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The important things to note with this file are the function definitions For both functions, you are no longer mapping directly between the supported C function, statvfs(), and its identical cousin in Perl, statvfs Instead, you are creating brand-new functions that act as wrappers around the underlying calls to the statvfs() C function You no longer rely on XS to do the translation, because the underlying function you are calling returns a C structure, not a single value C doesn t support multiple return values, so you need to do some manipulation of the information returned in order to translate it into a simple list of values For the fsavail function, you rely on the XS system to convert between the long that you ve stated as the return value, and a normal integer value within Perl You assign the return value to a special variable, RETVAL, and then mark that variable with the OUTPUT: keyword as the value to be returned to Perl when this function is called For the fsstat function, you do this conversion within a PPCODE block, which tells the XS interface builder that you are manipulating the contents of the Perl stack directly, rather than supplying a return value The first few steps create the required C structures and then call the statvfs() library function to populate the structure with the information you want In addition to the PPCODE: definition, you also need to ensure

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that the function is defined as void, since you are not directly returning any values from the function Then you push values onto the Perl argument stack with the PUSHs function, which you saw in the section Stack Access for Embedded Perl, earlier in this chapter This pushes a scalar value in this case, an integer onto the stack You could (and perhaps should) have used the XPUSHs function, to ensure that the stack was extended accordingly For only three values, we re probably safe with PUSHs Note that the calculated values are encapsulated within a call to newSViv, which creates a new integer scalar value; and sv_2mortal, which marks the scalar value as mortal, allowing it to be deleted when the whole process has finished This helps prevent memory problems by freeing up values after they have been used you have no need for those temporary values in the calculation Also note that error checking is supported in the fsstat by returning an empty list, the default return value on an error; fsavail returns 1 on an error, also the default operation when calling external system functions Remember that you can t use 0 as a return value, because that could equally indicate that there was no available space on the drive For reference, the format for the statvfs C structure is shown here:

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typedef struct statvfs { u_long f_bsize; /* fundamental file system block size */ u_long f_frsize; /* fragment size */ u_long f_blocks; /* total # of blocks of f_frsize on fs */ u_long f_bfree; /* total # of free blocks of f_frsize */ u_long f_bavail; /* # of free blocks avail to non-root */ u_long f_files; /* total # of file nodes (inodes) */ u_long f_ffree; /* total # of free file nodes */ u_long f_favail; /* # of free nodes avail to non-superuser */ u_long f_fsid; /* file system id (dev for now) */ char f_basetype[FSTYPSZ]; /* target fs type name */ u_long f_flag; /* bit-mask of flags */ u_long f_namemax; /* maximum file name length */ char f_fstr[32]; /* filesystem-specific string */ u_long f_filler[16]; /* reserved for future expansion */ } statvfs_t;

Again, the process is relatively straightforward If you know how to program in C, you should be able to create and access the necessary structures and use the techniques shown here to produce a customized interface to a C function Of course, there is no reason to use and translate values determined by an external function; you could use the CODE or PPCODE block to define your C function without requiring an external function at all

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You ve already seen some of the keywords used by the XS system to indicate different operations and situations The full list is given here, including all the currently supported keywords and operations As a general rule, all keywords with a trailing colon expect some form of argument, statement, or code block following them Keywords without a trailing colon are generally assigned to (as with RETVAL), or assign values or options to an existing statement (as in NO_INIT) The exact location and use of these varies, so ensure you understand the descriptions and locations given

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