darshan-logutils.c

/*
 *  (C) 2009 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#define _GNU_SOURCE
#include "darshan-util-config.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <zlib.h>
#ifdef HAVE_LIBBZ2
#include <bzlib.h>
#endif

#include "darshan-logutils.h"

struct darshan_fd_s
{
    gzFile gzf;
#ifdef HAVE_LIBBZ2
    BZFILE* bzf;
#endif
    int64_t pos;
    char mode[2];
    int swap_flag;
    char version[10];
    int job_struct_size;
    char* name;
    int COMPAT_CP_EXE_LEN;
};

/* isn't there a clever c way to avoid this? */
char *darshan_names[] = {
    "CP_INDEP_OPENS",
    "CP_COLL_OPENS",               /* count of MPI collective opens */
    "CP_INDEP_READS",              /* count of independent MPI reads */
    "CP_INDEP_WRITES",             /* count of independent MPI writes */
    "CP_COLL_READS",               /* count of collective MPI reads */
    "CP_COLL_WRITES",              /* count of collective MPI writes */
    "CP_SPLIT_READS",              /* count of split collective MPI reads */
    "CP_SPLIT_WRITES",             /* count of split collective MPI writes */
    "CP_NB_READS",                 /* count of nonblocking MPI reads */
    "CP_NB_WRITES",                /* count of nonblocking MPI writes */
    "CP_SYNCS",                    /* count of MPI_File_sync */
    "CP_POSIX_READS",              /* count of posix reads */
    "CP_POSIX_WRITES",             /* count of posix writes */
    "CP_POSIX_OPENS",              /* count of posix opens */
    "CP_POSIX_SEEKS",              /* count of posix seeks */
    "CP_POSIX_STATS",              /* count of posix stat/lstat/fstats */
    "CP_POSIX_MMAPS",              /* count of posix mmaps */
    "CP_POSIX_FREADS",
    "CP_POSIX_FWRITES",
    "CP_POSIX_FOPENS",
    "CP_POSIX_FSEEKS",
    "CP_POSIX_FSYNCS",
    "CP_POSIX_FDSYNCS",
    "CP_INDEP_NC_OPENS",
    "CP_COLL_NC_OPENS",
    "CP_HDF5_OPENS",
    "CP_COMBINER_NAMED",           /* count of each MPI datatype category */
    "CP_COMBINER_DUP",
    "CP_COMBINER_CONTIGUOUS",
    "CP_COMBINER_VECTOR",
    "CP_COMBINER_HVECTOR_INTEGER",
    "CP_COMBINER_HVECTOR",
    "CP_COMBINER_INDEXED",
    "CP_COMBINER_HINDEXED_INTEGER",
    "CP_COMBINER_HINDEXED",
    "CP_COMBINER_INDEXED_BLOCK",
    "CP_COMBINER_STRUCT_INTEGER",
    "CP_COMBINER_STRUCT",
    "CP_COMBINER_SUBARRAY",
    "CP_COMBINER_DARRAY",
    "CP_COMBINER_F90_REAL",
    "CP_COMBINER_F90_COMPLEX",
    "CP_COMBINER_F90_INTEGER",
    "CP_COMBINER_RESIZED",
    "CP_HINTS",                     /* count of MPI hints used */
    "CP_VIEWS",                     /* count of MPI set view calls */
    "CP_MODE",                      /* mode of file */
    "CP_BYTES_READ",                /* total bytes read */
    "CP_BYTES_WRITTEN",             /* total bytes written */
    "CP_MAX_BYTE_READ",             /* highest offset byte read */
    "CP_MAX_BYTE_WRITTEN",          /* highest offset byte written */
    "CP_CONSEC_READS",              /* count of consecutive reads */
    "CP_CONSEC_WRITES",             /* count of consecutive writes */
    "CP_SEQ_READS",                 /* count of sequential reads */
