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
344 lines
9.8 KiB
C
344 lines
9.8 KiB
C
/* ProcFS - service.c - the service subdirectory */
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#include "inc.h"
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#include <minix/rs.h>
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#include "rs/const.h"
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#include "rs/type.h"
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enum policy {
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POL_NONE = 0x00, /* user | endpoint */
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POL_RESET = 0x01, /* visible | change */
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POL_RESTART = 0x02, /* transparent | preserved */
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POL_LIVE_UPDATE = 0x04 /* transparent | preserved */
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};
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struct policies {
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#define MAX_POL_FORMAT_SZ 20
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char formatted[MAX_POL_FORMAT_SZ];
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enum policy supported;
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};
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typedef struct {
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struct rproc proc[NR_SYS_PROCS];
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struct rprocpub pub[NR_SYS_PROCS];
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} ixfer_rproc_t;
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static ixfer_rproc_t rproc;
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static struct policies policies[NR_SYS_PROCS];
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static struct inode *service_node;
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/* Updates the policies state from RS. Always returns an ASCIIZ string. */
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static const char *
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service_get_policies(struct policies * pol, index_t slot)
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{
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#if 1 /* The following should be retrieved from RS and formated instead. */
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int pos;
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char *ref_label;
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static const struct {
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const char *label;
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const char *policy_str;
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} def_pol[] = {
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/* audio */
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{ .label = "es1370", .policy_str = "reset" },
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{ .label = "es1371", .policy_str = "reset" },
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{ .label = "sb16", .policy_str = "reset" },
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/* bus */
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{ .label = "i2c", .policy_str = "restart" },
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{ .label = "pci", .policy_str = "restart" },
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{ .label = "ti1225", .policy_str = "restart" },
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/* clock */
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{ .label = "readclock.drv", .policy_str = "restart" },
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/* eeprom */
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{ .label = "cat24c256", .policy_str = "restart" },
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/* examples */
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{ .label = "hello", .policy_str = "restart" },
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/* hid */
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{ .label = "pckbd", .policy_str = "reset" },
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/* iommu */
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{ .label = "amddev", .policy_str = "" },
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/* net */
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{ .label = "3c90x", .policy_str = "reset" },
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{ .label = "atl2", .policy_str = "reset" },
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{ .label = "dec21140A", .policy_str = "reset" },
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{ .label = "dp8390", .policy_str = "reset" },
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{ .label = "dpeth", .policy_str = "reset" },
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{ .label = "e1000", .policy_str = "reset" },
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{ .label = "fxp", .policy_str = "reset" },
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{ .label = "lance", .policy_str = "reset" },
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{ .label = "lan8710a", .policy_str = "reset" },
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{ .label = "orinoco", .policy_str = "reset" },
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{ .label = "rtl8139", .policy_str = "reset" },
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{ .label = "rtl8169", .policy_str = "reset" },
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{ .label = "uds", .policy_str = "reset" },
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{ .label = "virtio_net", .policy_str = "reset" },
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/* power */
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{ .label = "acpi", .policy_str = "" },
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{ .label = "tps65217", .policy_str = "" },
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{ .label = "tps65590", .policy_str = "" },
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/* printer */
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{ .label = "printer", .policy_str = "restart" },
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/* sensors */
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{ .label = "bmp085", .policy_str = "" },
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{ .label = "sht21", .policy_str = "restart" },
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{ .label = "tsl2550", .policy_str = "restart" },
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/* storage */
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{ .label = "ahci", .policy_str = "reset" },
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{ .label = "at_wini", .policy_str = "reset" },
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{ .label = "fbd", .policy_str = "reset" },
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{ .label = "filter", .policy_str = "reset" },
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{ .label = "floppy", .policy_str = "reset" },
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{ .label = "memory", .policy_str = "restart" },
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{ .label = "mmc", .policy_str = "reset" },
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{ .label = "virtio_blk", .policy_str = "reset" },
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{ .label = "vnd", .policy_str = "reset" },
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/* system */
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{ .label = "gpio", .policy_str = "restart" },
