cb176df60f
UPDATING INFO: 20100317: /usr/src/etc/system.conf updated to ignore default kernel calls: copy it (or merge it) to /etc/system.conf. The hello driver (/dev/hello) added to the distribution: # cd /usr/src/commands/scripts && make clean install # cd /dev && MAKEDEV hello KERNEL CHANGES: - Generic signal handling support. The kernel no longer assumes PM as a signal manager for every process. The signal manager of a given process can now be specified in its privilege slot. When a signal has to be delivered, the kernel performs the lookup and forwards the signal to the appropriate signal manager. PM is the default signal manager for user processes, RS is the default signal manager for system processes. To enable ptrace()ing for system processes, it is sufficient to change the default signal manager to PM. This will temporarily disable crash recovery, though. - sys_exit() is now split into sys_exit() (i.e. exit() for system processes, which generates a self-termination signal), and sys_clear() (i.e. used by PM to ask the kernel to clear a process slot when a process exits). - Added a new kernel call (i.e. sys_update()) to swap two process slots and implement live update. PM CHANGES: - Posix signal handling is no longer allowed for system processes. System signals are split into two fixed categories: termination and non-termination signals. When a non-termination signaled is processed, PM transforms the signal into an IPC message and delivers the message to the system process. When a termination signal is processed, PM terminates the process. - PM no longer assumes itself as the signal manager for system processes. It now makes sure that every system signal goes through the kernel before being actually processes. The kernel will then dispatch the signal to the appropriate signal manager which may or may not be PM. SYSLIB CHANGES: - Simplified SEF init and LU callbacks. - Added additional predefined SEF callbacks to debug crash recovery and live update. - Fixed a temporary ack in the SEF init protocol. SEF init reply is now completely synchronous. - Added SEF signal event type to provide a uniform interface for system processes to deal with signals. A sef_cb_signal_handler() callback is available for system processes to handle every received signal. A sef_cb_signal_manager() callback is used by signal managers to process system signals on behalf of the kernel. - Fixed a few bugs with memory mapping and DS. VM CHANGES: - Page faults and memory requests coming from the kernel are now implemented using signals. - Added a new VM call to swap two process slots and implement live update. - The call is used by RS at update time and in turn invokes the kernel call sys_update(). RS CHANGES: - RS has been reworked with a better functional decomposition. - Better kernel call masks. com.h now defines the set of very basic kernel calls every system service is allowed to use. This makes system.conf simpler and easier to maintain. In addition, this guarantees a higher level of isolation for system libraries that use one or more kernel calls internally (e.g. printf). - RS is the default signal manager for system processes. By default, RS intercepts every signal delivered to every system process. This makes crash recovery possible before bringing PM and friends in the loop. - RS now supports fast rollback when something goes wrong while initializing the new version during a live update. - Live update is now implemented by keeping the two versions side-by-side and swapping the process slots when the old version is ready to update. - Crash recovery is now implemented by keeping the two versions side-by-side and cleaning up the old version only when the recovery process is complete. DS CHANGES: - Fixed a bug when the process doing ds_publish() or ds_delete() is not known by DS. - Fixed the completely broken support for strings. String publishing is now implemented in the system library and simply wraps publishing of memory ranges. Ideally, we should adopt a similar approach for other data types as well. - Test suite fixed. DRIVER CHANGES: - The hello driver has been added to the Minix distribution to demonstrate basic live update and crash recovery functionalities. - Other drivers have been adapted to conform the new SEF interface.
232 lines
6.7 KiB
C
232 lines
6.7 KiB
C
#include "syslib.h"
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#include <assert.h>
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#include <minix/sysutil.h>
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#include <stdio.h>
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/* Self variables. */
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#define SEF_SELF_NAME_MAXLEN 20
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PUBLIC char sef_self_name[SEF_SELF_NAME_MAXLEN];
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PUBLIC endpoint_t sef_self_endpoint;
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/* Debug. */
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#define SEF_DEBUG_HEADER_MAXLEN 32
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PRIVATE time_t sef_debug_boottime = 0;
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PRIVATE u32_t sef_debug_system_hz = 0;
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PRIVATE time_t sef_debug_time_sec = 0;
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PRIVATE time_t sef_debug_time_us = 0;
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PRIVATE char sef_debug_header_buff[SEF_DEBUG_HEADER_MAXLEN];
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FORWARD _PROTOTYPE( void sef_debug_refresh_params, (void) );
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PUBLIC _PROTOTYPE( char* sef_debug_header, (void) );
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/* SEF Init prototypes. */
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EXTERN _PROTOTYPE( int do_sef_rs_init, (void) );
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EXTERN _PROTOTYPE( int do_sef_init_request, (message *m_ptr) );
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/* SEF Ping prototypes. */
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EXTERN _PROTOTYPE( int do_sef_ping_request, (message *m_ptr) );
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/* SEF Live update prototypes. */
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EXTERN _PROTOTYPE( void do_sef_lu_before_receive, (void) );
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EXTERN _PROTOTYPE( int do_sef_lu_request, (message *m_ptr) );
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/* SEF Signal prototypes. */
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EXTERN _PROTOTYPE( int do_sef_signal_request, (message *m_ptr) );
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/*===========================================================================*
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* sef_startup *
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*===========================================================================*/
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PUBLIC void sef_startup()
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{
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/* SEF startup interface for system services. */
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int r;
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/* Get information about self. */
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r = sys_whoami(&sef_self_endpoint, sef_self_name, SEF_SELF_NAME_MAXLEN);
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if ( r != OK) {
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sef_self_endpoint = SELF;
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sprintf(sef_self_name, "%s", "Unknown");
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}
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#if INTERCEPT_SEF_INIT_REQUESTS
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/* Intercept SEF Init requests. */
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if(sef_self_endpoint == RS_PROC_NR) {
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if((r = do_sef_rs_init()) != OK) {
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panic("unable to complete init: %d", r);
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}
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}
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else {
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message m;
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if((r = receive(RS_PROC_NR, &m)) != OK) {
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panic("unable to receive from RS: %d", r);
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}
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if(IS_SEF_INIT_REQUEST(&m)) {
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if((r = do_sef_init_request(&m)) != OK) {
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panic("unable to process init request: %d", r);
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}
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}
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else {
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panic("got an unexpected message type %d", m.m_type);
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}
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}
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#endif
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}
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/*===========================================================================*
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* sef_receive *
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*===========================================================================*/
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PUBLIC int sef_receive(endpoint_t src, message *m_ptr)
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{
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/* SEF receive() interface for system services. */
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int r;
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while(TRUE) {