    "CP_SEQ_WRITES",                /* count of sequential writes */
    "CP_RW_SWITCHES",
    "CP_MEM_NOT_ALIGNED",           /* count of accesses not mem aligned */
    "CP_MEM_ALIGNMENT",             /* mem alignment in bytes */
    "CP_FILE_NOT_ALIGNED",          /* count of accesses not file aligned */
    "CP_FILE_ALIGNMENT",            /* file alignment in bytes */
    "CP_MAX_READ_TIME_SIZE",
    "CP_MAX_WRITE_TIME_SIZE",
    "CP_SIZE_READ_0_100",           /* count of posix read size ranges */
    "CP_SIZE_READ_100_1K",
    "CP_SIZE_READ_1K_10K",
    "CP_SIZE_READ_10K_100K",
    "CP_SIZE_READ_100K_1M",
    "CP_SIZE_READ_1M_4M",
    "CP_SIZE_READ_4M_10M",
    "CP_SIZE_READ_10M_100M",
    "CP_SIZE_READ_100M_1G",
    "CP_SIZE_READ_1G_PLUS",
    "CP_SIZE_WRITE_0_100",          /* count of posix write size ranges */
    "CP_SIZE_WRITE_100_1K",
    "CP_SIZE_WRITE_1K_10K",
    "CP_SIZE_WRITE_10K_100K",
    "CP_SIZE_WRITE_100K_1M",
    "CP_SIZE_WRITE_1M_4M",
    "CP_SIZE_WRITE_4M_10M",
    "CP_SIZE_WRITE_10M_100M",
    "CP_SIZE_WRITE_100M_1G",
    "CP_SIZE_WRITE_1G_PLUS",
    "CP_SIZE_READ_AGG_0_100",       /* count of MPI read size ranges */
    "CP_SIZE_READ_AGG_100_1K",
    "CP_SIZE_READ_AGG_1K_10K",
    "CP_SIZE_READ_AGG_10K_100K",
    "CP_SIZE_READ_AGG_100K_1M",
    "CP_SIZE_READ_AGG_1M_4M",
    "CP_SIZE_READ_AGG_4M_10M",
    "CP_SIZE_READ_AGG_10M_100M",
    "CP_SIZE_READ_AGG_100M_1G",
    "CP_SIZE_READ_AGG_1G_PLUS",
    "CP_SIZE_WRITE_AGG_0_100",      /* count of MPI write size ranges */
    "CP_SIZE_WRITE_AGG_100_1K",
    "CP_SIZE_WRITE_AGG_1K_10K",
    "CP_SIZE_WRITE_AGG_10K_100K",
    "CP_SIZE_WRITE_AGG_100K_1M",
    "CP_SIZE_WRITE_AGG_1M_4M",
    "CP_SIZE_WRITE_AGG_4M_10M",
    "CP_SIZE_WRITE_AGG_10M_100M",
    "CP_SIZE_WRITE_AGG_100M_1G",
    "CP_SIZE_WRITE_AGG_1G_PLUS",
    "CP_EXTENT_READ_0_100",          /* count of MPI read extent ranges */
    "CP_EXTENT_READ_100_1K",
    "CP_EXTENT_READ_1K_10K",
    "CP_EXTENT_READ_10K_100K",
    "CP_EXTENT_READ_100K_1M",
    "CP_EXTENT_READ_1M_4M",
    "CP_EXTENT_READ_4M_10M",
    "CP_EXTENT_READ_10M_100M",
    "CP_EXTENT_READ_100M_1G",
    "CP_EXTENT_READ_1G_PLUS",
    "CP_EXTENT_WRITE_0_100",         /* count of MPI write extent ranges */
    "CP_EXTENT_WRITE_100_1K",
    "CP_EXTENT_WRITE_1K_10K",
    "CP_EXTENT_WRITE_10K_100K",
    "CP_EXTENT_WRITE_100K_1M",
    "CP_EXTENT_WRITE_1M_4M",
    "CP_EXTENT_WRITE_4M_10M",
    "CP_EXTENT_WRITE_10M_100M",
    "CP_EXTENT_WRITE_100M_1G",
    "CP_EXTENT_WRITE_1G_PLUS",
    "CP_STRIDE1_STRIDE",             /* the four most frequently appearing strides */
    "CP_STRIDE2_STRIDE",
    "CP_STRIDE3_STRIDE",
    "CP_STRIDE4_STRIDE",
    "CP_STRIDE1_COUNT",              /* count of each of the most frequent strides */
    "CP_STRIDE2_COUNT",
    "CP_STRIDE3_COUNT",
    "CP_STRIDE4_COUNT",
    "CP_ACCESS1_ACCESS",
    "CP_ACCESS2_ACCESS",
    "CP_ACCESS3_ACCESS",
    "CP_ACCESS4_ACCESS",
    "CP_ACCESS1_COUNT",
    "CP_ACCESS2_COUNT",
    "CP_ACCESS3_COUNT",
    "CP_ACCESS4_COUNT",
    "CP_DEVICE",
    "CP_SIZE_AT_OPEN",
    "CP_FASTEST_RANK",
    "CP_FASTEST_RANK_BYTES",
    "CP_SLOWEST_RANK",
    "CP_SLOWEST_RANK_BYTES",

