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votget.c
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votget.c
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/**
* VOTGET -- Download select/all access references in a VOTable.
*
* Usage:
*
* votget [<opts>] <votable.xml>
* votget [<opts>] --samp # to listen for SMAP messages
*
* Where
* -b,--base <base> Base output filename
* -e,--extn [<extn>] Extension to add to filename (or auto)
* -f,--fmt <fmt> Download only specified <type>
* -s,--sum Use checksum as file number
* -t,--tmp Input file is temporary, delete when done
* -u,--ucd <ucd> Use ucd to identify acref column
*
* -o,--output <fname> Output filename (single download)
* -v,--verbose Verbose output
* -x,--extract Extract access references
*
* -A,--acref <colnum> Col number for acref column (0-indexed)
* -B,--bkg Background, i.e. run in forked child process
* -C,--cache Cache the downloaded file
* -D,--download Set download directory
* -F,--fmtcol <colnum> Col number for format column (0-indexed)
* -N,--num <N> Number of simultaneous downloads
* -S,--samp start as SAMP listener
* -m,--mtype <mtype> mtype to wait for
*
* -h,--help Print help summary
* -d,--debug Debug output
* --test Run unit tests
*
* <votable> VOTable to process
*
* @file votget.c
* @author Mike Fitzpatrick
* @date 6/03/12
*
* @brief Download select/all access references in a VOTable.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/errno.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <pthread.h>
#include <curl/curl.h>
#include <curl/easy.h>
#include "samp.h"
#include "votParse.h"
#include "voApps.h"
#define MIN_THREADS 4 /* min no. simultaneous thread */
#define MAX_THREADS 64 /* max no. simultaneous threads */
#define MAX_DOWNLOADS 4096 /* max no. files to download */
#define MAX_TRYS 3 /* max download attempts */
#define NAXIS_UCD "VOX:Image_Naxis"
#define NAXES_UCD "VOX:Image_Naxes"
#define SCALE_UCD "VOX:Image_Scale"
#define ACREF_UCD "VOX:Image_AccessReference"
#define FORMAT_UCD "VOX:Image_Format"
static int vot = 0; /* VOTable handle */
static int verbose = 0; /* verbose parameter */
static int debug = 0; /* debug flag */
static int extract = 0; /* extract references only */
static int detach = 0; /* run as detached process */
static int nfiles = 0; /* number of download files */
static int ngot = 0; /* number of files downloaded */
static int seq = 1; /* use sequential file numbers */
static int isCache = 0; /* is this a cache file? */
static int isTemp = 0; /* is this a temp file? */
static int force = 0; /* overwrite existing file */
static int acol = -1; /* access reference column */
static int tcol = -1; /* image type column */
static int filenum = 0; /* running download file number */
static int nthreads = MIN_THREADS; /* number of download threads */
static int maxTrys = MAX_TRYS; /* download attempts */
static char *base = NULL; /* output base filename */
static char *extn = NULL; /* output filename extension */
static char *dir = NULL; /* download directory */
static char *afname = NULL; /* output acref filename */
static char *acref = NULL; /* acref url */
static char *acref_ucd = NULL; /* acref UCD */
static char *fmt = NULL; /* image format */
static char *fmt_ucd = NULL; /* image format UCD */
static FILE *afd = (FILE *) NULL; /* acref file descriptor */
static pthread_mutex_t counter_mut = PTHREAD_MUTEX_INITIALIZER;
typedef void (*SIGFUNC)(); /* signal handler type */
typedef struct {
char url[SZ_URL]; /* access URL */
char fname[SZ_URL]; /* local filename */
int tnum; /* worker thread number */
} Acref, *AcrefP;
Acref aclist[MAX_DOWNLOADS]; /* access list */
/* Task specific option declarations.
