfile;
+
+ /* Make sure to report the actual PID (thread group leader) to
+ dwfl_attach_state. */
+ snprintf (buffer, sizeof (buffer), "/proc/%ld/status", (long) pid);
+ procfile = fopen (buffer, "r");
+ if (procfile == NULL)
+ return false;
+
+ char *line = NULL;
+ size_t linelen = 0;
+ while (getline (&line, &linelen, procfile) >= 0)
+ if (strncmp (line, "Tgid:", 5) == 0)
+ {
+ pid = atoi (&line[5]);
+ break;
+ }
+ free (line);
+ fclose (procfile);
+
+ if (pid == 0)
+ return false;
+
char dirname[64];
int i = snprintf (dirname, sizeof (dirname), "/proc/%ld/task", (long) pid);
assert (i > 0 && i < (ssize_t) sizeof (dirname) - 1);