    "CP_NUM_INDICES"
};

/* isn't there a clever c way to avoid this? */
char *darshan_f_names[] = {
    "CP_F_OPEN_TIMESTAMP",        /* timestamp of first open */
    "CP_F_READ_START_TIMESTAMP",  /* timestamp of first read */
    "CP_F_WRITE_START_TIMESTAMP", /* timestamp of first write */
    "CP_F_CLOSE_TIMESTAMP",       /* timestamp of last close */
    "CP_F_READ_END_TIMESTAMP",    /* timestamp of last read */
    "CP_F_WRITE_END_TIMESTAMP",   /* timestamp of last write */
    "CP_F_POSIX_READ_TIME",       /* cumulative posix read time */
    "CP_F_POSIX_WRITE_TIME",      /* cumulative posix write time */
    "CP_F_POSIX_META_TIME",       /* cumulative posix meta time */
    "CP_F_MPI_META_TIME",         /* cumulative mpi-io metadata time */
    "CP_F_MPI_READ_TIME",         /* cumulative mpi-io read time */
    "CP_F_MPI_WRITE_TIME",        /* cumulative mpi-io write time */
    "CP_F_MAX_READ_TIME",
    "CP_F_MAX_WRITE_TIME",
    "CP_F_FASTEST_RANK_TIME",
    "CP_F_SLOWEST_RANK_TIME",
    "CP_F_VARIANCE_RANK_TIME",
    "CP_F_VARIANCE_RANK_BYTES",

    "CP_F_NUM_INDICES"
};

/* function pointers so that we can switch functions depending on what file
 * version is detected
 */
int (*getjob_internal)(darshan_fd file, struct darshan_job *job);
int (*getfile_internal)(darshan_fd fd, 
    struct darshan_job *job, 
    struct darshan_file *file);
#define JOB_SIZE_124 28
#define JOB_SIZE_200 56
#define JOB_SIZE_201 120
#define CP_JOB_RECORD_SIZE_200 1024
#define CP_JOB_RECORD_SIZE_1x 1024

/* internal routines for parsing different file versions */
static int getjob_internal_204(darshan_fd file, struct darshan_job *job);
static int getjob_internal_201(darshan_fd file, struct darshan_job *job);
static int getjob_internal_200(darshan_fd file, struct darshan_job *job);
static int getfile_internal_204(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getfile_internal_200(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getjob_internal_124(darshan_fd file, struct darshan_job *job);
static int getfile_internal_124(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getfile_internal_122(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getfile_internal_121(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file);
static int getfile_internal_1x(darshan_fd fd, struct darshan_job *job, 
    struct darshan_file *file, int n_counters, int n_fcounters);
static void shift_missing_1_24(struct darshan_file* file);
static void shift_missing_1_22(struct darshan_file* file);
static void shift_missing_1_21(struct darshan_file* file);

static int darshan_log_seek(darshan_fd fd, int64_t offset);
static int darshan_log_read(darshan_fd fd, void* buf, int len);
static int darshan_log_write(darshan_fd fd, void* buf, int len);
static const char* darshan_log_error(darshan_fd fd, int* errnum);

/* a rather crude API for accessing raw binary darshan files */
darshan_fd darshan_log_open(const char *name, const char* mode)
{
    int test_fd;
    uint8_t magic[2];
    int ret;
    int try_bz2 = 1;
    int len = strlen(name);

    /* we only allows "w" or "r" modes, nothing fancy */
    assert(strlen(mode) == 1);
    assert(mode[0] == 'r' || mode[0] == 'w');

    darshan_fd tmp_fd = malloc(sizeof(*tmp_fd));
    if(!tmp_fd)
        return(NULL);
    memset(tmp_fd, 0, sizeof(*tmp_fd));

    tmp_fd->mode[0] = mode[0];
    tmp_fd->mode[1] = mode[1];
    tmp_fd->name  = strdup(name);
    if(!tmp_fd->name)
    {
        free(tmp_fd);
        return(NULL);
    }

