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comparison sbr/m_update.c @ 0:bce86c4163a3

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Initial revision
author kono
date Mon, 18 Apr 2005 23:46:02 +0900
parents
children 441a2190cfae
comparison
equal deleted inserted replaced
-1:000000000000 0:bce86c4163a3
1 /* m_update.c - update the profile */
2 #ifndef lint
3 static char ident[] = "@(#)$Id$";
4 #endif /* lint */
5
6 #include "../h/mh.h"
7 #include <stdio.h>
8 #include <signal.h>
9 #ifndef sigmask
10 #define sigmask(s) (1 << ((s) - 1))
11 #endif /* not sigmask */
12
13 static int m_chkids();
14
15 void m_update () {
16 int action;
17 #ifndef BSD42
18 TYPESIG (*hstat) (), (*istat) (), (*qstat) (), (*tstat) ();
19 #else /* BSD42 */
20 int smask;
21 #endif /* BSD42 */
22 register struct node *np;
23 FILE * out;
24
25 if (!(ctxflags & CTXMOD))
26 return;
27 ctxflags &= ~CTXMOD;
28
29 if ((action = m_chkids ()) > OK)
30 return; /* child did it for us */
31
32 #ifndef BSD42
33 hstat = signal (SIGHUP, SIG_IGN);
34 istat = signal (SIGINT, SIG_IGN);
35 qstat = signal (SIGQUIT, SIG_IGN);
36 tstat = signal (SIGTERM, SIG_IGN);
37 #else /* BSD42 */
38 smask = sigblock (sigmask (SIGHUP) | sigmask (SIGINT)
39 | sigmask (SIGQUIT) | sigmask (SIGTERM));
40 #endif /* BSD42 */
41
42 if ((out = fopen (ctxpath, "w")) == NULL)
43 adios (ctxpath, "unable to write");
44 for (np = m_defs; np; np = np -> n_next)
45 if (np -> n_context)
46 fprintf (out, "%s: %s\n", np -> n_name, np -> n_field);
47 (void) fclose (out);
48
49 #ifndef BSD42
50 (void) signal (SIGHUP, hstat);
51 (void) signal (SIGINT, istat);
52 (void) signal (SIGQUIT, qstat);
53 (void) signal (SIGTERM, tstat);
54 #else /* BSD42 */
55 (void) sigsetmask (smask);
56 #endif /* BSD42 */
57 if (action == OK)
58 _exit (0); /* we are child, time to die */
59 }
60
61 /* */
62
63 /* This hack brought to you so we can handle set[ug]id MH programs. If we
64 return NOTOK, then no fork is made, we update .mh_profile normally, and
65 return to the caller normally. If we return 0, then the child is
66 executing, .mh_profile is modified after we set our [ug]ids to the norm.
67 If we return > 0, then the parent is executed and .mh_profile has
68 already be modified. We can just return to the caller immediately. */
69
70
71 static int m_chkids () {
72 int i,
73 child_id;
74
75 if (getuid () == geteuid ())
76 return (NOTOK);
77
78 for (i = 0; (child_id = fork ()) == -1 && i < 5; i++)
79 sleep (5);
80 switch (child_id) {
81 case NOTOK:
82 break;
83
84 case OK:
85 (void) setgid (getgid ());
86 (void) setuid (getuid ());
87 break;
88
89 default:
90 (void) pidwait (child_id, NOTOK);
91 break;
92 }
93
94 return child_id;
95 }