gdb/Changelog:
2015-12-16  Brian Vandenberg <phantall@gmail.com>

	PR gdb/17903
	* gdb/procfs.c (inclusions): Included ansidecl.h for UNUSED_ARG
	(procfs_target): added procfs_child_pid_to_exec_file to target_ops struct
	(procfs_child_pid_to_exec_file): to_pid_to_exec_file implementation for solaris

diff --git a/gdb/procfs.c b/gdb/procfs.c
index 7b7ff45..a663223 100644
--- a/gdb/procfs.c
+++ b/gdb/procfs.c
@@ -51,6 +51,7 @@
 #include "auxv.h"
 #include "procfs.h"
 #include "observer.h"
+#include "ansidecl.h"

/* This module provides the interface between GDB and the
   /proc file system, which is used on many versions of Unix
@@ -118,6 +119,7 @@ static void procfs_fetch_registers (struct target_ops *,
                                    struct regcache *, int);
 static void procfs_store_registers (struct target_ops *,
                                    struct regcache *, int);
+static char* procfs_child_pid_to_exec_file( struct target_ops*, int );
 static void procfs_pass_signals (struct target_ops *self,
                                 int, unsigned char *);
 static void procfs_kill_inferior (struct target_ops *ops);
@@ -192,6 +194,7 @@procfs_target (void)
   t->to_resume = procfs_resume;
   t->to_fetch_registers = procfs_fetch_registers;
   t->to_store_registers = procfs_store_registers;
+  t->to_pid_to_exec_file = procfs_child_pid_to_exec_file;
   t->to_xfer_partial = procfs_xfer_partial;
   t->to_pass_signals = procfs_pass_signals;
   t->to_files_info = procfs_files_info;
@@ -3301,6 +3304,41 @@ procfs_store_registers (struct target_ops *ops,
     }
 }

+/* "self" may not exist on some platforms,
+ * otherwise that would be preferable to
+ * a format string. */
+static const char *proc_path_lookup[] = {
+  "/proc/%u/path/a.out" // Most UNIXes with procfs (Solaris)
+, "/proc/%u/file"       // BSD
+, "/proc/%u/exe"        // Linux, Windows, NetBSD
+, "/proc/%u/a.out"      // No idea, I've only seen references to it
+};
+
+/* Get a fully qualified path to the debugged process */
+static char* procfs_child_pid_to_exec_file( struct target_ops *ARG_UNUSED(self), int pid ) {
+  static char buf[PATH_MAX] = {0};
+  char name[PATH_MAX] = {0};
+  ssize_t sz = -1;
+  size_t ii = 0;
+
+  pid = pid >= 0 ? pid : -pid;
+
+  for( ii = 0; ii < sizeof(proc_path_lookup)/sizeof(proc_path_lookup[0]); ++ii ) {
+    xsnprintf( name, sizeof(name), proc_path_lookup[ii], (unsigned int)pid );
+    sz = readlink( name, buf, sizeof( name ) );
+
+    if( 0 < sz ) {
+      buf[sz] = '\0';
+      return buf;
+    }
+  }
+
+  /* This is the default behavior as defined in target.h
+   * and implemented in inf_child_pid_to_exec_file() */
+  return NULL;
+}
+