    if(strcmp(mode, "r") == 0)
    {
        /* Try to detect if existing file is a bzip2 file or not.  Both 
         * libbz2 and libz will fall back to normal I/O (without compression) 
         * automatically, so we need to do some detection manually up front 
         * in order to get a chance to try both compression formats.
         */
        test_fd = open(name, O_RDONLY);
        if(test_fd < 0)
        {
            perror("open");
            free(tmp_fd->name);
            free(tmp_fd);
            return(NULL);
        }
        ret = read(test_fd, &magic, 2);
        if(ret != 2)
        {
            fprintf(stderr, "Error: failed to read any data from %s.\n", 
                name);
            free(tmp_fd->name);
            free(tmp_fd);
            close(test_fd);
            return(NULL);
        }
        /* header magic for bz2 */
        if(magic[0] != 0x42 && magic[1] != 0x5A)
        {
            try_bz2 = 0;
        }
        close(test_fd);
    }

    if(strcmp(mode, "w") == 0)
    {
        /* TODO: is this the behavior that we want? */
        /* if we are writing a new file, go by the file extension to tell
         * whether to use bz2 or not?
         */
        if(len >= 3 && name[len-3] == 'b' && name[len-2] == 'z' && name[len-1] == '2')
            try_bz2 = 1;
        else
            try_bz2 = 0;
    }

#ifdef HAVE_LIBBZ2
    if(try_bz2)
    {
        tmp_fd->bzf = BZ2_bzopen(name, mode);
        if(!tmp_fd->bzf)
        {
            free(tmp_fd->name);
            free(tmp_fd);
            return(NULL);
        }
        return(tmp_fd);
    }
#else
    if(try_bz2)
    {
        fprintf(stderr, "Error: this Darshan build does not support bz2 files.\n");
        fprintf(stderr, "Error: please install libbz2-dev and reconfigure.\n");
        return(NULL);
    }
#endif

    tmp_fd->gzf = gzopen(name, mode);
    if(!tmp_fd->gzf)
    {
        free(tmp_fd->name);
        free(tmp_fd);
        tmp_fd = NULL;
    }
    return tmp_fd;
}

/* darshan_log_getjob()
 *
 * returns 0 on success, -1 on failure
 */
int darshan_log_getjob(darshan_fd file, struct darshan_job *job)
{
    int ret;
    char buffer[DARSHAN_JOB_METADATA_LEN];

    ret = darshan_log_seek(file, 0);
    if(ret < 0)
        return(ret);

    /* read version number first so we know how to digest the rest of the
     * file
     */
    ret = darshan_log_read(file, file->version, 10);
    if(ret < 10)
    {
        fprintf(stderr, "Error: invalid log file (failed to read version).\n");
        return(-1);
    }

    if(strcmp(file->version, "2.05") == 0)
    {
        getjob_internal = getjob_internal_204;
        getfile_internal = getfile_internal_204;
        file->job_struct_size = sizeof(*job);
        file->COMPAT_CP_EXE_LEN = CP_EXE_LEN;
    }
    else if(strcmp(file->version, "2.04") == 0)
    {
        getjob_internal = getjob_internal_204;
        getfile_internal = getfile_internal_204;
        file->job_struct_size = sizeof(*job);
        file->COMPAT_CP_EXE_LEN = CP_EXE_LEN;
    }
    else if(strcmp(file->version, "2.03") == 0)
    {
        getjob_internal = getjob_internal_201;
        getfile_internal = getfile_internal_200;
        file->job_struct_size = JOB_SIZE_201;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_200-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "2.02") == 0)
    {
        getjob_internal = getjob_internal_201;
        getfile_internal = getfile_internal_200;
        file->job_struct_size = JOB_SIZE_201;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_200-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "2.01") == 0)
    {
        getjob_internal = getjob_internal_201;
        getfile_internal = getfile_internal_200;
        file->job_struct_size = JOB_SIZE_201;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_200-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "2.00") == 0)
    {
        getjob_internal = getjob_internal_200;
        getfile_internal = getfile_internal_200;
        file->job_struct_size = JOB_SIZE_200;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_200-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "1.24") == 0)
    {
        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_124;
        file->job_struct_size = JOB_SIZE_124;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_1x-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "1.23") == 0)
    {
        /* same as 1.24, except that mnt points may be incorrect */
        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_124;
        file->job_struct_size = JOB_SIZE_124;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_1x-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "1.22") == 0)
    {
        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_122;
        file->job_struct_size = JOB_SIZE_124;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_1x-file->job_struct_size-1;
    }
    else if(strcmp(file->version, "1.21") == 0)
    {
        getjob_internal = getjob_internal_124;
        getfile_internal = getfile_internal_121;
        file->job_struct_size = JOB_SIZE_124;
        file->COMPAT_CP_EXE_LEN = CP_JOB_RECORD_SIZE_1x-file->job_struct_size-1;
    }
    else
    {
        fprintf(stderr, "Error: incompatible darshan file.\n");
        fprintf(stderr, "Error: expected version %s, but got %s\n", 
                CP_VERSION, file->version);
        return(-1);
    }

