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libisofs/src/libiso_msgs.c

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/* libiso_msgs
Message handling facility of libiso.
Copyright (C) 2006 Thomas Schmitt <scdbackup@gmx.net>, provided under GPL
*/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/time.h>
/* Only this single source module is entitled to do this */
#define LIBISO_MSGS_H_INTERNAL 1
/* All participants in the messaging system must do this */
#include "libiso_msgs.h"
/* ----------------------------- libiso_msgs_item ------------------------- */
static int libiso_msgs_item_new(struct libiso_msgs_item **item,
struct libiso_msgs_item *link, int flag)
{
int ret;
struct libiso_msgs_item *o;
struct timeval tv;
struct timezone tz;
(*item)= o=
(struct libiso_msgs_item *) malloc(sizeof(struct libiso_msgs_item));
if(o==NULL)
return(-1);
o->timestamp= 0.0;
ret= gettimeofday(&tv,&tz);
if(ret==0)
o->timestamp= tv.tv_sec+0.000001*tv.tv_usec;
o->process_id= getpid();
o->driveno= -1;
o->severity= LIBISO_MSGS_SEV_ALL;
o->priority= LIBISO_MSGS_PRIO_ZERO;
o->error_code= 0;
o->msg_text= NULL;
o->os_errno= 0;
o->prev= link;
o->next= NULL;
if(link!=NULL) {
if(link->next!=NULL) {
link->next->prev= o;
o->next= link->next;
}
link->next= o;
}
return(1);
}
/** Detaches item from its queue and eventually readjusts start, end pointers
of the queue */
int libiso_msgs_item_unlink(struct libiso_msgs_item *o,
struct libiso_msgs_item **chain_start,
struct libiso_msgs_item **chain_end, int flag)
{
if(o->prev!=NULL)
o->prev->next= o->next;
if(o->next!=NULL)
o->next->prev= o->prev;
if(chain_start!=NULL)
if(*chain_start == o)
*chain_start= o->next;
if(chain_end!=NULL)
if(*chain_end == o)
*chain_end= o->prev;
o->next= o->prev= NULL;
return(1);
}
int libiso_msgs_item_destroy(struct libiso_msgs_item **item,
int flag)
{
struct libiso_msgs_item *o;
o= *item;
if(o==NULL)
return(0);
libiso_msgs_item_unlink(o,NULL,NULL,0);
if(o->msg_text!=NULL)
free((char *) o->msg_text);
free((char *) o);
*item= NULL;
return(1);
}
int libiso_msgs_item_get_msg(struct libiso_msgs_item *item,
int *error_code, char **msg_text, int *os_errno,
int flag)
{
*error_code= item->error_code;
*msg_text= item->msg_text;
*os_errno= item->os_errno;
return(1);
}
int libiso_msgs_item_get_origin(struct libiso_msgs_item *item,
double *timestamp, pid_t *process_id, int *driveno,
int flag)
{
*timestamp= item->timestamp;
*process_id= item->process_id;
*driveno= item->driveno;
return(1);
}
int libiso_msgs_item_get_rank(struct libiso_msgs_item *item,
int *severity, int *priority, int flag)
{
*severity= item->severity;
*priority= item->priority;
return(1);
}
/* ------------------------------- libiso_msgs ---------------------------- */
int libiso_msgs_new(struct libiso_msgs **m, int flag)
{
struct libiso_msgs *o;
(*m)= o= (struct libiso_msgs *) malloc(sizeof(struct libiso_msgs));
