tmpnam man page on Archlinux

Man page or keyword search:  
man Server   11224 pages
apropos Keyword Search (all sections)
Output format
Archlinux logo
[printable version]

TMPNAM(3)		   Linux Programmer's Manual		     TMPNAM(3)

       tmpnam, tmpnam_r - create a name for a temporary file

       #include <stdio.h>

       char *tmpnam(char *s);

       Note: Avoid use of tmpnam(); use mkstemp(3) or tmpfile(3) instead.

       The  tmpnam()  function	returns	 a pointer to a string that is a valid
       filename, and such that a file with this name did  not  exist  at  some
       point  in  time, so that naive programmers may think it a suitable name
       for a temporary file.  If the argument s is NULL, this name  is	gener‐
       ated  in	 an  internal static buffer and may be overwritten by the next
       call to tmpnam().  If s is not NULL, the name is copied to the  charac‐
       ter array (of length at least L_tmpnam) pointed to by s and the value s
       is returned in case of success.

       The pathname that is created, has a directory prefix  P_tmpdir.	 (Both
       L_tmpnam	 and  P_tmpdir are defined in <stdio.h>, just like the TMP_MAX
       mentioned below.)

       The tmpnam() function returns a pointer to a unique temporary filename,
       or NULL if a unique name cannot be generated.

       No errors are defined.

   Multithreading (see pthreads(7))
       The  tmpnam()  function	is  thread-safe	 with  exceptions.   It is not
       thread-safe if called with a NULL parameter.

       The tmpnam_r() function is thread-safe.

       SVr4, 4.3BSD, C89, C99, POSIX.1-2001.  POSIX.1-2008 marks  tmpnam()  as

       The  tmpnam()  function	generates  a  different string each time it is
       called, up to TMP_MAX times.  If it is called more than TMP_MAX	times,
       the behavior is implementation defined.

       Although	 tmpnam()  generates  names that are difficult to guess, it is
       nevertheless possible that between the time  that  tmpnam()  returns  a
       pathname, and the time that the program opens it, another program might
       create that pathname using open(2), or create it as  a  symbolic	 link.
       This  can lead to security holes.  To avoid such possibilities, use the
       open(2)	O_EXCL	flag  to  open	the  pathname.	 Or  better  yet,  use
       mkstemp(3) or tmpfile(3).

       Portable applications that use threads cannot call tmpnam() with a NULL
       argument if either _POSIX_THREADS  or  _POSIX_THREAD_SAFE_FUNCTIONS  is

       A POSIX draft proposed to use a function tmpnam_r() defined by

	   char *
	   tmpnam_r(char *s)
	       return s ? tmpnam(s) : NULL;

       apparently  as  a warning not to use NULL.  A few systems implement it.
       To get a glibc prototype	 for  this  function  from  <stdio.h>,	define
       _SVID_SOURCE or _BSD_SOURCE (before including any header file).

       Never use this function.	 Use mkstemp(3) or tmpfile(3) instead.

       mkstemp(3), mktemp(3), tempnam(3), tmpfile(3)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

				  2014-02-27			     TMPNAM(3)

List of man pages available for Archlinux

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
Vote for polarhome
Free Shell Accounts :: the biggest list on the net