    ret = getjob_internal(file, job);

    if (ret == 0)
    {
#ifdef HAVE_STRNDUP
        char *metadata = strndup(job->metadata, sizeof(job->metadata));
#else
        char *metadata = strdup(job->metadata);
#endif
        char *kv;
        char *key;
        char *value;
        char *save;

        for(kv=strtok_r(metadata, "\n", &save);
            kv != NULL;
            kv=strtok_r(NULL, "\n", &save))
        {
            /* NOTE: we intentionally only split on the first = character.
             * There may be additional = characters in the value portion
             * (for example, when storing mpi-io hints).
             */
            strcpy(buffer, kv);
            key = buffer;
            value = index(buffer, '=');
            if(!value)
                continue;
            /* convert = to a null terminator to split key and value */
            value[0] = '\0';
            value++;
            if (strcmp(key, "prev_ver") == 0)
            {
                strncpy(job->version_string, value, sizeof(job->version_string));
            }
        }
        free(metadata);
    }

    return(ret);
}

/* darshan_putjob()
 * write job header in gzfile
 *
 * return 0 on success, -1 on failure.
 */
int darshan_log_putjob(darshan_fd file, struct darshan_job *job)
{
    struct darshan_job job_copy;
    char    pv_str[64];
    int     ret;
    int len;

    ret = darshan_log_seek(file, 0);
    if(ret < 0)
        return(ret);

    memset(&job_copy, 0, sizeof(job_copy));
    memcpy(&job_copy, job, sizeof(job_copy));
    /* check for newline in existing metadata, add if needed */
    len = strlen(job_copy.metadata);
    if(len > 0 && len < DARSHAN_JOB_METADATA_LEN)
    {
        if(job_copy.metadata[len-1] != '\n')
        {
            job_copy.metadata[len] = '\n';
            job_copy.metadata[len+1] = '\0';
        }
    }

    sprintf(pv_str, "prev_ver=%s\n", job->version_string);
    sprintf(job_copy.version_string, "%s", CP_VERSION);
    if(strlen(job_copy.metadata) + strlen(pv_str) < DARSHAN_JOB_METADATA_LEN)
        strncat(job_copy.metadata, pv_str, strlen(pv_str));
    else
        sprintf(job_copy.metadata, "%s", pv_str);
    job_copy.magic_nr = CP_MAGIC_NR;

    ret = darshan_log_write(file, &job_copy, sizeof(job_copy));
    if (ret != sizeof(job_copy))
    {
        fprintf(stderr, "Error: failed to write job header: %d\n", ret);
        return(-1);
    }

    return(0);
}

/* darshan_log_getfile()
 *
 * return 1 if file record found, 0 on eof, and -1 on error
 */
int darshan_log_getfile(darshan_fd fd, struct darshan_job *job, struct darshan_file *file)
{
    int ret;

    ret = getfile_internal(fd, job, file);

    return(ret);
}

/* darshan_log_putfile()
 *
 * return 0 if file record written, -1 on error.
 */
int darshan_log_putfile(darshan_fd fd, struct darshan_job *job, struct darshan_file *file)
{
    int     ret;

    if(fd->pos < CP_JOB_RECORD_SIZE)
    {
        ret = darshan_log_seek(fd, CP_JOB_RECORD_SIZE);
        if(ret < 0)
            return(ret);
    }

    ret = darshan_log_write(fd, file, sizeof(*file));
    if (ret != sizeof(*file))
    {
        fprintf(stderr, "Error: writing file record failed: %d\n", ret);
        return(-1);
    }

    return(0);
}

/* darshan_log_getmounts()
 * 
 * retrieves mount table information from the log.  Note that devs, mnt_pts,
 * and fs_types are arrays that will be allocated by the function and must
 * be freed by the caller.  count will indicate the size of the arrays
 */
int darshan_log_getmounts(darshan_fd fd, int64_t** devs, char*** mnt_pts, char***
    fs_types, int* count)
{
    int ret;
    char* pos;
    int array_index = 0;
    char buf[fd->COMPAT_CP_EXE_LEN+1];

    ret = darshan_log_seek(fd, fd->job_struct_size);
    if(ret < 0)
        return(ret);

    ret = darshan_log_read(fd, buf, (fd->COMPAT_CP_EXE_LEN + 1));
    if (ret < (fd->COMPAT_CP_EXE_LEN + 1))
    {
        perror("darshan_log_read");
        return(-1);
    }

