060399d9dd
This function allows the caller to cancel receiving a message from a SEF callback. The receive function will then return EINTR.
310 lines
9.4 KiB
C
310 lines
9.4 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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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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/* Self variables. */
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#define SEF_SELF_NAME_MAXLEN 20
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char sef_self_name[SEF_SELF_NAME_MAXLEN];
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endpoint_t sef_self_endpoint;
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int sef_self_priv_flags;
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int sef_self_first_receive_done;
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int sef_self_receiving;
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/* Debug. */
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#if SEF_INIT_DEBUG || SEF_LU_DEBUG || SEF_PING_DEBUG || SEF_SIGNAL_DEBUG
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#define SEF_DEBUG_HEADER_MAXLEN 32
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static time_t sef_debug_boottime = 0;
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static u32_t sef_debug_system_hz = 0;
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static time_t sef_debug_time_sec = 0;
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static time_t sef_debug_time_us = 0;
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static char sef_debug_header_buff[SEF_DEBUG_HEADER_MAXLEN];
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static void sef_debug_refresh_params(void);
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char* sef_debug_header(void);
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#endif
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/* SEF Init prototypes. */
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#ifdef USE_COVERAGE
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EXTERN int do_sef_gcov_request(message *m_ptr);
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#endif
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EXTERN int do_sef_rs_init(endpoint_t old_endpoint);
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EXTERN int do_sef_init_request(message *m_ptr);
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/* SEF Ping prototypes. */
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EXTERN int do_sef_ping_request(message *m_ptr);
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/* SEF Live update prototypes. */
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EXTERN void do_sef_lu_before_receive(void);
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EXTERN int do_sef_lu_request(message *m_ptr);
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/* SEF Signal prototypes. */
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EXTERN 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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void sef_startup()
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{
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/* SEF startup interface for system services. */
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int r, status;
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endpoint_t old_endpoint;
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int priv_flags;
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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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&priv_flags);
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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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sef_self_priv_flags = priv_flags;
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old_endpoint = NONE;
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#if USE_LIVEUPDATE
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/* RS may wake up with the wrong endpoint, perfom the update in that case. */
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if((sef_self_priv_flags & ROOT_SYS_PROC) && sef_self_endpoint != RS_PROC_NR) {
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r = vm_update(RS_PROC_NR, sef_self_endpoint);
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if(r != OK) {
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panic("unable to update RS from instance %d to %d",
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RS_PROC_NR, sef_self_endpoint);
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}
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old_endpoint = sef_self_endpoint;
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sef_self_endpoint = RS_PROC_NR;
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}
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#endif /* USE_LIVEUPDATE */
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#if INTERCEPT_SEF_INIT_REQUESTS
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/* Intercept SEF Init requests. */
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if(sef_self_priv_flags & ROOT_SYS_PROC) {
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/* RS initialization is special. */
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if((r = do_sef_rs_init(old_endpoint)) != OK) {
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panic("RS 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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/* Wait for an initialization message from RS. We need this to learn the
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* initialization type and parameters. When restarting after a crash, we
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* may get some spurious IPC messages from RS (e.g. update request) that
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* were originally meant to be delivered to the old instance. We discard
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* these messages and block till a proper initialization request arrives.
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*/
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do {
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r = receive(RS_PROC_NR, &m, &status);
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if(r != OK) {
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panic("unable to receive from RS: %d", r);
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}
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} while(!IS_SEF_INIT_REQUEST(&m));
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/* Process initialization request for this system service. */
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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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#endif
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/* (Re)initialize SEF variables. */
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sef_self_first_receive_done = FALSE;
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sef_self_priv_flags = priv_flags;
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}
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/*===========================================================================*
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* sef_receive_status *
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*===========================================================================*/
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int sef_receive_status(endpoint_t src, message *m_ptr, int *status_ptr)
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{
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/* SEF receive() interface for system services. */
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int r, status;
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sef_self_receiving = TRUE;
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while(TRUE) {
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/* If the caller indicated that it no longer wants to receive a message,
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* return now.
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*/
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if (!sef_self_receiving)
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return EINTR;
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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, &status);
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if(status_ptr) *status_ptr = status;
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if(!sef_self_first_receive_done) sef_self_first_receive_done = TRUE;
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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, status)) {
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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, status)) {
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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, status)) {
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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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#ifdef USE_COVERAGE
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/* Intercept GCOV data requests (sent by VFS in vfs/gcov.c). */
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if(m_ptr->m_type == COMMON_REQ_GCOV_DATA &&
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m_ptr->m_source == VFS_PROC_NR) {
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if(do_sef_gcov_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_cancel *
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*===========================================================================*/
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void sef_cancel(void)
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{
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/* Cancel receiving a message. This function be called from a callback invoked
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* from within sef_receive_status(), which will then return an EINTR error
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* code. In particular, this function can be used to exit from the main receive
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* loop when a signal handler causes the process to want to shut down.
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*/
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sef_self_receiving = FALSE;
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}
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/*===========================================================================*
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* sef_exit *
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*===========================================================================*/
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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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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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panic("sef_exit failed");
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}
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/*===========================================================================*
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* __exit *
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*===========================================================================*/
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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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panic("sef_exit failed");
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}
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#if SEF_INIT_DEBUG || SEF_LU_DEBUG || SEF_PING_DEBUG || SEF_SIGNAL_DEBUG
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/*===========================================================================*
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* sef_debug_refresh_params *
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*===========================================================================*/
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static 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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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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#endif /*SEF_INIT_DEBUG || SEF_LU_DEBUG || SEF_PING_DEBUG || SEF_SIGNAL_DEBUG*/
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