source: trunk/minix/servers/is/main.c@ 13

Last change on this file since 13 was 9, checked in by Mattia Monga, 15 years ago

Minix 3.1.2a
File size: 5.7 KB
Line 
1/* System Information Service.
2 * This service handles the various debugging dumps, such as the process
3 * table, so that these no longer directly touch kernel memory. Instead, the
4 * system task is asked to copy some table in local memory.
5 *
6 * Created:
7 * Apr 29, 2004 by Jorrit N. Herder
8 */
9
10#include "inc.h"
11
12/* Set debugging level to 0, 1, or 2 to see no, some, all debug output. */
13#define DEBUG_LEVEL 1
14#define DPRINTF if (DEBUG_LEVEL > 0) printf
15
16/* Allocate space for the global variables. */
17message m_in; /* the input message itself */
18message m_out; /* the output message used for reply */
19int who_e; /* caller's proc number */
20int callnr; /* system call number */
21
22extern int errno; /* error number set by system library */
23
24/* Declare some local functions. */
25FORWARD _PROTOTYPE(void init_server, (int argc, char **argv) );
26FORWARD _PROTOTYPE(void sig_handler, (void) );
27FORWARD _PROTOTYPE(void exit_server, (void) );
28FORWARD _PROTOTYPE(void get_work, (void) );
29FORWARD _PROTOTYPE(void reply, (int whom, int result) );
30
31/*===========================================================================*
32 * main *
33 *===========================================================================*/
34PUBLIC int main(int argc, char **argv)
35{
36/* This is the main routine of this service. The main loop consists of
37 * three major activities: getting new work, processing the work, and
38 * sending the reply. The loop never terminates, unless a panic occurs.
39 */
40 int result;
41 sigset_t sigset;
42
43 /* Initialize the server, then go to work. */
44 init_server(argc, argv);
45
46 /* Main loop - get work and do it, forever. */
47 while (TRUE) {
48
49 /* Wait for incoming message, sets 'callnr' and 'who'. */
50 get_work();
51
52 switch (callnr) {
53 case SYS_SIG:
54 printf("got SYS_SIG message\n");
55 sigset = m_in.NOTIFY_ARG;
56 for ( result=0; result< _NSIG; result++) {
57 if (sigismember(&sigset, result))
58 printf("signal %d found\n", result);
59 }
60 continue;
61 case PROC_EVENT:
62 sig_handler();
63 continue;
64 case FKEY_PRESSED:
65 result = do_fkey_pressed(&m_in);
66 break;
67 case DEV_PING:
68 notify(m_in.m_source);
69 continue;
70 default:
71 report("IS","warning, got illegal request from:", m_in.m_source);
72 result = EINVAL;
73 }
74
75 /* Finally send reply message, unless disabled. */
76 if (result != EDONTREPLY) {
77 reply(who_e, result);
78 }
79 }
80 return(OK); /* shouldn't come here */
81}
82
83/*===========================================================================*
84 * init_server *
85 *===========================================================================*/
86PRIVATE void init_server(int argc, char **argv)
87{
88/* Initialize the information service. */
89 int fkeys, sfkeys;
90 int i, s;
91 struct sigaction sigact;
92
93 /* Install signal handler. Ask PM to transform signal into message. */
94 sigact.sa_handler = SIG_MESS;
95 sigact.sa_mask = ~0; /* block all other signals */
96 sigact.sa_flags = 0; /* default behaviour */
97 if (sigaction(SIGTERM, &sigact, NULL) < 0)
98 report("IS","warning, sigaction() failed", errno);
99
100 /* Set key mappings. IS takes all of F1-F12 and Shift+F1-F6. */
101 fkeys = sfkeys = 0;
102 for (i=1; i<=12; i++) bit_set(fkeys, i);
103 for (i=1; i<= 8; i++) bit_set(sfkeys, i);
104 if ((s=fkey_map(&fkeys, &sfkeys)) != OK)
105 report("IS", "warning, fkey_map failed:", s);
106}
107
108/*===========================================================================*
109 * sig_handler *
110 *===========================================================================*/
111PRIVATE void sig_handler()
112{
113 sigset_t sigset;
114 int sig;
115
116 /* Try to obtain signal set from PM. */
117 if (getsigset(&sigset) != 0) return;
118
119 /* Check for known signals. */
120 if (sigismember(&sigset, SIGTERM)) {
121 exit_server();
122 }
123}
124
125/*===========================================================================*
126 * exit_server *
127 *===========================================================================*/
128PRIVATE void exit_server()
129{
130/* Shut down the information service. */
131 int fkeys, sfkeys;
132 int i,s;
133
134 /* Release the function key mappings requested in init_server().
135 * IS took all of F1-F12 and Shift+F1-F6.
136 */
137 fkeys = sfkeys = 0;
138 for (i=1; i<=12; i++) bit_set(fkeys, i);
139 for (i=1; i<= 7; i++) bit_set(sfkeys, i);
140 if ((s=fkey_unmap(&fkeys, &sfkeys)) != OK)
141 report("IS", "warning, unfkey_map failed:", s);
142
143 /* Done. Now exit. */
144 exit(0);
145}
146
147/*===========================================================================*
148 * get_work *
149 *===========================================================================*/
150PRIVATE void get_work()
151{
152 int status = 0;
153 status = receive(ANY, &m_in); /* this blocks until message arrives */
154 if (OK != status)
155 panic("IS","failed to receive message!", status);
156 who_e = m_in.m_source; /* message arrived! set sender */
157 callnr = m_in.m_type; /* set function call number */
158}
159
160/*===========================================================================*
161 * reply *
162 *===========================================================================*/
163PRIVATE void reply(who, result)
164int who; /* destination */
165int result; /* report result to replyee */
166{
167 int send_status;
168 m_out.m_type = result; /* build reply message */
169 send_status = send(who, &m_out); /* send the message */
170 if (OK != send_status)
171 panic("IS", "unable to send reply!", send_status);
172}
173
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