QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
How do I know where my executables are being loaded from? |
| Ref. No. |
QNX.000009305 |
| Category(ies) |
Network, Development, Configuration |
| Issue |
I find my networked filesystem so transparent that sometimes I'm not even sure where executables are being loaded from! How do I get a better sense of where things are?
|
| Solution |
The fsys_get_mount dev() function returns the physical device that a file resides on. Using this function, I've created my own whereis utility. For example, if you typed whereis /usr/spool, you'd see output similar to:
x09/usr/spool is on //18/dev/hd0t77
and if you typed whereis 'which windows' you'd see output similar to:
x09/usr/bin/windows is on //107/dev/hd0t77
x09If you use this command in conjunction with mountlist, you can find out where everything is. For example, if you typed mountlist -n107, you'd see:
x09/dev/hd0t77 mounted as //107/
Here's the source for whereis:
//whereis.c
#include <stdio.h>
#include <limits.h>
#include <sys/fsys.h>
main( int argc, char *argv[] ){
x09char buffer[ _POSIX_NAME_MAX ];
x09x09if ( fsys_get_mount_dev ( argv[1], buffer ) == 0 )
x09x09printf ( "%s is on %sn", argv[1], buffer );
x09else
x09// couldn't resolve ( file/dir doesn't exit, or nonroot mountpoint )
x09printf ( "don't know... try mountlistn");
} |
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