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/*******************************************************************/
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/* slibtool: a strong libtool implementation, written in C */
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/* Copyright (C) 2016--2024 SysDeer Technologies, LLC */
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/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#define _GNU_SOURCE
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#include <time.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include "slibtool_visibility_impl.h"
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#define PPRIX64 "%"PRIx64
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/* mkostemp might be guarded by non-standard macros */
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/* unless HAVE_NO_MKOSTEMP, assume it is available */
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extern int mkstemp(char *);
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extern int mkostemp(char *, int);
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/* __fs_tmpfile() atomically provides a private tmpfile */
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static int slbt_tmpfile_by_framework(void)
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{
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#ifdef _MIDIPIX_ABI
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extern int __fs_tmpfile(int);
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return __fs_tmpfile(O_CLOEXEC);
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#else
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return (-1);
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#endif
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}
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/* O_TMPFILE atomically provides a private tmpfile */
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static int slbt_tmpfile_by_kernel(void)
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{
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#ifdef O_TMPFILE
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return openat(AT_FDCWD,"/tmp",O_RDWR|O_TMPFILE|O_CLOEXEC,0);
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#else
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return (-1);
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#endif
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}
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/* mk{o}stemp() provides a non-private tmpfile */
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static int slbt_mkostemp(char * tmplate)
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{
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int fd;
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#ifdef HAVE_NO_MKOSTEMP
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if ((fd = mkstemp(tmplate)) >= 0)
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fcntl(fd,F_SETFD,FD_CLOEXEC);
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#else
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fd = mkostemp(tmplate,O_CLOEXEC);
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#endif
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return fd;
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}
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slbt_hidden int slbt_tmpfile(void)
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{
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int fd;
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void * addr;
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char tmplate[128];
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/* try with __fs_tmpfile() */
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if ((fd = slbt_tmpfile_by_framework()) >= 0)
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return fd;
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/* try with O_TMPFILE */
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if ((fd = slbt_tmpfile_by_kernel()) >= 0)
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return fd;
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/* fallback to mk{o}stemp */
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addr = tmplate;
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memset(tmplate,0,sizeof(tmplate));
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snprintf(tmplate,sizeof(tmplate),
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"/tmp/"
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".slibtool.tmpfile"
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".time."PPRIX64
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".salt.%p"
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".pid.%d"
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".XXXXXXXXXXXX",
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time(0),
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addr,
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getpid());
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return slbt_mkostemp(tmplate);
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}
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