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Provide pid_to_exec_file on Solaris (PR tdep/17903)

Message ID yddk1ng8qod.fsf@CeBiTec.Uni-Bielefeld.DE
State New, archived
Headers

Commit Message

Rainer Orth Sept. 20, 2018, 9:27 a.m. UTC 
  Hi Tom,

> Rainer> +  scoped_fd fd (open (name, O_RDONLY));
>
> You may wish to use gdb_open_cloexec.

this worked just as well, so after retesting on amd64-pc-solaris2.11,
I've committed the following patch.

Thanks.
        Rainer
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Patch

# HG changeset patch
# Parent  020f5ee983bb3daaef32d4d8424e6f60d24111c2
Provide pid_to_exec_file on Solaris

diff --git a/gdb/procfs.c b/gdb/procfs.c
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -128,6 +128,8 @@  public:
 
   const char *pid_to_str (ptid_t) override;
 
+  char *pid_to_exec_file (int pid) override;
+
   thread_control_capabilities get_thread_control_capabilities () override
   { return tc_schedlock; }
 
@@ -3138,6 +3140,35 @@  procfs_target::pid_to_str (ptid_t ptid)
   return buf;
 }
 
+/* Accepts an integer PID; Returns a string representing a file that
+   can be opened to get the symbols for the child process.  */
+
+char *
+procfs_target::pid_to_exec_file (int pid)
+{
+  static char buf[PATH_MAX];
+  char name[PATH_MAX];
+
+  /* Solaris 11 introduced /proc/<proc-id>/execname.  */
+  xsnprintf (name, PATH_MAX, "/proc/%d/execname", pid);
+  scoped_fd fd (gdb_open_cloexec (name, O_RDONLY, 0));
+  if (fd.get () < 0 || read (fd.get (), buf, PATH_MAX - 1) < 0)
+    {
+      /* If that fails, fall back to /proc/<proc-id>/path/a.out introduced in
+	 Solaris 10.  */
+      ssize_t len;
+
+      xsnprintf (name, PATH_MAX, "/proc/%d/path/a.out", pid);
+      len = readlink (name, buf, PATH_MAX - 1);
+      if (len <= 0)
+	strcpy (buf, name);
+      else
+	buf[len] = '\0';
+    }
+
+  return buf;
+}
+
 /* Insert a watchpoint.  */
 
 static int