| [9] | 1 | /* This file handle diagnostic output that is directly sent to the LOG driver.
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| 2 | * This output can either be a kernel message (announced through a SYS_EVENT
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| 3 | * with a SIGKMESS in the signal set) or output from another system process
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| 4 | * (announced through a DIAGNOSTICS message).
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| 5 | *
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| 6 | * Changes:
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| 7 | * 21 July 2005: Created (Jorrit N. Herder)
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <fcntl.h>
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| 12 |
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| 13 | #include "log.h"
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| 14 | #include "../../kernel/const.h"
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| 15 | #include "../../kernel/config.h"
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| 16 | #include "../../kernel/type.h"
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| 17 |
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| 18 | /*==========================================================================*
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| 19 | * do_new_kmess *
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| 20 | *==========================================================================*/
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| 21 | PUBLIC int do_new_kmess(m)
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| 22 | message *m; /* notification message */
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| 23 | {
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| 24 | /* Notification for a new kernel message. */
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| 25 | struct kmessages kmess; /* entire kmess structure */
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| 26 | char print_buf[KMESS_BUF_SIZE]; /* copy new message here */
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| 27 | static int prev_next = 0;
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| 28 | int bytes;
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| 29 | int i, r;
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| 30 |
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| 31 | if (m->m_source == TTY_PROC_NR)
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| 32 | {
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| 33 | message mess;
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| 34 |
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| 35 | /* Ask TTY driver for log output */
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| 36 | mess.GETKM_PTR= (char *) &kmess;
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| 37 | mess.m_type = GET_KMESS;
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| 38 | r= sendrec(TTY_PROC_NR, &mess);
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| 39 | if (r == OK) r= mess.m_type;
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| 40 | if (r != OK)
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| 41 | {
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| 42 | report("LOG","couldn't get copy of kmessages from TTY", r);
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| 43 | return EDONTREPLY;
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| 44 | }
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| 45 | }
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| 46 | else
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| 47 | {
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| 48 | /* Try to get a fresh copy of the buffer with kernel messages. */
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| 49 | if ((r=sys_getkmessages(&kmess)) != OK) {
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| 50 | report("LOG","couldn't get copy of kmessages", r);
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| 51 | return EDONTREPLY;
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| 52 | }
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| 53 | }
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| 54 |
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| 55 | /* Print only the new part. Determine how many new bytes there are with
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| 56 | * help of the current and previous 'next' index. Note that the kernel
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| 57 | * buffer is circular. This works fine if less then KMESS_BUF_SIZE bytes
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| 58 | * is new data; else we miss % KMESS_BUF_SIZE here.
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| 59 | * Check for size being positive, the buffer might as well be emptied!
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| 60 | */
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| 61 | if (kmess.km_size > 0) {
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| 62 | bytes = ((kmess.km_next + KMESS_BUF_SIZE) - prev_next) % KMESS_BUF_SIZE;
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| 63 | r=prev_next; /* start at previous old */
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| 64 | i=0;
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| 65 | while (bytes > 0) {
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| 66 | print_buf[i] = kmess.km_buf[(r%KMESS_BUF_SIZE)];
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| 67 | bytes --;
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| 68 | r ++;
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| 69 | i ++;
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| 70 | }
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| 71 | /* Now terminate the new message and save it in the log. */
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| 72 | print_buf[i] = 0;
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| 73 | log_append(print_buf, i);
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| 74 | }
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| 75 |
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| 76 | /* Almost done, store 'next' so that we can determine what part of the
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| 77 | * kernel messages buffer to print next time a notification arrives.
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| 78 | */
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| 79 | prev_next = kmess.km_next;
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| 80 | return EDONTREPLY;
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| 81 | }
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| 82 |
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| 83 | /*===========================================================================*
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| 84 | * do_diagnostics *
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| 85 | *===========================================================================*/
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| 86 | PUBLIC int do_diagnostics(message *m)
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| 87 | {
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| 88 | /* The LOG server handles all diagnostic messages from servers and device
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| 89 | * drivers. It forwards the message to the TTY driver to display it to the
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| 90 | * user. It also saves a copy in a local buffer so that messages can be
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| 91 | * reviewed at a later time.
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| 92 | */
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| 93 | int proc_nr_e;
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| 94 | vir_bytes src;
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| 95 | int count;
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| 96 | char c;
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| 97 | int i = 0;
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| 98 | static char diagbuf[10240];
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| 99 |
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| 100 | /* Change SELF to actual process number. */
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| 101 | if ((proc_nr_e = m->DIAG_ENDPT) == SELF)
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| 102 | m->DIAG_ENDPT = proc_nr_e = m->m_source;
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| 103 |
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| 104 | /* Now also make a copy for the private buffer at the LOG server, so
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| 105 | * that the messages can be reviewed at a later time.
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| 106 | */
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| 107 | src = (vir_bytes) m->DIAG_PRINT_BUF;
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| 108 | count = m->DIAG_BUF_COUNT;
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| 109 | while (count > 0 && i < sizeof(diagbuf)-1) {
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| 110 | if (sys_datacopy(proc_nr_e, src, SELF, (vir_bytes) &c, 1) != OK)
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| 111 | break; /* stop copying on error */
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| 112 | src ++;
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| 113 | count --;
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| 114 | diagbuf[i++] = c;
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| 115 | }
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| 116 | log_append(diagbuf, i);
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| 117 |
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| 118 | return OK;
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| 119 | }
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