source: trunk/minix/servers/pm/getset.c@ 11

Last change on this file since 11 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 2.2 KB
RevLine 
[9]1/* This file handles the 4 system calls that get and set uids and gids.
2 * It also handles getpid(), setsid(), and getpgrp(). The code for each
3 * one is so tiny that it hardly seemed worthwhile to make each a separate
4 * function.
5 */
6
7#include "pm.h"
8#include <minix/callnr.h>
9#include <minix/endpoint.h>
10#include <signal.h>
11#include "mproc.h"
12#include "param.h"
13
14/*===========================================================================*
15 * do_getset *
16 *===========================================================================*/
17PUBLIC int do_getset()
18{
19/* Handle GETUID, GETGID, GETPID, GETPGRP, SETUID, SETGID, SETSID. The four
20 * GETs and SETSID return their primary results in 'r'. GETUID, GETGID, and
21 * GETPID also return secondary results (the effective IDs, or the parent
22 * process ID) in 'reply_res2', which is returned to the user.
23 */
24
25 register struct mproc *rmp = mp;
26 int r, proc;
27
28 switch(call_nr) {
29 case GETUID:
30 r = rmp->mp_realuid;
31 rmp->mp_reply.reply_res2 = rmp->mp_effuid;
32 break;
33
34 case GETGID:
35 r = rmp->mp_realgid;
36 rmp->mp_reply.reply_res2 = rmp->mp_effgid;
37 break;
38
39 case GETPID:
40 r = mproc[who_p].mp_pid;
41 rmp->mp_reply.reply_res2 = mproc[rmp->mp_parent].mp_pid;
42 if(pm_isokendpt(m_in.endpt, &proc) == OK && proc >= 0)
43 rmp->mp_reply.reply_res3 = mproc[proc].mp_pid;
44 break;
45
46 case SETEUID:
47 case SETUID:
48 if (rmp->mp_realuid != (uid_t) m_in.usr_id &&
49 rmp->mp_effuid != SUPER_USER)
50 return(EPERM);
51 if(call_nr == SETUID) rmp->mp_realuid = (uid_t) m_in.usr_id;
52 rmp->mp_effuid = (uid_t) m_in.usr_id;
53 tell_fs(SETUID, who_e, rmp->mp_realuid, rmp->mp_effuid);
54 r = OK;
55 break;
56
57 case SETEGID:
58 case SETGID:
59 if (rmp->mp_realgid != (gid_t) m_in.grp_id &&
60 rmp->mp_effuid != SUPER_USER)
61 return(EPERM);
62 if(call_nr == SETGID) rmp->mp_realgid = (gid_t) m_in.grp_id;
63 rmp->mp_effgid = (gid_t) m_in.grp_id;
64 tell_fs(SETGID, who_e, rmp->mp_realgid, rmp->mp_effgid);
65 r = OK;
66 break;
67
68 case SETSID:
69 if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
70 rmp->mp_procgrp = rmp->mp_pid;
71 tell_fs(SETSID, who_e, 0, 0);
72 /* fall through */
73
74 case GETPGRP:
75 r = rmp->mp_procgrp;
76 break;
77
78 default:
79 r = EINVAL;
80 break;
81 }
82 return(r);
83}
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