*/
int votget (int argc, char **argv, size_t *len, void **result);
static Task self = { "votget", votget, 0, 0, 0 };
static char *opts = "%:hb:e:f:dstu:o:vxA:BCD:F:N:Sm:";
static struct option long_opts[] = {
{ "base", 1, 0, 'b'}, /* task option */
{ "extn", 1, 0, 'e'}, /* task option */
{ "fmt", 1, 0, 'f'}, /* task option */
{ "sum", 2, 0, 's'}, /* task option */
{ "tmp", 2, 0, 't'}, /* task option */
{ "ucd", 1, 0, 'u'}, /* task option */
{ "output", 1, 0, 'o'}, /* task option */
{ "verbose", 2, 0, 'v'}, /* task option */
{ "extract", 2, 0, 'x'}, /* task option */
{ "acref", 1, 0, 'A'}, /* task option */
{ "bkg", 2, 0, 'B'}, /* task option */
{ "cache", 2, 0, 'C'}, /* task option */
{ "download", 1, 0, 'D'}, /* task option */
{ "fmtcol", 1, 0, 'F'}, /* task option */
{ "num", 1, 0, 'N'}, /* task option */
{ "force", 2, 0, 'O'}, /* task option */
{ "samp", 2, 0, 'S'}, /* task option */
{ "mtype", 1, 0, 'm'}, /* task option */
{ "help", 2, 0, 'h'}, /* required */
{ "debug", 2, 0, 'd'}, /* required */
{ "test", 1, 0, '%'}, /* required */
{ NULL, 0, 0, 0 }
};
static int do_return = 0; /* NOT USED */
static int do_samp = 0; /* samp listener? */
static char *mtype = NULL; /* samp mtype */
static void Usage (void);
static void Tests (char *input);
/* Public methods.
*/
extern int vot_isValidFormat (char *fmt);
extern int vot_atoi (char *val);
extern int vot_sum32 (char *str);
extern char *strcasestr ();
/* Private methods.
*/
static void votableHandler (char *url, char *tblId, char *name);
static int vot_procFile (char *iname);
static int vot_isVOTable (char *infile);
static int vot_acrefColumn (handle_t tab);
static int vot_typeColumn (handle_t tab);
static int vot_loadText (char *infile);
static int vot_loadVOTable (char *infile);
static int vot_getData (char *url, char *ofname);
static void vot_saveAcref (char *acref, int num, int fnum);
static void *vot_getAclist (void *arg);
static void vot_printAclist ();
static void vot_reaper (int sig, int *arg1, int *arg2);
/**
* Program entry point.
*/
int
votget (int argc, char **argv, size_t *reslen, void **result)
{
char **pargv, optval[SZ_FNAME];
char *iname = NULL, ch;
int samp = 0, pos = 0, stat = OK;
/* Initialize.
*/
*reslen = 0;
*result = NULL;
/* Parse the argument list.
*/
pargv = vo_paramInit (argc, argv, opts, long_opts);
while ((ch = vo_paramNext (opts,long_opts,argc,pargv,optval,&pos)) != 0) {
if (ch > 0) {
switch (ch) {
case '%': Tests (optval); return (self.nfail);
case 'h': Usage (); return (OK);
case 'b': base = strdup (optval); break;
case 'e': extn = strdup (optval); break;
case 'f': if (!vot_isValidFormat ((fmt = strdup (optval)))) {
fprintf (stderr, "Error: invalid format '%s'\n",
fmt);
return (ERR);
}
break;
case 'd': debug++; break;
case 's': seq=0; break;
case 't': isTemp++; break;
case 'u': acref_ucd = strdup (optval); break;
case 'o': afname = strdup (optval); break;
case 'v': verbose++; break;
case 'x': extract++; break;
case 'A': acol = vot_atoi (optval); break;
case 'B': detach++; break;
case 'C': isCache++; break;
case 'D': dir = strdup (optval); break;
case 'F': tcol = vot_atoi (optval); break;
case 'N': nthreads = vot_atoi (optval); break;
case 'O': force++; break;
case 'S': do_samp++; break;
case 'm': mtype = strdup (optval);; break;
default:
fprintf (stderr, "Invalid option '%c'\n", ch);
return (1);
}
} else if (ch == PARG_ERR) {
return (ERR);
} else {
iname = strdup (optval);
}
}
/* Sanity checks
*/
if (iname == NULL) iname = strdup ("stdin");
if (strcmp (iname, "-") == 0) { free (iname), iname = strdup ("stdin"); }
/* Setup defaults and initialize.
