[multiprocess] Linux-nat multiprocess switch

[teawater <teawater at gmail dot com>]

Hi,

I got and test the multiprocess branch. And can't find a interface to
switch the process.
So I make this example patch make multiprocess be switched in
linux-nat. It still have a lot of bugs.

I will make it better if you guys like it.

Example:
(gdb) list
During symbol reading, DW_AT_name missing from DW_TAG_base_type.
5	#include <unistd.h>
6	#include <errno.h>
7	#include <sys/stat.h>
8	#include <fcntl.h>
9	#include <stdint.h>
10	
11	int
12	main(int argc,char *argv[],char *envp[])
13	{
14		pid_t	pid = fork ();
(gdb)
15	
16		if (pid == 0) {
17			while (1) {
18				printf ("%d: C\n", getpid ());
19				sleep (2);
20			}
21		}
22		else {
23			while (1) {
24				printf ("%d: F\n", getpid ());
(gdb)
25				sleep (2);
26			}
27		}
28	
29		return (0);
30	}
31	
(gdb) set detach-on-fork off
(gdb) set follow-fork-mode child
(gdb) r
Starting program: /home/teawater/multiprocess/a.out
9004: C
9001: F
9004: C
9001: F
9004: C
9001: F

Program received signal SIGINT, Interrupt.
0xb7fe3410 in __kernel_vsyscall ()
(gdb) info inferiors
  3 9004 a.out
* 2 9001 a.out
  1 0 #a.out# /home/teawater/multiprocess/a.out
(gdb) b 18
Breakpoint 1 at 0x8048433: file 1.c, line 18.
(gdb) c
Continuing.
9004: C
9001: F
9004: C
9001: F

Program received signal SIGINT, Interrupt.
0xb7fe3410 in __kernel_vsyscall ()
(gdb) switch-inferior 3
(gdb) c
Continuing.
9001: F

Breakpoint 1, main (argc=<value optimized out>, argv=<value optimized out>,
    envp=<value optimized out>) at 1.c:18
18				printf ("%d: C\n", getpid ());


Thanks,
Hui

Attachment: inferior-switch.txt
Description: Text document