if(o==NULL)
return(-1);
o->oldest= NULL;
o->youngest= NULL;
o->count= 0;
o->queue_severity= LIBISO_MSGS_SEV_ALL;
o->print_severity= LIBISO_MSGS_SEV_NEVER;
strcpy(o->print_id,"libiso: ");
#ifndef LIBISO_MSGS_SINGLE_THREADED
pthread_mutex_init(&(o->lock_mutex),NULL);
#endif
return(1);
}
int libiso_msgs_destroy(struct libiso_msgs **m, int flag)
{
struct libiso_msgs *o;
struct libiso_msgs_item *item, *next_item;
o= *m;
if(o==NULL)
return(0);
#ifndef LIBISO_MSGS_SINGLE_THREADED
if(pthread_mutex_destroy(&(o->lock_mutex))!=0) {
pthread_mutex_unlock(&(o->lock_mutex));
pthread_mutex_destroy(&(o->lock_mutex));
}
#endif
for(item= o->oldest; item!=NULL; item= next_item) {
next_item= item->next;
libiso_msgs_item_destroy(&item,0);
}
free((char *) o);
*m= NULL;
return(1);
}
int libiso_msgs_set_severities(struct libiso_msgs *m, int queue_severity,
int print_severity, const char *print_id, int flag)
{
m->queue_severity= queue_severity;
m->print_severity= print_severity;
strncpy(m->print_id,print_id,80);
m->print_id[80]= 0;
return(1);
}
static int libiso_msgs_lock(struct libiso_msgs *m, int flag)
{
#ifndef LIBISO_MSGS_SINGLE_THREADED
int ret;
ret= pthread_mutex_lock(&(m->lock_mutex));
if(ret!=0)
return(0);
#endif
return(1);
}
static int libiso_msgs_unlock(struct libiso_msgs *m, int flag)
{
#ifndef LIBISO_MSGS_SINGLE_THREADED
int ret;
ret= pthread_mutex_unlock(&(m->lock_mutex));
if(ret!=0)
return(0);
#endif
return(1);
}
int libiso_msgs__text_to_sev(char *severity_name, int *severity,
int flag)
{
if(strncmp(severity_name,"NEVER",5)==0)
*severity= LIBISO_MSGS_SEV_NEVER;
else if(strncmp(severity_name,"ABORT",5)==0)
*severity= LIBISO_MSGS_SEV_ABORT;
else if(strncmp(severity_name,"FATAL",5)==0)
*severity= LIBISO_MSGS_SEV_FATAL;
else if(strncmp(severity_name,"SORRY",5)==0)
*severity= LIBISO_MSGS_SEV_SORRY;
else if(strncmp(severity_name,"WARNING",7)==0)
*severity= LIBISO_MSGS_SEV_WARNING;
else if(strncmp(severity_name,"HINT",4)==0)
*severity= LIBISO_MSGS_SEV_HINT;
else if(strncmp(severity_name,"NOTE",4)==0)
*severity= LIBISO_MSGS_SEV_NOTE;
else if(strncmp(severity_name,"UPDATE",6)==0)
*severity= LIBISO_MSGS_SEV_UPDATE;
else if(strncmp(severity_name,"DEBUG",5)==0)
*severity= LIBISO_MSGS_SEV_DEBUG;
else if(strncmp(severity_name,"ALL",3)==0)
*severity= LIBISO_MSGS_SEV_ALL;
else {
*severity= LIBISO_MSGS_SEV_NEVER;
return(0);
}
return(1);
}
int libiso_msgs__sev_to_text(int severity, char **severity_name,
int flag)
{
if(flag&1) {
*severity_name=
"NEVER\nABORT\nFATAL\nSORRY\nWARNING\nHINT\nNOTE\nUPDATE\nDEBUG\nALL";
return(1);
}
*severity_name= "";
if(severity>=LIBISO_MSGS_SEV_NEVER)
*severity_name= "NEVER";
else if(severity>=LIBISO_MSGS_SEV_ABORT)
*severity_name= "ABORT";
else if(severity>=LIBISO_MSGS_SEV_FATAL)
*severity_name= "FATAL";
else if(severity>=LIBISO_MSGS_SEV_SORRY)
*severity_name= "SORRY";