*/
do_return = 0;
memset (&aclist[0], 0, (sizeof (Acref) * MAX_DOWNLOADS));
if (afname && (afd = fopen (afname, "a+")) == (FILE *) NULL) {
if (verbose)
fprintf (stderr, "Error: cannot open aclist file '%s'\n", afname);
return (ERR);
}
if (!base) base = strdup ("file");
if (!mtype) mtype = strdup ("table.load.votable");
if (!fmt_ucd) fmt_ucd = strdup (FORMAT_UCD);
if (!acref_ucd) acref_ucd = strdup (ACREF_UCD);
if (do_samp) {
/* Initialize and startup the SAMP interface. Wait for a message.
*/
if (verbose)
fprintf (stderr, "Initializing samp ....\n");
samp = sampInit ("votget", "VOClient Task");
samp_Subscribe (samp, mtype, votableHandler);
if (sampStartup (samp) < 0)
return (ERR);
if (verbose)
fprintf (stderr, "Type <cr> to quit ....");
while (fgetc(stdin) != EOF)
break;
sampShutdown (samp);
} else {
/* Process the file.
*/
stat = vot_procFile (iname);
}
/* Close the table and clean up.
*/
if (base) free (base);
if (extn) free (extn);
if (dir) free (dir);
if (afname) free (afname);
if (acref) free (acref);
if (acref_ucd) free (acref_ucd);
if (fmt) free (fmt);
if (fmt_ucd) free (fmt_ucd);
if (mtype) free (mtype);
vo_paramFree (argc, pargv);
if (detach)
exit (OK);
else
return (stat);
}
/**
* VOTABLEHANDLER -- Callback for the load.table.votable message.
*/
static void
votableHandler (char *url, char *tblId, char *name)
{
char fname[SZ_FNAME];
memset (fname, 0, SZ_FNAME);
if (verbose)
printf ("\n");
if (strncmp (url, "http://", 7) == 0) {
strcpy (fname, "/tmp/votgetXXXXXX"); /* temp download name */
mktemp (fname);
if (vot_getData (url, fname) < 0)
fprintf (stderr, "Error accessing url '%s'\n", url);
vot_procFile (fname);
unlink (fname);
} else if (strncmp (url, "file://", 7) == 0) {
strcpy (fname, &url[7]);
vot_procFile (fname);
} else {
fprintf (stderr, "Error: unsupported URL type '%s'\n", url);
return;
}
/* Clean up for the next file to process.
*/
memset (&aclist[0], 0, (sizeof (Acref) * MAX_DOWNLOADS));
nfiles = 0;
}
/**
* VOT_PROCFILE -- Process a VOTable file.
*/
static int
vot_procFile (char *iname)
{
int stat = OK;
/* Determine the type of input file.
*/
if (strncmp (iname, "http://", 7) == 0) {
if (vot_loadVOTable (iname) < 0) {
fprintf (stderr, "Error opening votable '%s'\n", iname);
return ( (stat = ERR) );
}
} else {
switch ((vot = vot_isVOTable (iname))) {
case -1: fprintf (stderr, "Error opening file '%s'\n", iname);
return ( (stat = ERR) );
case 0: if (vot_loadText (iname) < 0) {
fprintf (stderr, "Error opening text file '%s'\n", iname);
return ( (stat = ERR) );
}
break;
case 1: if (vot_loadVOTable (iname) < 0) {
fprintf (stderr, "Error opening votable '%s'\n", iname);
return ( (stat = ERR) );
}
break;
}
}
/* If all we're doing is extracting the URLs we can quit now.
