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Old 11-30-2005, 01:22 AM   #1
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What glibc command to query hard disk space?


Is there glib command to query local disk space (space used, space available)?
Old 11-30-2005, 03:27 AM   #2
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Or ... Is there any glibc or other kernel command/library exists to allow retrieval of hard disk information? I checked glibc doc and get commands to track processes, memory resources usage. But none for hard disk... I believe there should be some command...
Old 11-30-2005, 03:11 PM   #3
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There is afaik no simple function to return df type output, but see:
man 2 stat
man 2 statfs

statfs returns a pointer to struct which contains:
struct statfs {
     long    f_type;     /* type of filesystem (see below) */
     long    f_bsize;    /* optimal transfer block size */
     long    f_blocks;   /* total data blocks in file system */
     long    f_bfree;    /* free blocks in fs */
     long    f_bavail;   /* free blocks avail to non-superuser */
     long    f_files;    /* total file nodes in file system */
     long    f_ffree;    /* free file nodes in fs */
     fsid_t  f_fsid;     /* file system id */
     long    f_namelen;  /* maximum length of filenames */
(f_blocks - f_bfree) * f_bsize = free space

Old 11-30-2005, 03:56 PM   #4
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You could also try:

popen ("df -k", "r")

The advantage of "popen()" is that you can use it with any system command (df, netstat, ps, vmstat, etc etc)

'Hope that helps .. pSM


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