2004-11-03 13:51:07 +00:00
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.\" Copyright (C) 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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2007-04-12 22:42:49 +00:00
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.\"
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2004-11-03 13:51:07 +00:00
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 18:48:06 1993 by Rik Faith (faith@cs.unc.edu)
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.\" Modified Fri Jun 23 01:26:34 1995 by Andries Brouwer (aeb@cwi.nl)
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.\" (prompted by Scott Burkett <scottb@IntNet.net>)
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.\" Modified Sun Mar 28 23:44:38 1999 by Andries Brouwer (aeb@cwi.nl)
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.\"
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_exit.2, brk.2, capget.2, chdir.2, chmod.2, chown.2, chroot.2, getdtablesize.2, gethostname.2, getpagesize.2, getsid.2, killpg.2, mknod.2, mknodat.2, poll.2, posix_fadvise.2, pread.2, readlink.2, setpgid.2, setreuid.2, sigaltstack.2, stat.2, symlink.2, sync.2, truncate.2, vfork.2, wait.2, wait4.2, a64l.3, abs.3, acos.3, acosh.3, asin.3, asinh.3, atan.3, atan2.3, atoi.3, cbrt.3, ceil.3, copysign.3, cosh.3, dirfd.3, div.3, ecvt.3, erf.3, erfc.3, exp.3, exp2.3, fabs.3, fdim.3, ffs.3, floor.3, fma.3, fmax.3, fmin.3, fmod.3, fpclassify.3, frexp.3, ftw.3, fwide.3, gcvt.3, getcwd.3, getdate.3, getgrent.3, gethostid.3, getpass.3, getpwent.3, getsubopt.3, getw.3, hypot.3, ilogb.3, index.3, isalpha.3, isgreater.3, iswblank.3, j0.3, ldexp.3, lockf.3, log.3, log10.3, log1p.3, logb.3, lrint.3, lround.3, mkstemp.3, mktemp.3, modf.3, mq_receive.3, mq_send.3, nan.3, nextafter.3, posix_fallocate.3, posix_memalign.3, printf.3, qecvt.3, random.3, realpath.3, remainder.3, remquo.3, rint.3, round.3, scalb.3, scalbln.3, scanf.3, siginterrupt.3, signbit.3, sigset.3, sinh.3, sqrt.3, strcasecmp.3, strcat.3, strchr.3, strcmp.3, strcoll.3, strcpy.3, strfry.3, strpbrk.3, strsep.3, strspn.3, strstr.3, strtod.3, strtok.3, strtol.3, strtoul.3, strxfrm.3, tanh.3, tgamma.3, trunc.3, ttyslot.3, ualarm.3, usleep.3, wprintf.3, armscii-8.7, cp1251.7, iso_8859-10.7, iso_8859-11.7, iso_8859-13.7, iso_8859-14.7, iso_8859-3.7, iso_8859-5.7, iso_8859-6.7, iso_8859-8.7, koi8-u.7: tstamp
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-19 17:19:13 +00:00
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.TH MKTEMP 3 2010-09-20 "GNU" "Linux Programmer's Manual"
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2004-11-03 13:51:07 +00:00
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.SH NAME
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2006-02-12 22:15:41 +00:00
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mktemp \- make a unique temporary filename
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2004-11-03 13:51:07 +00:00
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.SH SYNOPSIS
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.nf
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.B #include <stdlib.h>
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.sp
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.BI "char *mktemp(char *" template );
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.fi
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2007-07-08 12:11:40 +00:00
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR mktemp ():
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2010-09-17 14:05:30 +00:00
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.ad l
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.PD 0
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2010-09-26 14:57:17 +00:00
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.RS 4
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2010-09-19 05:38:03 +00:00
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.TP 4
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2010-09-17 14:05:30 +00:00
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Since glibc 2.12:
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_BSD_SOURCE || _SVID_SOURCE ||
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2010-09-22 16:09:17 +00:00
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(_XOPEN_SOURCE\ >=\ 500 ||
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brk.2, chroot.2, vfork.2, ecvt.3, gcvt.3, getcwd.3, getpass.3, mktemp.3, posix_memalign.3, strdup.3, ttyslot.3, ualarm.3, usleep.3: ffix
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-26 15:46:36 +00:00
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_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED) &&
