mirror of https://github.com/mkerrisk/man-pages
101 lines
3.3 KiB
Plaintext
101 lines
3.3 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
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.TH "TMPNAM" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.\" tmpnam
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.SH NAME
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tmpnam \- create a name for a temporary file
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.SH SYNOPSIS
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.LP
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\fB#include <stdio.h>
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.br
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.sp
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char *tmpnam(char *\fP\fIs\fP\fB);
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.br
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\fP
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.SH DESCRIPTION
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.LP
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The \fItmpnam\fP() function shall generate a string that is a valid
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filename and that is not the same as the name of an
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existing file. The function is potentially capable of generating {TMP_MAX}
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different strings, but any or all of them may already be
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in use by existing files and thus not be suitable return values.
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.LP
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The \fItmpnam\fP() function generates a different string each time
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it is called from the same process, up to {TMP_MAX} times.
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If it is called more than {TMP_MAX} times, the behavior is implementation-defined.
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.LP
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The implementation shall behave as if no function defined in this
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volume of IEEE\ Std\ 1003.1-2001 calls
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\fItmpnam\fP().
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.LP
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If
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the application uses any of the functions guaranteed to be available
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if either _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS is
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defined, the application shall ensure that the \fItmpnam\fP() function
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is called with a non-NULL parameter.
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.SH RETURN VALUE
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.LP
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Upon successful completion, \fItmpnam\fP() shall return a pointer
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to a string. If no suitable string can be generated, the
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\fItmpnam\fP() function shall return a null pointer.
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.LP
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If the argument \fIs\fP is a null pointer, \fItmpnam\fP() shall leave
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its result in an internal static object and return a
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pointer to that object. Subsequent calls to \fItmpnam\fP() may modify
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the same object. If the argument \fIs\fP is not a null
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pointer, it is presumed to point to an array of at least L_tmpnam
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\fBchar\fPs; \fItmpnam\fP() shall write its result in that
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array and shall return the argument as its value.
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.SH ERRORS
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.LP
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No errors are defined.
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.LP
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\fIThe following sections are informative.\fP
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.SH EXAMPLES
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.SS Generating a Filename
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.LP
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The following example generates a unique filename and stores it in
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the array pointed to by \fIptr\fP.
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.sp
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.RS
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.nf
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\fB#include <stdio.h>
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\&...
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char filename[L_tmpnam+1];
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char *ptr;
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.sp
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ptr = tmpnam(filename);
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\fP
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.fi
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.RE
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.SH APPLICATION USAGE
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.LP
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This function only creates filenames. It is the application's responsibility
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to create and remove the files.
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.LP
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Between the time a pathname is created and the file is opened, it
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is possible for some other process to create a file with the
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same name. Applications may find \fItmpfile\fP() more useful.
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.SH RATIONALE
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.LP
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None.
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.SH FUTURE DIRECTIONS
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.LP
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None.
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.SH SEE ALSO
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.LP
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\fIfopen\fP() , \fIopen\fP() , \fItempnam\fP() ,
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\fItmpfile\fP() , \fIunlink\fP() , the Base Definitions volume of
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IEEE\ Std\ 1003.1-2001, \fI<stdio.h>\fP
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group. In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.opengroup.org/unix/online.html .
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