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Full Discussion: fread: segementation fault(coredump) w/o stdlib.h
Top Forums Programming fread: segementation fault(coredump) w/o stdlib.h Post 302286560 by quintet on Wednesday 11th of February 2009 01:00:09 PM
Old 02-11-2009
fread: segementation fault(coredump) w/o stdlib.h
Hello All,

I tried to test a sample fread example to read a complete file
and the code is

Code:
#include <stdio.h>
#include <stdlib.h>
int main () {
  FILE * pFile;
  long lSize;
  char * buffer;
  size_t result;

  pFile = fopen ( "test.xml" , "rb" );
  if (pFile==NULL) {fputs ("File error",stderr); exit (1);}

  fseek (pFile , 0 , SEEK_END);
  lSize = ftell (pFile);
  rewind (pFile);

  buffer = (char*) malloc (sizeof(char)*lSize);
  if (buffer == NULL) {fputs ("Memory error",stderr); exit (2);}

  result = fread (buffer,1,lSize,pFile);
  if (result != lSize) {fputs ("Reading error",stderr); exit (3);}

  /* the whole file is now loaded in the memory buffer. */

  fclose (pFile);
  printf(" sizeof char :%d \n", sizeof(char));
  printf( "File: %s ", buffer);
  free (buffer);
  return 0;
}

The program worked as expected and the got the correct output.

After i removed #include <stdlib.h> from the program, it got compiled successfully but failed with the following message: Memory fault(coredump)

It failed in the fread command (checked with dbx).

Can anyone explain this behaviour?

I use AIX ver 5.

rgrds,
 

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LEARN ABOUT CENTOS

ftello

FTELL(3P)						     POSIX Programmer's Manual							 FTELL(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       ftell, ftello - return a file offset in a stream

SYNOPSIS

       #include <stdio.h>

       long ftell(FILE *stream);

       off_t ftello(FILE *stream);

DESCRIPTION

       The ftell() function shall obtain the current value of the file-position indicator for the stream pointed to by stream.

       The ftello() function shall be equivalent to ftell(), except that the return value is of type off_t.

RETURN VALUE

       Upon successful completion, ftell()  and ftello()  shall return the current value of the file-position indicator for the stream measured in
       bytes from the beginning of the file.

       Otherwise, ftell()  and ftello()  shall return -1, cast to long and off_t respectively, and set errno to indicate the error.

ERRORS

       The ftell()  and ftello()  functions shall fail if:

       EBADF  The file descriptor underlying stream is not an open file descriptor.

       EOVERFLOW
	      For ftell(), the current file offset cannot be represented correctly in an object of type long.

       EOVERFLOW
	      For ftello(), the current file offset cannot be represented correctly in an object of type off_t.

       ESPIPE The file descriptor underlying stream is associated with a pipe or FIFO.

       The ftell() function may fail if:

       ESPIPE The file descriptor underlying stream is associated with a socket.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fgetpos(), fopen(), fseek(), lseek(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								 FTELL(3P)
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