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I am writing a C program and trying to compile it under fedora9 when I type
gcc filename.c -o filename it suceeds but when I type ./filename.c it gives me Permission denied.
I am working in my code on threads basically using clone. Is there any relationship with this line
#define CLONE_VM 0x00000100
I don't have a clue what your program is supposed to do, but is it supposed to output anything (text?) to the screen when it executes? If not, then when you execute it, it will either run and exit silently, or run and exit with an error.
As for when you type ./filename.c you are in effect trying to execute a text file. "Permission denied" happens most likely because the file is not set with "execute" bit. If you do the command:
shell$ chmod a+x filename.c
then it will be executable, but there's no point; it won't run, because it's a .c source code file (a text file, not a shell executable or binary).
Like Jim mentioned above, your compiled binary should be called "filename"; that's what you want to execute after the source has been compiled.