    /* count entries */
    *count = 0;
    pos = buf;
    while((pos = strchr(pos, '\n')) != NULL)
    {
        pos++;
        (*count)++;
    }

    if(*count == 0)
    {
        /* no mount entries present */
        return(0);
    }

    /* allocate output arrays */
    *devs = malloc((*count)*sizeof(int64_t));
    assert(*devs);
    *mnt_pts = malloc((*count)*sizeof(char*));
    assert(*mnt_pts);
    *fs_types = malloc((*count)*sizeof(char*));
    assert(*fs_types);
    
    /* work backwards through the table and parse each line (except for
     * first, which holds command line information)
     */
    while((pos = strrchr(buf, '\n')) != NULL)
    {
        /* overestimate string lengths */
        (*mnt_pts)[array_index] = malloc(fd->COMPAT_CP_EXE_LEN);
        assert((*mnt_pts)[array_index]);
        (*fs_types)[array_index] = malloc(fd->COMPAT_CP_EXE_LEN);
        assert((*fs_types)[array_index]);
        
        ret = sscanf(++pos, "%" PRId64 "\t%s\t%s", &(*devs)[array_index],
            (*fs_types)[array_index], (*mnt_pts)[array_index]);

        if(ret != 3)
        {
            fprintf(stderr, "Error: poorly formatted mount table in log file.\n");
            return(-1);
        }
        pos--;
        *pos = '\0';
        array_index++;
    }

    return (0);
}

/* darshan_log_putmounts
 *
 * encode mount information back into mtab format.
 *
 * returns 0 on success, -1 on failure.
 */
int darshan_log_putmounts(darshan_fd fd, int64_t* devs, char** mnt_pts, char** fs_types, int count)
{
    int     ret;
    char    line[1024];
    int     i;

    for(i=count-1; i>=0; i--)
    {
        sprintf(line, "\n%" PRId64 "\t%s\t%s",
                devs[i], fs_types[i], mnt_pts[i]);
        ret = darshan_log_write(fd, line, strlen(line));
        if (ret != strlen(line))
        {
            fprintf(stderr, "Error: failed to write mount entry: %d\n", ret);
            return(-1);
        }
    }

    /* seek ahead to end of exe region, will be zero filled */
    ret = darshan_log_seek(fd, CP_JOB_RECORD_SIZE);
    if (ret)
    {
        fprintf(stderr, "Error: forward seek failed: %d\n", CP_JOB_RECORD_SIZE);
    }

    return(0);
}

int darshan_log_getexe(darshan_fd fd, char *buf)
{
    int ret;
    char* newline;

    ret = darshan_log_seek(fd, fd->job_struct_size);
    if(ret < 0)
        return(ret);

    ret = darshan_log_read(fd, buf, (fd->COMPAT_CP_EXE_LEN + 1));
    if (ret < (fd->COMPAT_CP_EXE_LEN + 1))
    {
        perror("darshan_log_read");
        return(-1);
    }

    /* this call is only supposed to return the exe string, but starting in
     * log format 1.23 there could be a table of mount entry information
     * after the exe.  Look for newline character and truncate there.
     */
    newline = strchr(buf, '\n');
    if(newline)
        *newline = '\0';

    return (0);
}

/* darshan_log_putexe()
 *
 * Write the exe string to the log.
 *
 * return 0 on success, -1 on failure.
 */
int darshan_log_putexe(darshan_fd fd, char *buf)
{
    int     ret;
    int     len;

    ret = darshan_log_seek(fd, sizeof(struct darshan_job));
    if(ret < 0)
        return(ret);

    len = strlen(buf);

    ret = darshan_log_write(fd, buf, len);
    if (ret != len)
    {
        fprintf(stderr, "Error: failed to write exe info: %d\n", ret);
        ret = -1;
    }

    return(ret);
}

void darshan_log_close(darshan_fd file)
{
#ifdef HAVE_LIBBZ2
    if(file->bzf)
        BZ2_bzclose(file->bzf);
#endif

