How to get free disk space size in C/C++ program( Solaris system) Post: 302086263

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Top Forums Programming How to get free disk space size in C/C++ program( Solaris system) Post 302086263 by vrghost on Wednesday 23rd of August 2006 09:30:25 AM

08-23-2006

Registered User

Needed to write something to get information from the disks and send it to a web app, so here is the code (the html stuff removed), this should give you the info (works on our AIX servers atleast). Only thing is it does give a slightly higher free space value than df, not certain what is causing it.

Code:

/*
################################################################################
##                              diskstat.c                                    ##
################################################################################
## diskstat returns (or will soon return to be more precice) webified diskstat for specific disk, should change to     ##
## XML'ified info at some point.....                                          ##
################################################################################
*/

#include <sys/statvfs.h>

int main( int argc, char *argv[] )
{
        struct statvfs fiData;
        struct statvfs *fpData;
        char fnPath[128];
        int i;

        if( argc < 2 ) {
                printf("Usage, webdisk DEVICE0 ..... DEVICEX\n");
                return(2);
        }

        //Lets loopyloop through the argvs
        for( i = 1 ; i<argc; i++ ) {
                strcpy(fnPath, argv[i]);
                if((statvfs(fnPath,&fiData)) < 0 ) {
                        printf("Failed to stat %s:\n", fnPath);
                } else {
                        printf("Disk %s: \n", fnPath);
                        printf("\tblock size: %u\n", fiData.f_bsize);
                        printf("\ttotal no blocks: %i\n", fiData.f_blocks);
                        printf("\tfree blocks: %i\n", fiData.f_bfree);
                }
        }
}

For the other members of the struct, check sys/statvfs.h.

Just compile and send it the mountpoint of the disk.
So for example ./a.out /

BTW Thanks blowtorch for pointing me in the right direction whith statvls.

vrghost

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LEARN ABOUT OSF1

statvfs

statvfs(2)							System Calls Manual							statvfs(2)

NAME

       statvfs, fstatvfs - Gets file system information

SYNOPSIS

       #include <sys/statvfs.h>

       int statvfs (	  const char *path,	 struct statvfs *buffer );

       int fstatvfs (	   int file_descriptor,      struct statvfs *buffer );

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       fstatvfs():  POSIX.1, XSH5.0

       statvfs():  POSIX.1, XSH5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies  any  file  within  the  mounted  file  system.  Specifies a file descriptor obtained by a successful open() or fcntl() function.
       Points to a statvfs buffer to hold the returned information for the statvfs() or fstatvfs() function.

DESCRIPTION

       The statvfs() and fstatvfs() functions return descriptive information about a mounted file system.  The returned information is in the for-
       mat of a statvfs structure, which is defined in the sys/statvfs.h header file.

RETURN VALUES

       Upon successful completion, either function returns 0 (zero).  Otherwise, it returns -1, sets errno to indicate the error.

       If  the	statvfs() function fails, errno may be set to one of the following values: Search permission is denied for a component of the path
       prefix [Tru64 UNIX]  The requested address is invalid.  An I/O error occurred while reading the file system.  A signal  was  caught  during
       execution  of the function.  [Tru64 UNIX]  The value returned by statvfs is invalid.  Too many symbolic links were encountered in translat-
       ing the path parameter detected.  The length of a component of the path parameter exceeds NAME_MAX characters, or the length  of  the  path
       parameter  exceeds  PATH_MAX characters.  The file referred to by the path parameter does not exist.  A component of the path prefix of the
       path parameter is not a directory.

       If the fstatvfs() function fails, errno may be set to the following values: The file descriptor parameter is not a valid  file  descriptor.
       [Tru64 UNIX]  The requested address is invalid.	[Tru64 UNIX]  The value returned by fstatvfs is invalid.

RELATED INFORMATION

       Functions: stat(2)

       Standards: standards(5) delim off

																	statvfs(2)

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