|TMPNAM(3)||Linux Programmer's Manual||TMPNAM(3)|
NAME¶tmpnam - create a name for a temporary file
#include <stdio.h> char *tmpnam(char *s);
DESCRIPTION¶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 generated 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 character array (of length at least L_tmpnam) pointed at by s and the value s is returned in case of success.
The path name 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.)
RETURN VALUE¶The tmpnam() function returns a pointer to a unique temporary filename, or NULL if a unique name cannot be generated.
ERRORS¶No errors are defined.
NOTES¶Portable applications that use threads cannot call tmpnam() with NULL parameter if either _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS is defined.
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 behaviour is implementation defined.
BUGS¶Never use this function. Use mkstemp(3) instead.
CONFORMING TO¶SVID 2, POSIX, BSD 4.3, ISO 9899
SEE ALSO¶mktemp(3), mkstemp(3), tempnam(3), tmpfile(3)
|14 June 1999|