12-02-2005
Aha - After Googling to find out what mkstemp is, I've discovered that the error is due to the file name length. Shortening the file name has solved the problem - the temp file name with the .XXXXXX extension must have been pushing it over the OS's file name length limit. (I guess)
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LEARN ABOUT REDHAT
mkstemp
MKSTEMP(3) Linux Programmer's Manual MKSTEMP(3)
NAME
mkstemp - create a unique temporary file
SYNOPSIS
#include <stdlib.h>
int mkstemp(char *template);
DESCRIPTION
The mkstemp() function generates a unique temporary file name from template. The last six characters of template must be XXXXXX and these
are replaced with a string that makes the filename unique. The file is then created with mode read/write and permissions 0666 (glibc 2.0.6
and earlier), 0600 (glibc 2.0.7 and later). Since it will be modified, template must not be a string constant, but should be declared as a
character array. The file is opened with the O_EXCL flag, guaranteeing that when mkstemp returns successfully we are the only user.
RETURN VALUE
The mkstemp() function returns the file descriptor fd of the temporary file or -1 on error.
ERRORS
EINVAL The last six characters of template were not XXXXXX. Now template is unchanged.
EEXIST Could not create a unique temporary filename. Now the contents of template are undefined.
NOTES
The old behaviour (creating a file with mode 0666) may be a security risk, especially since other Unix flavours use 0600, and somebody
might overlook this detail when porting programs.
More generally, the POSIX specification does not say anything about file modes, so the application should make sure its umask is set appro-
priately before calling mkstemp.
CONFORMING TO
BSD 4.3, POSIX 1003.1-2001
NOTE
The prototype is in <unistd.h> for libc4, libc5, glibc1; glibc2 follows the Single Unix Specification and has the prototype in <stdlib.h>.
SEE ALSO
mkdtemp(3), mktemp(3), tmpnam(3), tempnam(3), tmpfile(3)
GNU
2001-12-23 MKSTEMP(3)