Why is tmpfile returning my stderr message?

steals10304 · 11-07-2009, 12:14 AM

Code:

FILE *OpenTemporaryFile(void)
{
  FILE *pFile;
  if((pFile = tmpfile()) == NULL)
  {
     fprintf(stderr, "Cant open temp file\n");
     exit(EXIT_FAILURE);
  }
  return pFile;
}

I'm a novice coder, but I'm pretty sure I've coded this correctly? Help?

nadroj · 11-07-2009, 12:20 AM

Seems to work fine for me. Can you try to re-compile and run it again?

grumpy · 11-07-2009, 03:50 AM

tmpfile() is presumably failing on your system. The reasons vary between systems (eg with operating system, compiler/library, and resources available on your system).

A common reason for failure is that files cannot be created in the current working directory. Reasons that might occur vary, but include a working directory that does not exist, a working directory on a hard drive with no spare space, and things like that.

Another common reason is that your program already has several file handles already open, sufficient that some quota (eg set by an administrator, or a default operating system limit) is exceeded.

Without information on the code that is calling your function, or the system on which your program is running, it is not possible to give a more specific response.

11-07-2009, 12:14 AM	#1
steals10304 Registered User Join Date: Aug 2009 Posts: 30	Why is tmpfile returning my stderr message? Code: FILE OpenTemporaryFile(void) { FILE pFile; if((pFile = tmpfile()) == NULL) { fprintf(stderr, "Cant open temp file\n"); exit(EXIT_FAILURE); } return pFile; } I'm a novice coder, but I'm pretty sure I've coded this correctly? Help?
steals10304 is offline

11-07-2009, 12:20 AM	#2
nadroj Registered User Join Date: Oct 2006 Location: Canada Posts: 848	Seems to work fine for me. Can you try to re-compile and run it again?
nadroj is offline

11-07-2009, 03:50 AM	#3
grumpy Registered User Join Date: Jun 2005 Posts: 1,343	tmpfile() is presumably failing on your system. The reasons vary between systems (eg with operating system, compiler/library, and resources available on your system). A common reason for failure is that files cannot be created in the current working directory. Reasons that might occur vary, but include a working directory that does not exist, a working directory on a hard drive with no spare space, and things like that. Another common reason is that your program already has several file handles already open, sufficient that some quota (eg set by an administrator, or a default operating system limit) is exceeded. Without information on the code that is calling your function, or the system on which your program is running, it is not possible to give a more specific response. __________________ Right 98% of the time, and don't care about the other 3%.
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