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From:	Alex Reynolds <alexpreynolds AT gmail DOT com>
Subject:	error: mkstemp was not declared in this scope
Date:	Mon, 13 Jan 2014 13:32:20 -0800
Message-Id:	<F9A2DD7F-D2D0-4F7D-9129-3A0805FC8DEF@gmail.com>
Cc:	Alex Reynolds <alexpreynolds AT gmail DOT com>
To:	cygwin AT cygwin DOT com
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I am running Cygwin 1.7.27 (0.271/5/3) and g++ 4.8.2. 

I am testing attempts to make temporary files in a POSIX-compliant way, using mkstemp().

I get the following error when I compile code that calls mkstemp():

-----------------------------------------
$ g++ -Wall -ansi -pedantic foo.cpp
foo.cpp: In function ‘int main()’:
foo.cpp:44:21: error: ‘mkstemp’ was not declared in this scope
-----------------------------------------

Here is my code:

-----------------------------------------
#
# foo.cpp
#

#include <stdio.h>
#include <cstdlib>
#include <unistd.h>
#include <sys/stat.h>
#include <cstring>

#ifndef P_tmpdir
#ifdef _P_tmpdir
#define P_tmpdir _P_tmpdir  /* MingW */
#else
#define P_tmpdir "/tmp"
#endif
#endif

int main ()
{
 char const* p = getenv("TMPDIR");
 if ( p == NULL )
   p = P_tmpdir;
 printf("%s\n", p);

 int fd;
 char* tmpl = (char*)malloc(1 + strlen(p) + L_tmpnam);
 printf("%d\n", L_tmpnam);
 printf("%ld\n", strlen(p) + L_tmpnam);
 strcpy(tmpl, p);
 strcpy(tmpl+strlen(p), "/sb.XXXXXX");
 printf("%s\n", tmpl);

 mkdir(p, 0700); // ignoring return val... mkstemp will fail if directory isn't writable
 if ( (fd = mkstemp(tmpl)) == -1 ) {
   fprintf(stderr, "unable to create temp file!\n");
   return EXIT_FAILURE;
 }
 printf("%s\n", tmpl);

 printf("%d\n", remove(tmpl));
 printf("%d\n", remove("this-aint-no-file"));

 free(tmpl);

 return EXIT_SUCCESS;
}
-----------------------------------------

Is mkstemp() part of Cygwin? If not, what options would I have to replace this code with equivalent functionality?

Thanks,
Alex
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