e4e21ee1b2
The new MIB service implements the sysctl(2) system call which, as we adopt more NetBSD code, is an increasingly important part of the operating system API. The system call is implemented in the new service rather than as part of an existing service, because it will eventually call into many other services in order to gather data, similar to ProcFS. Since the sysctl(2) functionality is used even by init(8), the MIB service is added to the boot image. MIB stands for Management Information Base, and the MIB service should be seen as a knowledge base of management information. The MIB service implementation of the sysctl(2) interface is fairly complete; it incorporates support for both static and dynamic nodes and imitates many NetBSD-specific quirks expected by userland. The patch also adds trace(1) support for the new system call, and adds a new test, test87, which tests the fundamental operation of the MIB service rather thoroughly. Change-Id: I4766b410b25e94e9cd4affb72244112c2910ff67
112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
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#include <sys/queue.h>
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/*
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* The maximum nesting depth of parentheses/brackets. The current maximum
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* depth is something like six, for UDS control messages. This constant can be
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* increased as necessary without any problem.
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*/
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#define MAX_DEPTH 10
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/*
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* The maximum size of text that may be recorded, including null terminator.
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* Increasing this allows longer lines to be recorded and replayed without
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* being cut short (see call_replay), but also increases memory usage.
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*/
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#define RECORD_BUFSZ 256
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struct trace_proc {
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/* identity (public) */
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pid_t pid;
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/* data structure management (proc.c) */
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TAILQ_ENTRY(trace_proc) next;
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/* general process state (trace.c) */
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char name[PROC_NAME_LEN];
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unsigned int trace_flags;
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reg_t last_pc;
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reg_t last_sp;
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/* call enter-to-leave state (call.c) */
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int call_type;
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vir_bytes m_addr;
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message m_out;
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const char *call_name;
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unsigned int call_flags;
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const struct call_handler *call_handler;
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int call_result;
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/* output state (output.c) */
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int recording;
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char outbuf[RECORD_BUFSZ];
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size_t outlen;
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/* formatting state (format.c) */
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const char *next_sep;
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int depth;
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struct {
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const char *sep;
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int name;
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} depths[MAX_DEPTH];
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/* ioctl state (ioctl.c) */
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int ioctl_index;
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unsigned int ioctl_flags;
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/* sysctl state (service/mib.c) */
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uint32_t sctl_flags;
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size_t sctl_size;
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int (*sctl_proc)(struct trace_proc *, const char *, int, const void *,
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vir_bytes, size_t);
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int sctl_arg;
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};
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/* Trace flags. */
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#define TF_INCALL 0x01 /* the process has entered a system call */
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#define TF_SKIP 0x02 /* the system call result is to be skipped */
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#define TF_CTX_SKIP 0x04 /* skip call result only if context changes */
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#define TF_STOPPING 0x08 /* the process is expecting a SIGSTOP */
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#define TF_ATTACH 0x10 /* we have not started this process */
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#define TF_DETACH 0x20 /* detach from the process as soon as we can */
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#define TF_EXEC 0x40 /* the process may be performing an execve() */
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#define TF_NOCALL 0x80 /* no system call seen yet (for info only) */
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/* Trace classes, determining how the tracer engine should handle a call. */
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#define TC_NORMAL 0 /* normal call, no exceptions required */
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#define TC_EXEC 1 /* exec call, success on subsequent SIGSTOP */
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#define TC_SIGRET 2 /* sigreturn call, success on context change */
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/* Call flags. */
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#define CF_DONE 0x01 /* printing the call parameters is done */
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#define CF_NORETURN 0x02 /* the call does not return on success */
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#define CF_HIDE 0x04 /* do not print the current call */
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#define CF_IPC_ERR 0x08 /* a failure occurred at the IPC level */
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#define CF_REG_ERR 0x10 /* unable to retrieve the result register */
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#define CF_MSG_ERR 0x20 /* unable to copy in the reply message */
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/* Call types, determining how much has been printed up to the call split. */
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#define CT_NOTDONE (0) /* not all parameters have been printed yet */
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#define CT_DONE (CF_DONE) /* all parameters have been printed */
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#define CT_NORETURN (CF_DONE | CF_NORETURN) /* the no-return call type */
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/* Put flags. */
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#define PF_FAILED 0x01 /* call failed, results may be invalid */
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#define PF_LOCADDR 0x02 /* pointer is into local address space */
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/* Yes, PF_LOCAL would conflict with the packet family definition. Bah. */
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#define PF_ALT 0x04 /* alternative output (callee specific) */
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#define PF_STRING PF_ALT /* buffer is string (put_buf only) */
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#define PF_FULL 0x08 /* print full format (callee specific) */
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#define PF_PATH (PF_STRING | PF_FULL) /* flags for path names */
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#define PF_NONAME 0x10 /* default to no field names at this depth */
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/* I/O control flags. */
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#define IF_OUT 0x1 /* call to print outgoing (written) data */
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#define IF_IN 0x2 /* call to print incoming (read) data */
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#define IF_ALL 0x4 /* all fields printed (not really a bit) */
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/* Sysctl processing types, determining what the callback function is to do. */
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#define ST_NAME 0 /* print the rest of the name */
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#define ST_OLDP 1 /* print the data pointed to by oldp */
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#define ST_NEWP 2 /* print the data pointed to by newp */
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