*/
if (extract)
return (OK);
if (debug) {
fprintf (stderr, "acol = %d tcol = %d\n", acol, tcol);
fprintf (stderr, "Downloading %d files ....\n", nfiles);
vot_printAclist ();
}
/* If we've been asked to detach, fork off to do the downloads in
* a child, and return to the caller.
*/
if (detach) {
pid_t pid;
signal (SIGCHLD, (SIGFUNC)vot_reaper);
switch ((pid = fork ())) {
case -1: return (ERR); /* We are an error */
case 0: break; /* We are the child */
default: return (OK); /* We are the parent */
}
}
/* Initialize the download directory.
*/
if (dir) {
if (access (dir, F_OK) < 0)
mkdir (dir, 0755);
if (access (dir, W_OK) < 0) {
if (verbose)
fprintf (stderr, "Error: Cannot write to directory '%s'\n", dir);
return (ERR);
}
chdir (dir);
}
/* Do the downloads.
*/
if (nfiles < MIN_THREADS)
nthreads = nfiles;
if (nthreads == 1) {
vot_getAclist (NULL);
} else {
/* Spawn the worker threads.
*/
int rc = 0, tc = 0, status = 0, tnum[MAX_THREADS];
pthread_attr_t attr; /* thread attributes */
pthread_t thread[MAX_THREADS];
/* Initialize the service processing thread attributes and run 'em.
*/
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_JOINABLE);
if (verbose)
fprintf (stderr, "Starting download ....\r");
for (tc=0; tc < nthreads; tc++) {
tnum[tc] = tc;
if ((rc = pthread_create (&thread[tc], &attr, vot_getAclist,
(void *)&tnum[tc]))) {
fprintf (stderr, "ERROR: pthread_create() fails, code=%d\n",
rc);
return (-1);
}
}
/* Free attribute and wait for the threads to complete.
*/
pthread_attr_destroy (&attr);
for (tc=0; tc < nthreads; tc++) {
if ((rc = pthread_join (thread[tc], (void **)&status)) ) {
if (rc != ESRCH) {
fprintf (stderr,
"ERROR: pthread_join() fails, code=%d status=%d\n",
rc, status);
return (-1);
}
}
}
if (verbose) {
fprintf (stderr,
"Downloaded %d files -- Download complete (Total: %d)\n",
nfiles, (filenum+1));
fflush (stderr);
}
}
/* Remove input file if it is temporary.
*/
if (isTemp)
unlink (iname);
return (stat);
}
/**
* VOT_USAGE -- Print the task usage and exit.
*/
static void
Usage (void)
{
fprintf (stderr, "\n Usage:\n\t"
"votget [<opts>] [ <votable.xml> | <urls.txt> ]\n\t"
"votget [<opts>] --samp # to listen for SMAP messages\n"
"\n"
"Where\n"
" -b,--base <base> Base output filename\n"
" -e,--extn [<extn>] Extension to add to filename (or auto)\n"
" -f,--fmt <fmt> Download only specified <type>\n"
" -s,--sum Use 32-bit checksum as file numbers\n"
" -t,--tmp Input file is temporary, delete when done\n"
" -u,--ucd <ucd> Use ucd to identify acref column\n"
"\n"
" -o,--output <fname> Output filename (single download)\n"
" -v,--verbose Verbose output\n"
" -x,--extract Extract access references\n"
"\n"
" -A,--acref <colnum> Col number for acref column (0-indexed)\n"
" -B,--bkg Background, i.e. run in forked child\n"
" -C,--cache Cache the downloaded file\n"
" -D,--download Set download directory\n"
" -F,--fmtcol <colnum> Col number for format column (0-indexed)\n"
" -N,--num <N> Number of simultaneous downloads\n"
" -S,--samp start as SAMP listener\n"
"\n"
" -h,--help Print help summary\n"
" -d,--debug Debug output\n"
" --test Run unit tests\n"
"\n"
" <votable> VOTable to process\n"
"\n"
" Examples:\n\n"
" 1) Download all files in the VOTable 'results.xml', 3 files at\n"
" a time:\n\n"
" %% votget -N 3 results.xml\n"
"\n"
" 2) Start as a SAMP listener waiting for VOTable events to be \n"
" broadcast, saved files will begin with the string 'foo' and \n"
" contain a 'fits' filename extension:\n\n"
" %% votget -b foo -e fits -S\n"
"\n"
" To exit the task, hit the <CR>.\n"
"\n"
" 3) Download all the urls in the file 'urls.txt':\n\n"
" %% votget -b foo urls.txt\n"
"\n"
" 4) Extract all the access references in a VOTable:\n\n"
" %% votget -x results.xml\n"
"\n"
);
}
/**
* Tests -- Task unit tests.
