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Top Forums Programming Segmentation fault in fopen when in write mode. Post 302672711 by shoaibjameel123 on Monday 16th of July 2012 10:12:30 PM
Old 07-16-2012
I would agree with Corona688. I could not express this very well in my reply. My objective is to keep the values to 32bit ints only.

Alister has got the fundamentals right. yes, int32_t is typedef'ed to int. But I also recall that if on a 32bit architecture, one has to use a 64bit int, then one needs to explicitly specify int64_t.

---------- Post updated at 10:12 AM ---------- Previous update was at 09:48 AM ----------

I did try to run the code with the line:
Code:
printf("file_name reference on line %d = %p\n", __LINE__, file_name);

I get this as outputs,which makes me feel that file_name is not getting corrupted. Here is the result when I execute the code:

Code:
file_name reference on line 88 = (nil)
file_name reference on line 140 = 0x1d6ed830
file_name reference on line 305 = 0x1d6ed830
file_name reference on line 202 = 0x1d6ed830
file_name reference on line 206 = 0x1d6ed830
file_name reference on line 276 = 0x1d6ed830
file_name reference on line 209 = 0x1d6ed830
Segmentation fault (core dumped)

I even tested with this but still the program fails to execute:

Code:
output_pointer = fopen ( "1.dat" , "w" );

 

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BUILDER-CC(1)							 Debian GNU/Linux						     BUILDER-CC(1)

NAME
builder-cc - gcc wrapper to facilitate pentium-optimizations SYNOPSIS
export DEBIAN_BUILDARCH=architecture export DEBIAN_BUILDGCCVER=gcc-version gcc ... DESCRIPTION
The builder-cc wrapper is normally used by calling gcc as usual. If the environment variable DEBIAN_BUILDARCH is not set, builder-cc does nothing, and the real gcc is invoked with the specified arguments. When the DEBIAN_BUILDARCH environment variable is set, builder-cc invokes gcc with the specified arguments, plus -mcpu=DEBIAN_BUILDARCH -march=DEBIAN_BUILDARCH This has the effect of telling gcc to use architecture-specific optimizations without changing the command line. This is particularly useful for package builds. If DEBIAN_BUILDGCCVER is not set, builder-cc calls gcc.real. If DEBIAN_BUILDGCCVER is set, builder-cc calls gcc-DEBIAN_BUILDGCCVER instead. ENVIRONMENT
DEBIAN_BUILDARCH If set, the architecture to compile for. Useful values are pentium or pentiumpro. DEBIAN_BUILDGCCVER If set, the version of gcc to be invoked. Useful values are 3.0 or 2.95. NOTES
The real gcc is renamed gcc.real, and a diversion is registered with dpkg-divert(1). Thus builder-cc's idea of the default gcc is dictated by whatever package installed /usr/bin/gcc. SEE ALSO
gcc(1) Debian Project 2002-03-02 BUILDER-CC(1)
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