Linux Programming Question:: Get Free Disk Info (with path name if possible)

[vansky]

hi all,

as people known, we can use comm 'df' to get the disk info.

but i'd like to get the disk info included in a C/C++ file, could any
super guy help me with it?

thx a lot!

 

[Artie Gold]

hi all,

as people known, we can use comm 'df' to get the disk info.

but i'd like to get the disk info included in a C/C++ file, could any
super guy help me with it?

thx a lot!

Sure. Just ask in where your question would be
topical. Then sit down, popen a cold one and your answer will doubtless
be forthcoming.

--ag

 

[Rennie deGraaf]

hi all,

as people known, we can use comm 'df' to get the disk info.

but i'd like to get the disk info included in a C/C++ file, could any
super guy help me with it?

thx a lot!

You could use popen() (in <cstdio>) to execute df and pipe its output
into a stream, which you could then read in and parse.

Alternately, you could look at the source code for df and gather the
information in the same way that it does.

Rennie deGraaf

 

[vansky]

thx all,


the following way is From:: Artie Gold

#include <stdlib.h>
#include <stdio.h>


int main(void) {
FILE * df = popen("df", "r");
int c;
while ((c = fgetc(df)) != EOF)
putchar(c);
pclose(df);
return 0;

 

[bvatsa]

Can't u use system() function to achieve this,


main()
{

system("df");

}

Try this..

 

[Rennie deGraaf]

Can't u use system() function to achieve this,


main()
{

system("df");

}

Try this..

System() will execute the command and return its exit code, but won't
give you its output, which is what the OP is looking for. (At least not
without some trickery that would end up being more complicated than
using popen().)

Rennie deGraaf

 

[saldon]

See also: man 2 statfs if you want to do it manually

 

[vansky]

hi saldon,

i have tried statfs, that's also a great way!

btw, i got free blocks in fs with var f_bfree, also block size in
bytes is needed to convert blocks value to bytes value,

so, the question is: the funcs or global definition to get block
sizewhats ?

sort of stupid question,

 

[vansky]

hi saldon,


i have tried statfs, that's also a great way!


btw, i got free blocks in fs with var f_bfree, also block size in
bytes is needed to convert blocks value to bytes value,


so, the question is: whats the funcs or global definition to get block
size ??


sort of stupid question,

 

[vansky]

struct stats{
.....
f_bsize; /*optimal transfer block size */
.....
}

so sleepless these days...

but compared with "df -k", the value (f_bsize * f_bfree) is slightly
larger.