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/***********************************************************
* char *
* G_tempfile()
*
* returns a unique temporary (full path) file name
* these files are in a temp directory under the
* current mapset.
*
* successive calls will generate different names
* the names are of the form pid.n where pid is the
* programs process id number and n is a unique identifier
*
* returns:
* pointer to a character string containing the name.
* the name is copied to allocated memory and may be
* released by the unix free() routine.
*
* note:
* It is recommended to unlink() the tempfile on exit/error.
* Only if GRASS is left with 'exit', the GIS mapset manangement
* will clean up the temp directory (ETC/clean_temp)
***********************************************************/
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include "gis.h"
/*!
* \brief returns a temporary file name
*
* This routine
* returns a pointer to a string containing a unique file name that can be used
* as a temporary file within the module. Successive calls to G_tempfile() will
* generate new names.
* Only the file name is generated. The file itself is not created. To create the
* file, the module must use standard UNIX functions which create and open files,
* e.g., creat() or fopen().
* The programmer should take reasonable care to remove (unlink) the file before
* the module exits. However, GRASS database management will eventually remove
* all temporary files created by G_tempfile() that have been left behind by
* the modules which created them.
*
* \return char: pointer to a character string containing the name.
* the name is copied to allocated memory and may be
* released by the unix free() routine.
*/
char *G_tempfile(void)
{
return G__tempfile(getpid());
}
char *G__tempfile (int pid)
{
char path[1024];
char name[20];
char element[100];
static int uniq = 0;
struct stat st;
if (pid <= 0)
pid = getpid();
G__temp_element(element);
do
{
sprintf (name, "%d.%d", pid, uniq++) ;
G__file_name (path, element, name, G_mapset()) ;
}
while (stat(path, &st) == 0) ;
return G_store (path);
}
int G__temp_element(char *element)
{
char *machine;
strcpy (element, ".tmp");
machine = G__machine_name();
if (machine != NULL && *machine != 0)
{
strcat (element, "/");
strcat (element, machine);
}
G__make_mapset_element (element);
return 0;
}
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