*/
static void
Tests (char *input)
{
Task *task = &self;
char *urls = "http://iraf.noao.edu/votest/sia.xml\n";
vo_taskTest (task, "--help", NULL);
if (access (input, F_OK) != 0) {
fprintf (stderr, "Warning: cannot open file '%s'\n", input);
return;
}
vo_taskTestFile (urls, "urls.txt");
vo_taskTest (task, "-N", "3", input, NULL); // Ex 1
vo_taskTest (task, "-b", "foo", input, NULL); // Ex 3
vo_taskTest (task, "-x", input, NULL); // Ex 4
vo_taskTest (task, "-x", "-o", "/tmp/acref", input, NULL);
if (access ("/tmp/acref", F_OK) == 0) unlink ("/tmp/acref");
if (access ("urls.txt", F_OK) == 0) unlink ("urls.txt");
vo_taskTestReport (self);
}
/**********************************************************************
** Private Procedures
**********************************************************************/
/**
* VOT_REAPER -- Catch a SIGCHLD signal and reap all children.
*/
static void
vot_reaper (
int sig, /* signal which was trapped */
int *arg1, /* not used */
int *arg2 /* not used */
)
{
int status=0, pid=0;
while ((pid = waitpid ((pid_t) 0, &status, WNOHANG)) > 0)
;
}
/**
* VOT_LOADTEXT -- Load the access list from a text file. We assume the
* list is simply one url per line.
*/
static int
vot_loadText (char *infile)
{
int i = 0, fd, nread = 0, tnum = 0, sz = 0;
char *acref, *buf, *ip;
struct stat info;
nfiles = 0;
memset (&aclist[0], 0, (sizeof (Acref) * MAX_DOWNLOADS));
if ((fd = open (infile, O_RDONLY)) < 0)
return (-1);
if (stat (infile, &info) < 0) /* read the whole file */
return (-1);
sz = info.st_size;
buf = calloc (sz + 1, sizeof(char));
nread = read (fd, buf, sz);
close (fd);
acref = buf; /* point to 1st url */
for (i=0; *acref; i++) {
for (ip=acref; *ip && *ip != '\n'; ip++)
;
*ip = '\0';
vot_saveAcref (acref, i, filenum++);
acref = ip + 1;
nfiles++;
tnum++;
}
if (afd) /* close the acref file */
fclose (afd);
return (nfiles);
}
/**
* VOT_LOADVOTABLE -- Load the access list from a VOTable.
*/
static int
vot_loadVOTable (char *infile)
{
int i, tnum = 0;
int res, tab, data, tdata, tr;
char *acref;
nfiles = 0;
memset (&aclist[0], 0, (sizeof (Acref) * MAX_DOWNLOADS));
/* Open the table. This also parses it.
*/
if ( (vot = vot_openVOTABLE (infile) ) <= 0) {
if (verbose)
fprintf (stderr, "Error opening VOTable '%s'\n", infile);
return (ERR);
}
/* Loop over all the resources in the file. In most cases there will
* only be one <RESOURCE>, if not then the selection applies to all
* valid tables.
*/
for (res = vot_getRESOURCE (vot); res; res = vot_getNext (res)) {
/* Get the <TABLE> element.
*/
if (! (tab = vot_getTABLE (res))) {
if (verbose) fprintf (stderr, "Error: No <TABLE> in <RESOURCE>\n");
continue;
}
if ((data = vot_getDATA (tab)))
tdata = vot_getTABLEDATA (data);
else
continue; /* empty data table */
/* Loop through the FIELDs to find the acref. Let the cmdline param
* override the acref column ucd.