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#if INTERCEPT_SEF_LU_REQUESTS
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/* Handle SEF Live update before receive events. */
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do_sef_lu_before_receive();
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#endif
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/* Receive and return in case of error. */
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r = receive(src, m_ptr);
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if(r != OK) {
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return r;
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}
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#if INTERCEPT_SEF_PING_REQUESTS
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/* Intercept SEF Ping requests. */
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if(IS_SEF_PING_REQUEST(m_ptr)) {
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if(do_sef_ping_request(m_ptr) == OK) {
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continue;
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}
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}
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#endif
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#if INTERCEPT_SEF_LU_REQUESTS
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/* Intercept SEF Live update requests. */
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if(IS_SEF_LU_REQUEST(m_ptr)) {
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if(do_sef_lu_request(m_ptr) == OK) {
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continue;
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}
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}
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#endif
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#if INTERCEPT_SEF_SIGNAL_REQUESTS
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/* Intercept SEF Signal requests. */
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if(IS_SEF_SIGNAL_REQUEST(m_ptr)) {
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if(do_sef_signal_request(m_ptr) == OK) {
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continue;
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}
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}
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#endif
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/* If we get this far, this is not a valid SEF request, return and
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* let the caller deal with that.
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*/
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break;
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}
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return r;
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}
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/*===========================================================================*
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* sef_exit *
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*===========================================================================*/
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PUBLIC void sef_exit(int status)
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{
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/* System services use a special version of exit() that generates a
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* self-termination signal.
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*/
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message m;
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/* Ask the kernel to exit. */
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sys_exit();
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/* If sys_exit() fails, this is not a system service. Exit through PM. */
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m.m1_i1 = status;
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_syscall(PM_PROC_NR, EXIT, &m);
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/* If everything else fails, hang. */
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printf("Warning: system service %d couldn't exit\n", sef_self_endpoint);
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for(;;) { }
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}
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/*===========================================================================*
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* _exit *
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*===========================================================================*/
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PUBLIC void _exit(int status)
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{
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/* Make exit() an alias for sef_exit() for system services. */
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sef_exit(status);
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}
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/*===========================================================================*
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* __exit *
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*===========================================================================*/
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PUBLIC void __exit(int status)
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{
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/* Make exit() an alias for sef_exit() for system services. */
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sef_exit(status);
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}
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/*===========================================================================*
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* sef_debug_refresh_params *
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*===========================================================================*/
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PRIVATE void sef_debug_refresh_params(void)
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{
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/* Refresh SEF debug params. */
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clock_t uptime;
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int r;
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/* Get boottime the first time. */
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if(!sef_debug_boottime) {
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r = sys_times(NONE, NULL, NULL, NULL, &sef_debug_boottime);
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if ( r != OK) {
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sef_debug_boottime = -1;
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}
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}
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/* Get system hz the first time. */
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if(!sef_debug_system_hz) {
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r = sys_getinfo(GET_HZ, &sef_debug_system_hz,
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sizeof(sef_debug_system_hz), 0, 0);
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if ( r != OK) {
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sef_debug_system_hz = -1;
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}
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}
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/* Get uptime. */
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uptime = -1;
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if(sef_debug_boottime!=-1 && sef_debug_system_hz!=-1) {
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r = sys_times(NONE, NULL, NULL, &uptime, NULL);
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if ( r != OK) {
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uptime = -1;
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}
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}
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/* Compute current time. */
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if(sef_debug_boottime==-1 || sef_debug_system_hz==-1 || uptime==-1) {
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sef_debug_time_sec = 0;
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sef_debug_time_us = 0;
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}
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else {
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sef_debug_time_sec = (time_t) (sef_debug_boottime
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+ (uptime/sef_debug_system_hz));
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sef_debug_time_us = (uptime%sef_debug_system_hz)
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* 1000000/sef_debug_system_hz;
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}
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}
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/*===========================================================================*
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* sef_debug_header *
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*===========================================================================*/
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PUBLIC char* sef_debug_header(void)
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{
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/* Build and return a SEF debug header. */
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sef_debug_refresh_params();
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sprintf(sef_debug_header_buff, "%s: time = %ds %06dus",
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sef_self_name, (int) sef_debug_time_sec, (int) sef_debug_time_us);
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return sef_debug_header_buff;
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}
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