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{ .label = "log", .policy_str = "reset" },
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{ .label = "random", .policy_str = "restart" },
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/* tty */
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{ .label = "pty", .policy_str = "restart" },
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{ .label = "tty", .policy_str = "restart" },
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/* usb */
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{ .label = "usbd", .policy_str = "" },
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{ .label = "usb_hub", .policy_str = "" },
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{ .label = "usb_storage", .policy_str = "" },
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/* video */
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{ .label = "fb", .policy_str = "" },
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{ .label = "tda19988", .policy_str = "" },
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/* vmm_guest */
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{ .label = "vbox", .policy_str = "" },
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/* fs */
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{ .label = "ext2", .policy_str = "" },
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{ .label = "hgfs", .policy_str = "" },
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{ .label = "isofs", .policy_str = "" },
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{ .label = "mfs", .policy_str = "restart" },
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{ .label = "pfs", .policy_str = "restart" },
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{ .label = "procfs", .policy_str = "restart" },
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{ .label = "ptyfs", .policy_str = "" },
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{ .label = "vbfs", .policy_str = "" },
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/* net */
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{ .label = "inet", .policy_str = "reset" },
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{ .label = "lwip", .policy_str = "" },
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/* servers */
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{ .label = "devman", .policy_str = "restart" },
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{ .label = "ds", .policy_str = "restart" },
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{ .label = "input", .policy_str = "reset" },
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{ .label = "ipc", .policy_str = "restart" },
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{ .label = "is", .policy_str = "restart" },
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{ .label = "mib", .policy_str = "restart" },
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{ .label = "pm", .policy_str = "restart" },
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{ .label = "rs", .policy_str = "restart" },
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{ .label = "sched", .policy_str = "restart" },
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{ .label = "vfs", .policy_str = "restart" },
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{ .label = "vm", .policy_str = "restart" },
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//{ .label = "", .policy_str = "" },
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};
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/* Find the related policy, based on the file name of the service. */
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ref_label = strrchr(rproc.pub[slot].proc_name, '/');
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if (NULL == ref_label)
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ref_label = rproc.pub[slot].proc_name;
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memset(pol[slot].formatted, 0, MAX_POL_FORMAT_SZ);
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for(pos = 0; pos < (sizeof(def_pol) / sizeof(def_pol[0])); pos++) {
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if (0 == strcmp(ref_label, def_pol[pos].label)) {
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(void)strncpy(pol[slot].formatted,
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def_pol[pos].policy_str, MAX_POL_FORMAT_SZ);
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pol[slot].formatted[MAX_POL_FORMAT_SZ-1] = '\0';
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break;
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}
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}
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#else
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/* Should do something sensible, based on flags from RS/SEF. */
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#endif
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return pol[slot].formatted;
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}
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/* Returns a ASCIIZ string encoding RS flags. */
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static const char *
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service_get_flags(index_t slot)
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{
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static char str[10];
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int flags, sys_flags;
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flags = rproc.proc[slot].r_flags;
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sys_flags = rproc.pub[slot].sys_flags;
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str[0] = (flags & RS_ACTIVE) ? 'A' : '-';
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str[1] = (flags & RS_UPDATING) ? 'U' : '-';
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str[2] = (flags & RS_EXITING) ? 'E' : '-';
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str[3] = (flags & RS_NOPINGREPLY) ? 'N' : '-';
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str[4] = (sys_flags & SF_USE_COPY) ? 'C' : '-';
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str[5] = (sys_flags & SF_USE_REPL) ? 'R' : '-';
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str[6] = (sys_flags & SF_NEED_COPY) ? 'c' : '-';
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str[7] = (sys_flags & SF_NEED_REPL) ? 'r' : '-';
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str[8] = (sys_flags & SF_CORE_SRV) ? 's' : '-';
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str[9] = '\0';
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return str;
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}
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/*
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* Return whether a slot is in use and active. The purpose of this check is
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* to ensure that after eliminating all slots that do not pass this check, we
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* are left with a set of live services each with a unique label.
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*/
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static int
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service_active(index_t slot)
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{
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/*
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* Init is in RS's process tables as the representation of user
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* processes. It is not a system service.
