Examples

#pragma linkage(BPX1PCT, OS)
extern void BPX1PCT(char *, int, int, char *, int *, int *, int *);

/* #include <stdlib.h>  */
#include <stdio.h>

#define ZFSCALL_STATS    0x40000007
#define STATOP_LOG_CACHE                 247  /* Performance API queries */

#define u_long unsigned long

#define CONVERT_RATIO_TO_INTS(RATIO, INTEGER, DECIMAL)             \
{                                                                  \
  INTEGER = (int)RATIO;                                            \
  DECIMAL = (int)((RATIO - (double)INTEGER) * (double)1000.0);     \
}

typedef struct syscall_parmlist_t
{
    int opcode;               /* Operation code to perform             */
    int parms[7];             /* Specific to type of operation,        */
                              /* provides access to the parms          */
                              /* parms[4]-parms[6] are currently unused*/
} syscall_parmlist;

typedef struct hyper {
  unsigned long high;              /* unsigned long reserved */
  unsigned long low;
} hyper;
typedef struct API_LOG_STATS_t  {
  char     al_eye[4];          /* Eye catcher = ALOG */
#define LS_EYE "ALOG"
  short    al_size;            /* Size of output structure */
  char     al_version;         /* Version of stats */
#define LS_VER_INITIAL 1       /* First version of log stats */
  char     al_reserved1;       /* Reserved byte, 0 in version 1 */
  hyper    al_buffers;         /* Number of buffers used */
  int      al_reserved2;       /* Reserved for future use, 0 in version 1 */
  int      al_buffsize;        /* Size in kilobytes of one buffer */
  hyper    al_lookups;         /* Lookups/creates of item in log buffer cache */
  hyper    al_hits;            /* Hits, number of times item found in cache */
  hyper    al_writtenPages;    /* Number of log buffer pages written to disk */
  hyper    al_fullWaits;       /* Number of time new log buffer requires wait on prior log pages */
  hyper    al_nbsWaits;        /* Number of time new log buffer requires wait on new block user IO */
  int      al_reserved3[10];   /* Reserved for future use */
} API_LOG_STATS;

/* reset timestamp */
typedef  struct  reset_time {
  u_long   posix_time_high;   /* high order 32 bits since epoc */
  u_long   posix_time_low;    /* low order 32 bits since epoch */
  u_long   posix_usecs;        /* microseconds */
  int      pad1;
 } RESET_TIME;

/*********************************************************************/
/* The following structure is the api query control block            */
/* It is used for all api query commands                             */
/*********************************************************************/

typedef struct stat_api_t
{
#define SA_EYE    "STAP"
    char  sa_eye[4];     /* 4 byte identifier must be */
    int   sa_len;        /* length of the buffer to put data into*/
                         /* this buffer area follows this struct*/
    int   sa_ver;        /* the version number currently always 1*/
#define SA_VER_INITIAL 0x01
    char  sa_flags;      /* flags field  must be x00 or x80, x80 means reset statistics*/
#define SA_RESET 0x80
    char  sa_fill[3];    /* spare bytes */
    int   sa_reserve[4];       /* Reserved */
    struct reset_time reset_time_info;
} STAT_API;

struct parmstruct
{
    syscall_parmlist myparms;
    STAT_API myapi;
    API_LOG_STATS mystats;
    char systemname[9];
} myparmstruct;

int main(int argc, char **argv)
{
    int bpxrv;
    int bpxrc;
    int bpxrs;
    int i;
    double temp_ratio;
    int whole,decimal;

    STAT_API *stapptr = &(myparmstruct.myapi);
 /*   STAT_TRAN_CACHE *sttcptr = &(myparmstruct.mystats);   */
    char buf[33];

    myparmstruct.myparms.opcode = STATOP_LOG_CACHE;
    myparmstruct.myparms.parms[0] = sizeof(syscall_parmlist);
    myparmstruct.myparms.parms[1] = sizeof(syscall_parmlist) + sizeof(STAT_API);
    myparmstruct.myparms.parms[2] = 0;

/* Only specify a non-zero offset for the next field (parms[2]) if */
/* you are running z/OS 1.7 and above, and */
/* you want to query the log cache statistics of a different system than this one */

/* myparmstruct.myparms.parms[2] = sizeof(syscall_parmlist) + sizeof(STAT_API) + sizeof(API_LOG_STATS); */

    myparmstruct.myparms.parms[3] = 0;
    myparmstruct.myparms.parms[4] = 0;
    myparmstruct.myparms.parms[5] = 0;
    myparmstruct.myparms.parms[6] = 0;

    memset(stapptr,0,sizeof(STAT_API));
    memcpy(stapptr->sa_eye,SA_EYE,4);
    stapptr->sa_ver=SA_VER_INITIAL;
    stapptr->sa_len=(int) sizeof(API_LOG_STATS);

/* This next field should only be set if parms[2] is non-zero */
/* strcpy(myparmstruct.systemname,"DCEIMGVQ"); */

    BPX1PCT("ZFS     ",
            ZFSCALL_STATS,            /* Perf statistics operation        */
            sizeof(myparmstruct),     /* Length of Argument      */
            (char *) &myparmstruct,   /* Pointer to Argument     */
            &bpxrv,                   /* Pointer to Return_value */
            &bpxrc,                   /* Pointer to Return_code  */
            &bpxrs);                  /* Pointer to Reason_code  */
    if( bpxrv < 0 )
    {
        printf("Error querying log cache, BPXRV = %d BPXRC = %d BPXRS = %x\n",bpxrv,bpxrc,bpxrs);
        return bpxrc;
    }
    else
    {
        printf("%52s\n","Log File Caching Statistics");
        printf("      \n");
        printf("Buffers    (K bytes)  Requests     Hits    Ratio   Written \n");
        printf("---------- --------- ---------- ---------- ------ ----------\n");

        temp_ratio = (myparmstruct.mystats.al_lookups.low == 0) ? 0.0 :
            ((double)myparmstruct.mystats.al_hits.low)/myparmstruct.mystats.al_lookups.low;
        temp_ratio *= 100.0;
        CONVERT_RATIO_TO_INTS(temp_ratio,whole, decimal);
        decimal = decimal / 100;   /* Just want tenths */

        printf("%10u %9u %10u %10u %3u.%1.1u%% %10u\n",
               myparmstruct.mystats.al_buffers.low,
               myparmstruct.mystats.al_buffers.low * myparmstruct.mystats.al_buffsize,
               myparmstruct.mystats.al_lookups.low, myparmstruct.mystats.al_hits.low,
               whole, decimal, myparmstruct.mystats.al_writtenPages.low);
        printf("  \n");
        printf("New buffer: log full waits %10u  NBS IO waits %10u\n",
               myparmstruct.mystats.al_fullWaits.low, myparmstruct.mystats.al_nbsWaits.low);
        printf("  \n");

        if (0==ctime_r((time_t *) &stapptr->reset_time_info.posix_time_low, buf))
        {
            printf("Could not get timestamp.\n");
        }
        else
        {   /* Insert the microseconds into the displayable time value */
            strncpy(&(buf[27]),&(buf[20]),6);
            sprintf(&(buf[20]),"%06d",stapptr->reset_time_info.posix_usecs);
            buf[26]=' ';
            buf[19]='.';
            printf("Last Reset Time: %s",buf);
        }
    }
    return 0;
}