    if(file->gzf)
        gzclose(file->gzf);

    free(file->name);
    free(file);
}

/* darshan_log_print_version_warnings()
 *
 * Print summary of any problems with the detected log format
 */
void darshan_log_print_version_warnings(struct darshan_job *job)
{
    if(strcmp(job->version_string, "2.05") == 0)
    {
        /* current version */
        return;
    }

    if(strcmp(job->version_string, "2.04") == 0)
    {
        printf("# WARNING: version 2.04 log format has the following limitations:\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    if(strcmp(job->version_string, "2.03") == 0)
    {
        /* no meaningful change to interpretation of log file, 2.03 just
         * increased the header space available for annotations.
         */
        printf("# WARNING: version 2.03 log format has the following limitations:\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    if(strcmp(job->version_string, "2.02") == 0)
    {
        printf("# WARNING: version 2.01 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    if(strcmp(job->version_string, "2.01") == 0)
    {
        printf("# WARNING: version 2.01 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - inaccurate statistics in some multi-threaded cases.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    if(strcmp(job->version_string, "2.00") == 0)
    {
        printf("# WARNING: version 2.00 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - inaccurate statistics in some multi-threaded cases.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }
 
    if(strcmp(job->version_string, "1.24") == 0)
    {
        printf("# WARNING: version 1.24 log format does not support the following parameters:\n");
        printf("#   CP_FASTEST_RANK\n");
        printf("#   CP_FASTEST_RANK_BYTES\n");
        printf("#   CP_SLOWEST_RANK\n");
        printf("#   CP_SLOWEST_RANK_BYTES\n");
        printf("#   CP_F_FASTEST_RANK_TIME\n");
        printf("#   CP_F_SLOWEST_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_BYTES\n");
        printf("# WARNING: version 1.24 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - does not store the job id in the file.\n");
        printf("# - inaccurate statistics in some multi-threaded cases.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }
    
    if(strcmp(job->version_string, "1.23") == 0)
    {
        printf("# WARNING: version 1.23 log format does not support the following parameters:\n");
        printf("#   CP_FASTEST_RANK\n");
        printf("#   CP_FASTEST_RANK_BYTES\n");
        printf("#   CP_SLOWEST_RANK\n");
        printf("#   CP_SLOWEST_RANK_BYTES\n");
        printf("#   CP_F_FASTEST_RANK_TIME\n");
        printf("#   CP_F_SLOWEST_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_BYTES\n");
        printf("# WARNING: version 1.23 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - may have incorrect mount point mappings for files with rank > 0.\n");
        printf("# - does not store the job id in the file.\n");
        printf("# - inaccurate statistics in some multi-threaded cases.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    if(strcmp(job->version_string, "1.22") == 0)
    {
        printf("# WARNING: version 1.22 log format does not support the following parameters:\n");
        printf("#   CP_DEVICE\n");
        printf("#   CP_SIZE_AT_OPEN\n");
        printf("#   CP_FASTEST_RANK\n");
        printf("#   CP_FASTEST_RANK_BYTES\n");
        printf("#   CP_SLOWEST_RANK\n");
        printf("#   CP_SLOWEST_RANK_BYTES\n");
        printf("#   CP_F_FASTEST_RANK_TIME\n");
        printf("#   CP_F_SLOWEST_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_BYTES\n");
        printf("# WARNING: version 1.22 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - does not record mounted file systems, mount points, or fs types.\n");
        printf("# - attributes syncs to cumulative metadata time, rather than cumulative write time.\n");
        printf("# - does not store the job id in the file.\n");
        printf("# - inaccurate statistics in some multi-threaded cases.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    if(strcmp(job->version_string, "1.21") == 0)
    {
        printf("# WARNING: version 1.21 log format does not support the following parameters:\n");
        printf("#   CP_INDEP_NC_OPENS\n");
        printf("#   CP_COLL_NC_OPENS\n");
        printf("#   CP_HDF5_OPENS\n");
        printf("#   CP_MAX_READ_TIME_SIZE\n");
        printf("#   CP_MAX_WRITE_TIME_SIZE\n");
        printf("#   CP_DEVICE\n");
        printf("#   CP_SIZE_AT_OPEN\n");
        printf("#   CP_F_MAX_READ_TIME\n");
        printf("#   CP_F_MAX_WRITE_TIME\n");
        printf("#   CP_FASTEST_RANK\n");
        printf("#   CP_FASTEST_RANK_BYTES\n");
        printf("#   CP_SLOWEST_RANK\n");
        printf("#   CP_SLOWEST_RANK_BYTES\n");
        printf("#   CP_F_FASTEST_RANK_TIME\n");
        printf("#   CP_F_SLOWEST_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_TIME\n");
        printf("#   CP_F_VARIANCE_RANK_BYTES\n");
        printf("# WARNING: version 1.21 log format has the following limitations:\n");
        printf("# - *_TIMESTAMP fields are not normalized relative to MPI_Init() time.\n");
        printf("# - does not record mounted file systems, mount points, or fs types.\n");
        printf("# - attributes syncs to cumulative metadata time, rather than cumulative write time.\n");
        printf("# - does not store the job id in the file.\n");
        printf("# - inaccurate statistics in some multi-threaded cases.\n");
        printf("# - CP_F_SLOWEST_RANK_TIME and CP_F_FASTEST_RANK_TIME only report elapsed time at the POSIX level.\n");
        return;
    }

