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/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*/
#include "android/utils/tempfile.h"
#include "android/utils/bufprint.h"
#include "android/utils/debug.h"
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#else
# include <unistd.h>
#endif
#define D(...) ((void)0)
/** TEMP FILE SUPPORT
**
** simple interface to create an empty temporary file on the system.
**
** create the file with tempfile_create(), which returns a reference to a TempFile
** object, or NULL if your system is so weird it doesn't have a temporary directory.
**
** you can then call tempfile_path() to retrieve the TempFile's real path to open
** it. the returned path is owned by the TempFile object and should not be freed.
**
** all temporary files are destroyed when the program quits, unless you explicitely
** close them before that with tempfile_close()
**/
struct TempFile
{
const char* name;
TempFile* next;
};
static void tempfile_atexit();
static TempFile* _all_tempfiles;
TempFile*
tempfile_create( void )
{
TempFile* tempfile;
const char* tempname = NULL;
#ifdef _WIN32
char temp_namebuff[MAX_PATH];
char temp_dir[MAX_PATH];
char *p = temp_dir, *end = p + sizeof(temp_dir);
UINT retval;
p = bufprint_temp_dir( p, end );
if (p >= end) {
D( "TEMP directory path is too long" );
return NULL;
}
retval = GetTempFileName(temp_dir, "TMP", 0, temp_namebuff);
if (retval == 0) {
D( "can't create temporary file in '%s'", temp_dir );
return NULL;
}
tempname = temp_namebuff;
#else
#define TEMPLATE "/tmp/.android-emulator-XXXXXX"
int tempfd = -1;
char template[512];
char *p = template, *end = p + sizeof(template);
p = bufprint_temp_file( p, end, "emulator-XXXXXX" );
if (p >= end) {
D( "Xcannot create temporary file in /tmp/android !!" );
return NULL;
}
D( "template: %s", template );
tempfd = mkstemp( template );
if (tempfd < 0) {
D("cannot create temporary file in /tmp/android !!");
return NULL;
}
close(tempfd);
tempname = template;
#endif
tempfile = malloc( sizeof(*tempfile) + strlen(tempname) + 1 );
tempfile->name = (char*)(tempfile + 1);
strcpy( (char*)tempfile->name, tempname );
tempfile->next = _all_tempfiles;
_all_tempfiles = tempfile;
if ( !tempfile->next ) {
atexit( tempfile_atexit );
}
return tempfile;
}
const char*
tempfile_path(TempFile* temp)
{
return temp ? temp->name : NULL;
}
void
tempfile_close(TempFile* tempfile)
{
#ifdef _WIN32
DeleteFile(tempfile->name);
#else
unlink(tempfile->name);
#endif
}
/** TEMP FILE CLEANUP
**
**/
/* we don't expect to use many temporary files */
#define MAX_ATEXIT_FDS 16
typedef struct {
int count;
int fds[ MAX_ATEXIT_FDS ];
} AtExitFds;
static void
atexit_fds_add( AtExitFds* t, int fd )
{
if (t->count < MAX_ATEXIT_FDS)
t->fds[t->count++] = fd;
else {
dwarning("%s: over %d calls. Program exit may not cleanup all temporary files",
__FUNCTION__, MAX_ATEXIT_FDS);
}
}
static void
atexit_fds_del( AtExitFds* t, int fd )
{
int nn;
for (nn = 0; nn < t->count; nn++)
if (t->fds[nn] == fd) {
/* move the last element to the current position */
t->count -= 1;
t->fds[nn] = t->fds[t->count];
break;
}
}
static void
atexit_fds_close_all( AtExitFds* t )
{
int nn;
for (nn = 0; nn < t->count; nn++)
close(t->fds[nn]);
}
static AtExitFds _atexit_fds[1];
void
atexit_close_fd(int fd)
{
if (fd >= 0)
atexit_fds_add(_atexit_fds, fd);
}
void
atexit_close_fd_remove(int fd)
{
if (fd >= 0)
atexit_fds_del(_atexit_fds, fd);
}
static void
tempfile_atexit( void )
{
TempFile* tempfile;
atexit_fds_close_all( _atexit_fds );
for (tempfile = _all_tempfiles; tempfile; tempfile = tempfile->next)
tempfile_close(tempfile);
}
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