*/
acol = (acol < 0 ? vot_acrefColumn (tab) : acol);
tcol = (tcol < 0 ? vot_typeColumn (tab) : tcol);
/* Now scan the data table for acrefs. We got the acref column above
* so lookup the table cell directly for each row, either printing
* out the acref for a simple extract, or by adding to the access
* list to be processed below.
*/
i = 0;
for (tr=vot_getTR (tdata); tr; tr=vot_getNext(tr)) {
acref = vot_getTableCell (tdata, i, acol);
if (tcol >= 0) {
char *format = vot_getTableCell (tdata, i, tcol);
if (format && fmt && strcasestr (format, fmt) == NULL)
continue;
}
vot_saveAcref (acref, i, filenum++);
nfiles++;
tnum++;
i++;
}
}
/* Clean up.
*/
if (afd) /* close the acref file */
fclose (afd);
vot_closeVOTABLE (vot);
return (nfiles);
}
/**
* VOT_SAVEACREF -- Save the URL to the access list.
*/
static void
vot_saveAcref (char *acref, int num, int fnum)
{
if (afd)
fprintf (afd, "%s\n", acref);
else if (extract)
fprintf (stderr, "%s\n", acref);
else {
/* Save to the access list.
*/
aclist[num].tnum = ((nthreads == 1) ? 0 : (num % nthreads));
strcpy (aclist[num].url, acref);
if (seq)
sprintf (aclist[num].fname, "%s%04d", base, (int) fnum);
else
sprintf (aclist[num].fname, "%s%d", base, vot_sum32 (acref));
}
}
/**
* VOT_ISVOTABLE -- Determine in the input file is a VOTable or URL @file.
* We return zero if the file cannot be parsed as a valid VOTable (i.e.
* we assume it is an @file of URLs), or else we return the root handle to
* the parsed file.
*/
#define SZ_READ 2880
static int
vot_isVOTable (char *infile)
{
FILE *fd = (FILE *) NULL;
char buf[SZ_READ], fname[SZ_READ];
register int nread;;
memset (fname, 0, SZ_READ);
if (strncmp (infile, "file://", 7) == 0)
strcpy (fname, &infile[7]);
else
strcpy (fname, infile);
/* read the first 1024 bytes and search for a 'votable' string... */
if (access (fname, F_OK) < 0) {
if (verbose)
fprintf (stderr, "Error: Cannot open input file '%s'\n", fname);
return (-1);
} else if ((fd = fopen (fname, "r"))) {
memset (buf, 0, SZ_READ);
nread = fread (buf, sizeof (char), SZ_READ, fd);
fclose (fd);
return (strcasestr (buf, "votable") ? 1 : 0);
}
return ( 0 );
}
/**
* VOT_ACREFCOLUMN -- Determine the access column for the given table.
*/
static int
vot_acrefColumn (handle_t tab)
{
register int i = 0, acol = -1;
handle_t field;
char *ucd;
/* Loop through the FIELDs to find the acref.
*/
for (field=vot_getFIELD(tab); field; field=vot_getNext(field),i++) {
ucd = vot_getAttr (field, "ucd");
if (ucd && strcasecmp (acref_ucd, ucd) == 0) {
acol = i;
break;
}
}
if (acol < 0) { /* make sure we found a column */
if (verbose)
fprintf (stderr, "Error: no acref column found (%s)\n", acref);
return (-1);
}
return (acol);
}
/**
* VOT_TYPECOLUMN -- Determine the type column for the given table.
*/
static int
vot_typeColumn (handle_t tab)
{
register int i = 0;
handle_t field;
char *ucd;
/* Loop through the FIELDs to find the type. Use a generous match.
