gdb/

gdb/
	* defs.h (parse_pid_to_attach): New.
	* utils.c (parse_pid_to_attach): New.
	* darwin-nat.c (darwin_attach): Replace ARGS parsing by parse_pid.
	* gnu-nat.c (gnu_attach): Likewise.
	* nto-procfs.c (procfs_attach): Likewise.
	* procfs.c (procfs_attach): Likewise.
	* windows-nat.c (windows_attach): Likewise.
	* inf-ptrace.c (inf_ptrace_attach): Likewise.  Remove variable dummy.
	* inf-ttrace.c (inf_ttrace_attach): Likewise.
	* remote.c (extended_remote_attach_1): Likewise.  New comment on getpid
	check.

gdb/testsuite/
	* gdb.base/attach.exp (attach to nonsense is prohibited): Make the
	"Illegal process-id" expect string more exact.
	(attach to digits-starting nonsense is prohibited): New.