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 #include <minix/endpoint.h>
12
13 /* Allocate space for the global variables. */
14 static message m_in; /* the input message itself */
15 static message m_out; /* the output message used for reply */
16 static endpoint_t who_e; /* caller's proc number */
17 static int callnr; /* system call number */
18
19 /* Declare some local functions. */
20 static void get_work(void);
21 static void reply(int whom, int result);
22
23 /* SEF functions and variables. */
24 static void sef_local_startup(void);
25 static int sef_cb_init_fresh(int type, sef_init_info_t *info);
26 static void sef_cb_signal_handler(int signo);
27
28 /*===========================================================================*
29 * main *
30 *===========================================================================*/
main(int argc,char ** argv)31 int main(int argc, char **argv)
32 {
33 /* This is the main routine of this service. The main loop consists of
34 * three major activities: getting new work, processing the work, and
35 * sending the reply. The loop never terminates, unless a panic occurs.
36 */
37 int result;
38
39 /* SEF local startup. */
40 env_setargs(argc, argv);
41 sef_local_startup();
42
43 /* Main loop - get work and do it, forever. */
44 while (TRUE) {
45 /* Wait for incoming message, sets 'callnr' and 'who'. */
46 get_work();
47
48 if (is_notify(callnr)) {
49 switch (_ENDPOINT_P(who_e)) {
50 case TTY_PROC_NR:
51 result = do_fkey_pressed(&m_in);
52 break;
53 default:
54 /* FIXME: error message. */
55 result = EDONTREPLY;
56 break;
57 }
58 }
59 else {
60 printf("IS: warning, got illegal request %d from %d\n",
61 callnr, m_in.m_source);
62 result = EDONTREPLY;
63 }
64
65 /* Finally send reply message, unless disabled. */
66 if (result != EDONTREPLY) {
67 reply(who_e, result);
68 }
69 }
70 return(OK); /* shouldn't come here */
71 }
72
73 /*===========================================================================*
74 * sef_local_startup *
75 *===========================================================================*/
76 static void
sef_local_startup(void)77 sef_local_startup(void)
78 {
79 /* Register init callbacks. */
80 sef_setcb_init_fresh(sef_cb_init_fresh);
81 sef_setcb_init_lu(sef_cb_init_fresh);
82 sef_setcb_init_restart(sef_cb_init_fresh);
83
84 /* Register signal callbacks. */
85 sef_setcb_signal_handler(sef_cb_signal_handler);
86
87 /* Let SEF perform startup. */
88 sef_startup();
89 }
90
91 /*===========================================================================*
92 * sef_cb_init_fresh *
93 *===========================================================================*/
sef_cb_init_fresh(int UNUSED (type),sef_init_info_t * UNUSED (info))94 static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
95 {
96 /* Initialize the information server. */
97
98 /* Set key mappings. */
99 map_unmap_fkeys(TRUE /*map*/);
100
101 return(OK);
102 }
103
104 /*===========================================================================*
105 * sef_cb_signal_handler *
106 *===========================================================================*/
sef_cb_signal_handler(int signo)107 static void sef_cb_signal_handler(int signo)
108 {
109 /* Only check for termination signal, ignore anything else. */
110 if (signo != SIGTERM) return;
111
112 /* Shutting down. Unset key mappings, and quit. */
113 map_unmap_fkeys(FALSE /*map*/);
114
115 exit(0);
116 }
117
118 /*===========================================================================*
119 * get_work *
120 *===========================================================================*/
121 static void
get_work(void)122 get_work(void)
123 {
124 int status = 0;
125 status = sef_receive(ANY, &m_in); /* this blocks until message arrives */
126 if (OK != status)
127 panic("sef_receive failed!: %d", status);
128 who_e = m_in.m_source; /* message arrived! set sender */
129 callnr = m_in.m_type; /* set function call number */
130 }
131
132 /*===========================================================================*
133 * reply *
134 *===========================================================================*/
135 static void
reply(int who,int result)136 reply(
137 int who, /* destination */
138 int result /* report result to replyee */
139 )
140 {
141 int send_status;
142 m_out.m_type = result; /* build reply message */
143 send_status = ipc_send(who, &m_out); /* send the message */
144 if (OK != send_status)
145 panic("unable to send reply!: %d", send_status);
146 }
147
148
149