    fprintf(stderr, "Error: version %s not supported by parser.\n",
        job->version_string);
    return;
}

/* shift_missing_1_21()
 *
 * translates indices to account for counters that weren't present in log
 * format 1.21
 */
/*******************************
 * version 1.21 to 2.00 differences 
 * - added:
 *   - CP_INDEP_NC_OPENS
 *   - CP_COLL_NC_OPENS
 *   - CP_HDF5_OPENS
 *   - CP_MAX_READ_TIME_SIZE
 *   - CP_MAX_WRITE_TIME_SIZE
 *   - CP_DEVICE
 *   - CP_SIZE_AT_OPEN
 *   - CP_FASTEST_RANK
 *   - CP_FASTEST_RANK_BYTES
 *   - CP_SLOWEST_RANK
 *   - CP_SLOWEST_RANK_BYTES
 *   - CP_F_MAX_READ_TIME
 *   - CP_F_MAX_WRITE_TIME
 *   - CP_F_FASTEST_RANK_TIME
 *   - CP_F_SLOWEST_RANK_TIME
 *   - CP_F_VARIANCE_RANK_TIME
 *   - CP_F_VARIANCE_RANK_BYTES
 * - changed params:
 *   - CP_FILE_RECORD_SIZE: 1184 to 1328
 *   - CP_NUM_INDICES: 133 to 144
 *   - CP_F_NUM_INDICES: 12 to 18
 */
static void shift_missing_1_21(struct darshan_file* file)
{
    int c_index = 0;
    int missing_counters[] = {
        CP_INDEP_NC_OPENS,
        CP_COLL_NC_OPENS,
        CP_HDF5_OPENS,
        CP_MAX_READ_TIME_SIZE,
        CP_MAX_WRITE_TIME_SIZE,
        CP_DEVICE,
        CP_SIZE_AT_OPEN,
        CP_FASTEST_RANK,
        CP_FASTEST_RANK_BYTES,
        CP_SLOWEST_RANK,
        CP_SLOWEST_RANK_BYTES,
        -1};
    int missing_f_counters[] = {
        CP_F_MAX_READ_TIME,
        CP_F_MAX_WRITE_TIME,
        CP_F_FASTEST_RANK_TIME,
        CP_F_SLOWEST_RANK_TIME,
        CP_F_VARIANCE_RANK_TIME,
        CP_F_VARIANCE_RANK_BYTES,
        -1};

    c_index = 0;
    while(missing_counters[c_index] != -1)
    {
        int missing_counter = missing_counters[c_index];
        c_index++;
        if(missing_counter < (CP_NUM_INDICES - 1))
        {
            /* shift down */
            memmove(&file->counters[missing_counter+1],
                &file->counters[missing_counter],
                (CP_NUM_INDICES-missing_counter-1)*sizeof(int64_t));
        }
        /* zero out missing counter */
        file->counters[missing_counter] = 0;
    }

    c_index = 0;
    while(missing_f_counters[c_index] != -1)
    {
        int missing_counter = missing_f_counters[c_index];
        c_index++;
        if(missing_counter < (CP_F_NUM_INDICES - 1))
        {
            /* shift down */
            memmove(&file->fcounters[missing_counter+1],
                &file->fcounters[missing_counter],
                (CP_F_NUM_INDICES-missing_counter-1)*sizeof(double));
        }
        /* zero out missing counter */
        file->fcounters[missing_counter] = 0;
    }

    return;