Introduce linux_proc_pid_to_exec_file

This commit introduces a new function linux_proc_pid_to_exec_file
that shared Linux code can use to discover the filename of the
executable that was run to create a process on the system.

gdb/ChangeLog:

	* nat/linux-procfs.h (linux_proc_pid_to_exec_file):
	New declaration.
	* nat/linux-procfs.c (linux_proc_pid_to_exec_file):
	New function, factored out from...
	* linux-nat.c (linux_child_pid_to_exec_file): ...here.

1 files changed, 1 insertions, 9 deletions

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 6c198cfe638..b04aa68c79d 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -4106,15 +4106,7 @@ linux_nat_thread_name (struct target_ops *self, struct thread_info *thr)
 static char *
 linux_child_pid_to_exec_file (struct target_ops *self, int pid)
 {
-  static char buf[PATH_MAX];
-  char name[PATH_MAX];
-
-  xsnprintf (name, PATH_MAX, "/proc/%d/exe", pid);
-  memset (buf, 0, PATH_MAX);
-  if (readlink (name, buf, PATH_MAX - 1) <= 0)
-    strcpy (buf, name);
-
-  return buf;
+  return linux_proc_pid_to_exec_file (pid);
 }
 
 /* Implement the to_xfer_partial interface for memory reads using the /proc