3. Library calls (functions within program libraries)
TMPFILESection: Linux Programmer's Manual (3)
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NAMEtmpfile - create a temporary file
#include <stdio.h> FILE *tmpfile(void);
DESCRIPTIONThe tmpfile() function opens a unique temporary file in binary read/write (w+b) mode. The file will be automatically deleted when it is closed or the program terminates.
RETURN VALUEThe tmpfile() function returns a stream descriptor, or NULL if a unique filename cannot be generated or the unique file cannot be opened. In the latter case, errno is set to indicate the error.
- Search permission denied for directory in file's path prefix.
- Unable to generate a unique filename.
- The call was interrupted by a signal; see signal(7).
- The per-process limit on the number of open file descriptors has been reached.
- The system-wide limit on the total number of open files has been reached.
- There was no room in the directory to add the new filename.
- Read-only filesystem.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOPOSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD, SUSv2.
NOTESPOSIX.1-2001 specifies: an error message may be written to stdout if the stream cannot be opened.
The standard does not specify the directory that tmpfile() will use. Glibc will try the path prefix P_tmpdir defined in <stdio.h>, and if that fails the directory /tmp.
SEE ALSOexit(3), mkstemp(3), mktemp(3), tempnam(3), tmpnam(3)
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