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Full Discussion: Function Returning Value w/o return stmt
Top Forums Programming Function Returning Value w/o return stmt Post 302357092 by jim mcnamara on Monday 28th of September 2009 04:52:50 PM
Old 09-28-2009
First off, compile with gcc -Wall then it won't happen again if you pay attention to warnings. A good compile is zero warnings and zero errors, nothing else is acceptable.

When a function returns an int and nothing is returned by the function - then - whatever garbage data was living on the stack is what gets returned. ie., any value is possible. If your code looks like
Code:
int retval=0;
retval=myfunc();
if(retval)
   // good return
else
  // zero == error return

Then any garbage on the stack will result in a "good" return. This is called programming by coincidence, in polite circles, when it actually works.
 

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LEARN ABOUT CENTOS

vop_pathconf

VOP_PATHCONF(9) 					   BSD Kernel Developer's Manual					   VOP_PATHCONF(9)

NAME

     VOP_PATHCONF -- return POSIX pathconf information

SYNOPSIS

     #include <sys/param.h>
     #include <sys/vnode.h>
     #include <sys/unistd.h>

     int
     VOP_PATHCONF(struct vnode *vp, int name, int *retval);

DESCRIPTION

     The arguments are:

     vp      The vnode to get information about.

     name    The type of information to return.

     retval  The place to return the information.

     The value of name specifies what should be returned:

     _PC_LINK_MAX	   The maximum number of links to a file.

     _PC_NAME_MAX	   The maximum number of bytes in a file name.

     _PC_PATH_MAX	   The maximum number of bytes in a pathname.

     _PC_PIPE_BUF	   The maximum number of bytes which will be written atomically to a pipe.

     _PC_CHOWN_RESTRICTED  Return 1 if appropriate privileges are required for the chown(2) system call, otherwise 0.

     _PC_NO_TRUNC	   Return 1 if file names longer than KERN_NAME_MAX are truncated.

RETURN VALUES

     If name is recognized, *retval is set to the specified value and zero is returned, otherwise EINVAL is returned.

SEE ALSO

     pathconf(2), vnode(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD
								   July 24, 1996							       BSD
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