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来自「Algorithms for Image Processing and Comp」· 代码 · 共 89 行

@c ----------------------------------------------------------------------
@node tell, io
@heading @code{tell}
@subheading Syntax

@example
long tell(int file);
@end example

@subheading Description

This function returns the location of the file pointer for @var{file}. 

@subheading Return Value

The file pointer, or -1 on error.

@subheading Example

@example
long q = tell(fd);
@end example

@c ----------------------------------------------------------------------
@node telldir, file system
@heading @code{telldir}
@subheading Syntax

@example
#include <dirent.h>

long telldir(DIR *dir);
@end example

@subheading Description

This function returns a value which indicates the position of the
pointer in the given directory.  This value is only useful as an
argument to @code{seekdir} (@pxref{seekdir}). 

@subheading Return Value

The directory pointer.

@subheading Example

@example
DIR *dir;
long q = telldir(dir);
do_something();
seekdir(dir, q);
@end example

@c ----------------------------------------------------------------------
@node tempnam, stdio
@heading @code{tempnam}
@subheading Syntax

@example
#include <stdio.h>

char *tempnam(const char *dir, const char *prefix);
@end example

@subheading Description

This function returns a temporary file name in a buffer allocated by
@code{malloc}.  The locations and filenames searched for temporary space
are as follows:

@example
getenv("TMPDIR")/@var{prefix}??????
@var{dir}/@var{prefix}??????
@code{P_tmpdir}/@var{prefix}??????
/tmp/@var{prefix}??????
@end example

@subheading Return Value

A pointer to the file name, or NULL if error.

@subheading Example

@example
char *fn = tempnam(".", "dj");
free(fn);
@end example