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/*
* Copyright (c) 1989 University of Maryland
* Department of Computer Science. All rights reserved.
* Permission to copy for any purpose is hereby granted
* so long as this copyright notice remains intact.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _AMIGA
#define getpid() 42
#endif /* _AMIGA */
#if defined( WIN32 ) || defined( _AMIGA )
#include "types.h"
#else
#include <sys/file.h>
char *getenv();
#endif
#include "tempfile.h"
#ifdef KPATHSEA
#include <kpathsea/c-fopen.h>
#else
#ifndef O_BINARY
#define O_BINARY 0
#endif
#endif
#if defined(WIN32) || defined(MSDOS)
#define TMP_OPEN_MODE (O_RDWR | O_BINARY)
#else
#define TMP_OPEN_MODE 2
#endif
#ifdef DOSISH
#ifndef WIN32
#define __cdecl
#endif
static char *TmpFile;
static void __cdecl
RemoveTempFile(void)
{
if (TmpFile) {
unlink(TmpFile);
TmpFile = (char *)0;
}
}
#endif
/*
* Create an open but unlinked (i.e., remove-on-exit-or-file-close)
* file. Return the file descriptor, or -1 if unable to create such
* a file. The buffer `name' is used to hold the file name (so that
* if this returns -1, it is useful for error messages).
*
* We use the despicable trick of unlinking an open temporary file.
* The alternatives are too painful. If it becomes necessary to
* do this another way, however, here is a method suggested by Fred
* Blonder: fork, and have the parent wait for the child to exit.
* (The parent must avoid being killed during this phase.) When
* the child exits, the parent should then remove the temporary file,
* then exit with the same status, or send itself the same signal.
*/
int
MakeRWTempFile(char *name)
{
register int tf, n;
int mypid, tries;
const char *tmpdir;
if ((tmpdir = getenv("TMP")) == NULL
&& (tmpdir = getenv("TEMP")) == NULL
&& (tmpdir = getenv("TMPDIR")) == NULL)
#if defined(WIN32) || defined(MSDOS)
tmpdir = ".";
#else
tmpdir = "/tmp";
#endif
/* compose a suitable temporary file name, and get an r/w descriptor */
mypid = getpid();
n = 0;
tries = 0;
do {
(void) sprintf(name, "%s/#%d.%d", tmpdir, mypid, n++);
#ifndef DOSISH
(void) unlink(name);
#endif
#ifdef O_CREAT /* have three-argument open syscall */
tries++;
tf = open(name, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0666);
#else
if (access(name, 0) == 0) {
/*
* Skip existing files. Note that tf might
* not be set yet.
*/
tf = -1;
continue;
}
tries++;
tf = creat(name, 0666);
if (tf >= 0) {
(void) close(tf);
tf = open(name, TMP_OPEN_MODE);
if (tf < 0)
(void) unlink(name);
}
#endif
} while (tf < 0 && tries < 20);
if (tf < 0) /* probably unrecoverable user error */
return (-1);
#ifdef DOSISH
/* Can't use the despicable trick of unlinking an open file,
since the filesystem won't wait for it to be closed. Let's
be somewhat less despicable. */
TmpFile = (char *)malloc(strlen(name) + 1);
if (TmpFile) {
strcpy(TmpFile, name);
atexit(RemoveTempFile);
}
#else
(void) unlink(name);
#endif
return (tf);
}
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