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*/
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return ((rproc.proc[slot].r_flags & (RS_IN_USE | RS_ACTIVE)) ==
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(RS_IN_USE | RS_ACTIVE) &&
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rproc.pub[slot].endpoint != INIT_PROC_NR);
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}
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/*
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* Update the contents of the service directory, by first updating the RS
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* tables and then updating the directory contents.
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*/
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static void
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service_update(void)
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{
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struct inode *node;
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struct inode_stat stat;
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index_t slot;
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static int warned = FALSE;
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int r;
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/* There is not much we can do if this call fails. */
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r = getsysinfo(RS_PROC_NR, SI_PROCALL_TAB, &rproc, sizeof(rproc));
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if (r != OK && !warned) {
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printf("PROCFS: unable to obtain RS tables (%d)\n", r);
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warned = TRUE;
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}
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/*
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* As with PIDs, we make two passes. Delete first, then add. This
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* prevents problems in the hypothetical case that between updates, one
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* slot ends up with the label name of a previous, different slot.
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*/
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for (slot = 0; slot < NR_SYS_PROCS; slot++) {
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if ((node = get_inode_by_index(service_node, slot)) == NULL)
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continue;
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/*
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* If the slot is no longer in use, or the label name does not
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* match, the node must be deleted.
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*/
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if (!service_active(slot) ||
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strcmp(get_inode_name(node), rproc.pub[slot].label))
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delete_inode(node);
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}
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memset(&stat, 0, sizeof(stat));
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stat.mode = REG_ALL_MODE;
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stat.uid = SUPER_USER;
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stat.gid = SUPER_USER;
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for (slot = 0; slot < NR_SYS_PROCS; slot++) {
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if (!service_active(slot) ||
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get_inode_by_index(service_node, slot) != NULL)
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continue;
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node = add_inode(service_node, rproc.pub[slot].label, slot,
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&stat, (index_t)0, (cbdata_t)slot);
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if (node == NULL)
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out_of_inodes();
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}
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}
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/*
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* Initialize the service directory.
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*/
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void
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service_init(void)
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{
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struct inode *root, *node;
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struct inode_stat stat;
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root = get_root_inode();
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memset(&stat, 0, sizeof(stat));
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stat.mode = DIR_ALL_MODE;
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stat.uid = SUPER_USER;
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stat.gid = SUPER_USER;
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service_node = add_inode(root, "service", NO_INDEX, &stat,
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NR_SYS_PROCS, NULL);
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if (service_node == NULL)
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panic("unable to create service node");
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}
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/*
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* A lookup request is being performed. If it is in the service directory,
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* update the tables. We do this lazily, to reduce overhead.
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*/
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void
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service_lookup(struct inode * parent, clock_t now)
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{
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static clock_t last_update = 0;
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if (parent != service_node)
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return;
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if (last_update != now) {
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service_update();
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last_update = now;
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}
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}
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/*
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* A getdents request is being performed. If it is in the service directory,
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* update the tables.
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*/
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void
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service_getdents(struct inode * node)
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{
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if (node != service_node)
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return;
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service_update();
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}
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/*
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* A read request is being performed. If it is on a file in the service
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* directory, process the read request. We rely on the fact that any read
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* call will have been preceded by a lookup, so its table entry has been
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* updated very recently.
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*/
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void
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service_read(struct inode * node)
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{
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struct inode *parent;
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index_t slot;
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struct rprocpub *rpub;
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struct rproc *rp;
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if (get_parent_inode(node) != service_node)
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return;
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slot = get_inode_index(node);
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rpub = &rproc.pub[slot];
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rp = &rproc.proc[slot];
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/* TODO: add a large number of other fields! */
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buf_printf("filename: %s\n", rpub->proc_name);
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buf_printf("endpoint: %d\n", rpub->endpoint);
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buf_printf("pid: %d\n", rp->r_pid);
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buf_printf("restarts: %d\n", rp->r_restarts);
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buf_printf("flags: %s\n", service_get_flags(slot));
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buf_printf("policies: %s\n", service_get_policies(policies, slot));
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buf_printf("ASRcount: %u\n", rp->r_asr_count);
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}
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