else if(severity>=LIBISO_MSGS_SEV_WARNING)
*severity_name= "WARNING";
else if(severity>=LIBISO_MSGS_SEV_HINT)
*severity_name= "HINT";
else if(severity>=LIBISO_MSGS_SEV_NOTE)
*severity_name= "NOTE";
else if(severity>=LIBISO_MSGS_SEV_UPDATE)
*severity_name= "UPDATE";
else if(severity>=LIBISO_MSGS_SEV_DEBUG)
*severity_name= "DEBUG";
else if(severity>=LIBISO_MSGS_SEV_ALL)
*severity_name= "ALL";
else {
*severity_name= "";
return(0);
}
return(1);
}
int libiso_msgs_submit(struct libiso_msgs *m, int driveno, int error_code,
int severity, int priority, char *msg_text,
int os_errno, int flag)
{
int ret;
char *textpt,*sev_name,sev_text[81];
struct libiso_msgs_item *item= NULL;
if(severity >= m->print_severity) {
if(msg_text==NULL)
textpt= "";
else
textpt= msg_text;
sev_text[0]= 0;
ret= libiso_msgs__sev_to_text(severity,&sev_name,0);
if(ret>0)
sprintf(sev_text,"%s : ",sev_name);
fprintf(stderr,"%s%s%s\n",m->print_id,sev_text,textpt);
if(os_errno!=0) {
ret= libiso_msgs_lock(m,0);
if(ret<=0)
return(-1);
fprintf(stderr,"%s( Most recent system error: %d '%s' )\n",
m->print_id,os_errno,strerror(os_errno));
libiso_msgs_unlock(m,0);
}
}
if(severity < m->queue_severity)
return(0);
ret= libiso_msgs_lock(m,0);
if(ret<=0)
return(-1);
ret= libiso_msgs_item_new(&item,m->youngest,0);
if(ret<=0)
goto failed;
item->driveno= driveno;
item->error_code= error_code;
item->severity= severity;
item->priority= priority;
if(msg_text!=NULL) {
item->msg_text= malloc(strlen(msg_text)+1);
if(item->msg_text==NULL)
goto failed;
strcpy(item->msg_text,msg_text);
}
item->os_errno= os_errno;
if(m->oldest==NULL)
m->oldest= item;
m->youngest= item;
m->count++;
libiso_msgs_unlock(m,0);
/*
fprintf(stderr,"libiso_experimental: message submitted to queue (now %d)\n",
m->count);
*/
return(1);
failed:;
libiso_msgs_item_destroy(&item,0);
libiso_msgs_unlock(m,0);
return(-1);
}
int libiso_msgs_obtain(struct libiso_msgs *m, struct libiso_msgs_item **item,
int severity, int priority, int flag)
{
int ret;
struct libiso_msgs_item *im, *next_im= NULL;
*item= NULL;
ret= libiso_msgs_lock(m,0);
if(ret<=0)
return(-1);
for(im= m->oldest; im!=NULL; im= next_im) {
for(; im!=NULL; im= next_im) {
next_im= im->next;
if(im->severity>=severity)
break;
libiso_msgs_item_unlink(im,&(m->oldest),&(m->youngest),0);
libiso_msgs_item_destroy(&im,0); /* severity too low: delete */
}
if(im==NULL)
break;
if(im->priority>=priority)
break;
}
if(im==NULL)
{ret= 0; goto ex;}
libiso_msgs_item_unlink(im,&(m->oldest),&(m->youngest),0);
*item= im;
ret= 1;
ex:;
libiso_msgs_unlock(m,0);
return(ret);
}
int libiso_msgs_destroy_item(struct libiso_msgs *m,
struct libiso_msgs_item **item, int flag)
{
int ret;
ret= libiso_msgs_lock(m,0);
if(ret<=0)
return(-1);
ret= libiso_msgs_item_destroy(item,0);
libiso_msgs_unlock(m,0);
return(ret);
}
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