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brk.2, chroot.2, faccessat.2, fchmodat.2, fchownat.2, fstatat.2, futimesat.2, getdtablesize.2, getpagesize.2, getsid.2, linkat.2, mkdirat.2, mknodat.2, openat.2, pread.2, readlinkat.2, renameat.2, setpgid.2, sigaltstack.2, symlinkat.2, sync.2, timer_create.2, timer_delete.2, timer_getoverrun.2, timer_settime.2, unlinkat.2, utimensat.2, vfork.2, acosh.3, asinh.3, atanh.3, dirfd.3, dprintf.3, ecvt.3, expm1.3, fexecve.3, fmemopen.3, gcvt.3, getcwd.3, gethostid.3, getpass.3, getsubopt.3, getw.3, mbsnrtowcs.3, mkfifoat.3, mkstemp.3, mktemp.3, opendir.3, posix_memalign.3, rint.3, siginterrupt.3, stpcpy.3, stpncpy.3, strdup.3, strerror.3, strnlen.3, strsignal.3, strtol.3, strtoul.3, ualarm.3, usleep.3, wcpcpy.3, wcpncpy.3, wcscasecmp.3, wcsdup.3, wcsncasecmp.3, wcsnlen.3, wcsnrtombs.3: ffix
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-19 06:02:38 +00:00
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!(_POSIX_C_SOURCE\ >=\ 200112L || _XOPEN_SOURCE\ >=\ 600)
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2010-09-17 14:05:30 +00:00
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.TP
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Before glibc 2.12:
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2010-09-19 16:49:18 +00:00
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_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 500 ||
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brk.2, chroot.2, vfork.2, ecvt.3, gcvt.3, getcwd.3, getpass.3, mktemp.3, posix_memalign.3, strdup.3, ttyslot.3, ualarm.3, usleep.3: ffix
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-09-26 15:46:36 +00:00
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_XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
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2010-09-19 16:49:18 +00:00
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.RE
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2010-09-17 14:05:30 +00:00
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.PD
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.ad b
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2004-11-03 13:51:07 +00:00
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.SH DESCRIPTION
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2007-05-12 09:06:04 +00:00
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The
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.BR mktemp ()
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function generates a unique temporary filename
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2007-04-24 16:44:51 +00:00
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from \fItemplate\fP.
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The last six characters of \fItemplate\fP must
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2004-11-03 13:51:07 +00:00
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be XXXXXX and these are replaced with a string that makes the
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2007-04-12 22:42:49 +00:00
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filename unique.
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Since it will be modified,
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2004-11-03 13:51:07 +00:00
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.I template
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must not be a string constant, but should be declared as a character array.
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.SH "RETURN VALUE"
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2007-05-12 09:06:04 +00:00
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The
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.BR mktemp ()
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2007-06-25 07:50:51 +00:00
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function always returns \fItemplate\fP.
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If a unique name was created, the last six bytes of \fItemplate\fP will
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2004-11-03 13:51:07 +00:00
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have been modified in such a way that the resulting name is unique
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2007-06-25 07:50:51 +00:00
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(i.e., does not exist already)
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If a unique name could not be created,
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\fItemplate\fP is made an empty string.
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2004-11-03 13:51:07 +00:00
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.SH ERRORS
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.TP
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.B EINVAL
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The last six characters of \fItemplate\fP were not XXXXXX.
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.SH "CONFORMING TO"
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2006-05-23 23:58:25 +00:00
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4.3BSD, POSIX.1-2001.
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2008-08-06 12:26:00 +00:00
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POSIX.1-2008 removes the specification of
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.BR mktemp ().