*/
if (tcol < 0) {
for (field=vot_getFIELD(tab); field; field=vot_getNext(field),i++) {
ucd = vot_getAttr (field, "ucd");
if (ucd && strcasestr (ucd, fmt_ucd)) {
tcol = i;
break;
}
}
}
return (tcol);
}
/**
* VOT_GETACLIST -- Download all the files for the specified thread.
*/
static void *
vot_getAclist (void *arg)
{
register int i, j, done = 0, ret = 0;
int threadNum = 0;
if (arg)
threadNum = *(int *)arg;
for (i=0; i < nfiles; i++) {
if (aclist[i].tnum == threadNum) {
for (j=0; j < maxTrys; j++) {
if ((ret = vot_getData (aclist[i].url, aclist[i].fname)))
break;
}
done += ret;
}
}
/*
pthread_exit (NULL);
*/
return ((void *) NULL);
}
/**
* VOT_GETDATA -- Utility routine to do a simple URL download to the file.
*/
static int
vot_getData (char *url, char *ofname)
{
int stat = 0;
char lockfile[SZ_FNAME], dot[SZ_FNAME], errBuf[CURL_ERROR_SIZE];
char fname[SZ_FNAME], ffname[SZ_FNAME];
FILE *fd;
CURL *curl_handle;
/* FIXME */
if (extn)
sprintf (ffname, "%s.%s", ofname, extn);
else {
sprintf (ffname, "%s.fits", ofname);
}
if (access (ofname, F_OK) == 0 || access (ffname, F_OK) == 0) {
/* file already exists */
if (force)
unlink (ofname);
else
return (1);
}
/* Initialize the lock file.
*/
memset (lockfile, 0, SZ_FNAME);
memset (dot, 0, SZ_FNAME);
sprintf (lockfile, ".%s.LOCK", ofname);
sprintf (dot, ".%s", ofname);
if (access (lockfile, F_OK) == 0 && access (dot, F_OK) < 0) {
/* Download currently in progress, perhaps on another thread?
*/
return (0);
} else if (access (lockfile, F_OK) == 0 && access (dot, F_OK) == 0) {
/* Download complete, stray lockfile.
*/
unlink (lockfile);
} else if (access (lockfile, F_OK) < 0) {
/* No lock file, create one.
*/
creat (lockfile, O_CREAT);
}
/* Append filename extension if specified.
*/
if (extn)
sprintf (fname, "%s.%s", ofname, extn);
else
strcpy (fname, ofname);
/* For the CURL operation to download the file.
*/
curl_global_init (CURL_GLOBAL_ALL); /* init curl session */
curl_handle = curl_easy_init ();
/* Open the output file.
*/
if ((fd = fopen (fname, "wb")) == NULL) {
if (verbose)
fprintf (stderr, "Error: cannot open output file '%s'\n", fname);
curl_easy_cleanup (curl_handle);
return 0;
}
/* Set cURL options
*/
curl_easy_setopt (curl_handle, CURLOPT_URL, url);
curl_easy_setopt (curl_handle, CURLOPT_NOPROGRESS, 1L);
curl_easy_setopt (curl_handle, CURLOPT_WRITEDATA, fd);
curl_easy_setopt (curl_handle, CURLOPT_ERRORBUFFER, errBuf);
curl_easy_setopt (curl_handle, CURLOPT_FOLLOWLOCATION, 1);
/* Do the download.
*/
if ((stat = curl_easy_perform (curl_handle)) != 0) {
/* Error in download, clean up.
*/
if (verbose)
fprintf (stderr, "Error: can't download '%s' : %s\n", url, errBuf);
unlink (fname); unlink (lockfile);
fclose (fd); /* close the file */
curl_easy_cleanup (curl_handle); /* cleanup curl stuff */
return (0);
}
fflush (fd);
fclose (fd); /* close the file */
curl_easy_cleanup (curl_handle); /* cleanup curl stuff */
/* Save the URL to a "dotfile" is we're downloading to a cache.
*/
if (isCache) {
if ((fd = fopen (dot, "w")) == NULL) { /* open cache file */
if (verbose)
fprintf (stderr, "Error: cannot open cache file '%s'\n", dot);