3cc092ff06
now used for printing diagnostic messages through the kernel message buffer. this lets processes print diagnostics without sending messages to tty and log directly, simplifying the message protocol a lot and reducing difficulties with deadlocks and other situations in which diagnostics are blackholed (e.g. grants don't work). this makes DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty and log still accept the codes for 'old' binaries. This also simplifies diagnostics in several servers and drivers - only tty needs its own kputc() now. . simplifications in vfs, and some effort to get the vnode references right (consistent) even during shutdown. m_mounted_on is now NULL for root filesystems (!) (the original and new root), a less awkward special case than 'm_mounted_on == m_root_node'. root now has exactly one reference, to root, if no files are open, just like all other filesystems. m_driver_e is unused.
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_SYSCTL
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*
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* The parameters for this kernel call are:
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* SYSCTL_CODE request
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* and then request-specific arguments in SYSCTL_ARG1 and SYSCTL_ARG2.
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*/
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#include "../system.h"
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#include "../vm.h"
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/*===========================================================================*
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* do_sysctl *
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*===========================================================================*/
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PUBLIC int do_sysctl(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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phys_bytes ph;
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vir_bytes len, buf;
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static char mybuf[DIAG_BUFSIZE];
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struct proc *caller;
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int s, i;
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caller = proc_addr(who_p);
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switch (m_ptr->SYSCTL_CODE) {
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case SYSCTL_CODE_DIAG:
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buf = (vir_bytes) m_ptr->SYSCTL_ARG1;
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len = (vir_bytes) m_ptr->SYSCTL_ARG2;
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if(len < 1 || len > DIAG_BUFSIZE) {
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kprintf("do_sysctl: 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((ph=umap_local(caller, D, buf, len)) == 0)
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return EFAULT;
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CHECKRANGE_OR_SUSPEND(caller, ph, len, 1);
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if((s=data_copy(who_e, buf, SYSTEM, (vir_bytes) mybuf, len)) != OK) {
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kprintf("do_sysctl: 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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break;
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default:
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kprintf("do_sysctl: invalid request %d\n", m_ptr->SYSCTL_CODE);
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return(EINVAL);
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}
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minix_panic("do_sysctl: can't happen", NO_NUM);
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return(OK);
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}
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