8fea5ab8bd
The set of processes to which a SIGKMESS signal is sent whenever new diagnostics messages are added to the kernel's message buffer, is now no longer hardcoded. Instead, processes can (un)register themselves to receive such notifications, by means of sys_diagctl(). Change-Id: I9d6ac006a5d9bbfad2757587a068fc1ec3cc083e
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_DIAGCTL
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*
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* The parameters for this kernel call are:
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* DIAGCTL_CODE request
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* and then request-specific arguments in DIAGCTL_ARG1 and DIAGCTL_ARG2.
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*/
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#include "kernel/system.h"
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/*===========================================================================*
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* do_diagctl *
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*===========================================================================*/
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int do_diagctl(struct proc * caller, message * m_ptr)
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{
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vir_bytes len, buf;
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static char mybuf[DIAG_BUFSIZE];
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int s, i, proc_nr;
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switch (m_ptr->DIAGCTL_CODE) {
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case DIAGCTL_CODE_DIAG:
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buf = (vir_bytes) m_ptr->DIAGCTL_ARG1;
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len = (vir_bytes) m_ptr->DIAGCTL_ARG2;
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if(len < 1 || len > DIAG_BUFSIZE) {
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printf("do_diagctl: diag for %d: len %d out of range\n",
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caller->p_endpoint, len);
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return EINVAL;
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}
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if((s=data_copy_vmcheck(caller, caller->p_endpoint, buf, KERNEL,
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(vir_bytes) mybuf, len)) != OK) {
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printf("do_diagctl: diag for %d: len %d: copy failed: %d\n",
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caller->p_endpoint, len, s);
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return s;
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}
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for(i = 0; i < len; i++)
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kputc(mybuf[i]);
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kputc(END_OF_KMESS);
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return OK;
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case DIAGCTL_CODE_STACKTRACE:
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if(!isokendpt(m_ptr->DIAGCTL_ARG2, &proc_nr))
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return EINVAL;
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proc_stacktrace(proc_addr(proc_nr));
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return OK;
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case DIAGCTL_CODE_REGISTER:
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if (!(priv(caller)->s_flags & SYS_PROC))
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return EPERM;
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priv(caller)->s_diag_sig = TRUE;
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/* If the message log is not empty, send a first notification
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* immediately. After bootup the log is basically never empty.
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*/
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if (kmess.km_size > 0 && !kinfo.do_serial_debug)
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send_sig(caller->p_endpoint, SIGKMESS);
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return OK;
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case DIAGCTL_CODE_UNREGISTER:
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if (!(priv(caller)->s_flags & SYS_PROC))
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return EPERM;
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priv(caller)->s_diag_sig = FALSE;
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return OK;
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default:
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printf("do_diagctl: invalid request %d\n", m_ptr->DIAGCTL_CODE);
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return(EINVAL);
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}
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}
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