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2007-05-16 02:54:18 +00:00
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.SH NOTES
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2004-11-03 13:51:07 +00:00
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The prototype is in
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.I <unistd.h>
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intro.1, time.1, accept.2, bind.2, connect.2, execve.2, flock.2, getdents.2, getpriority.2, getuid.2, intro.2, ioctl.2, mincore.2, mknod.2, personality.2, ptrace.2, read.2, recv.2, select_tut.2, send.2, sendfile.2, shmctl.2, sigaction.2, signal.2, stat.2, times.2, truncate.2, umask.2, wait.2, MB_CUR_MAX.3, MB_LEN_MAX.3, argz_add.3, btowc.3, clearenv.3, clock.3, cmsg.3, end.3, endian.3, errno.3, exit.3, fgetwc.3, fgetws.3, fopen.3, fputwc.3, fputws.3, fseek.3, fwide.3, getfsent.3, getgrnam.3, gethostid.3, getipnodebyname.3, getmntent.3, getpwnam.3, getwchar.3, grantpt.3, iconv.3, iconv_close.3, iconv_open.3, insque.3, intro.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, malloc.3, mblen.3, mbrlen.3, mbrtowc.3, mbsinit.3, mbsnrtowcs.3, mbsrtowcs.3, mbstowcs.3, mbtowc.3, mkstemp.3, mktemp.3, nl_langinfo.3, openpty.3, posix_openpt.3, printf.3, ptsname.3, putwchar.3, qecvt.3, rcmd.3, readdir.3, rexec.3, rpc.3, setnetgrent.3, shm_open.3, sigpause.3, stdin.3, stpcpy.3, strftime.3, strptime.3, syslog.3, towctrans.3, towlower.3, towupper.3, ttyslot.3, ungetwc.3, unlocked_stdio.3, wcpcpy.3, wcpncpy.3, wcrtomb.3, wcscasecmp.3, wcscat.3, wcschr.3, wcscmp.3, wcscpy.3, wcscspn.3, wcsdup.3, wcslen.3, wcsncasecmp.3, wcsncat.3, wcsncmp.3, wcsncpy.3, wcsnlen.3, wcsnrtombs.3, wcspbrk.3, wcsrchr.3, wcsrtombs.3, wcsspn.3, wcsstr.3, wcstok.3, wcstombs.3, wcswidth.3, wctob.3, wctomb.3, wctrans.3, wctype.3, wcwidth.3, wmemchr.3, wmemcmp.3, wmemcpy.3, wmemmove.3, wmemset.3, wprintf.3, console_ioctl.4, pts.4, elf.5, filesystems.5, hosts.5, proc.5, ttytype.5, boot.7, capabilities.7, credentials.7, epoll.7, glob.7, koi8-r.7, path_resolution.7, pty.7, signal.7, suffixes.7, time.7, unicode.7, unix.7, uri.7, utf-8.7: global fix: s/Unix/UNIX/
The man pages were rather inconsistent in the use of "Unix"
versus "UNIX". Let's go with the trademark usage.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-10-12 04:45:38 +00:00
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for libc4, libc5, glibc1; glibc2 follows the Single UNIX Specification
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2004-11-03 13:51:07 +00:00
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and has the prototype in
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.IR <stdlib.h> .
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.SH BUGS
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2007-05-12 09:06:04 +00:00
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Never use
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.BR mktemp ().
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2007-04-12 22:42:49 +00:00
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Some implementations follow 4.3BSD
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2005-07-18 16:02:32 +00:00
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and replace XXXXXX by the current process ID and a single letter,
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2004-11-03 13:51:07 +00:00
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so that at most 26 different names can be returned.
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Since on the one hand the names are easy to guess, and on the other
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hand there is a race between testing whether the name exists and
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2007-05-12 09:06:04 +00:00
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opening the file, every use of
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.BR mktemp ()
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is a security risk.
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2004-11-03 13:51:07 +00:00
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The race is avoided by
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.BR mkstemp (3).
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.SH "SEE ALSO"
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.BR mkstemp (3),
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.BR tempnam (3),
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.BR tmpfile (3),
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.BR tmpnam (3)
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