Hi,
I have a program that needs to find another particular process if it
is running. It used to do this by grovelling though /proc/pid/status,
looking for the particular program name. Essentially, I would do the
following:
stat ( "/proc", &sb );
fd = open ( "/proc", O_RDONLY );
while (!done) {
n = getdirentries ( fd, buf, sb.st_blksize, &basep );
/* check each /proc/pid/status file */
}
It seems as though stat() used to return a non-zero value for
st_blksize for /proc, but these days it does not (it's hard for me to
tell exactly when this happened, perhaps somewhere around revision
1.73 of src/sys/kern/vfs_vnops.c, but I'm not positive).
The man page for getdirentries() says:
int
getdirentries(int fd, char *buf, int nbytes, long *basep)
"The nbytes argument must be greater than or equal to the block
size associated with the file, see stat(2). Some filesys-
tems may not support these functions with buffers smaller than
this size."
So ... what are we supposed to use for this? For special filesystems
like /proc, is any old value that is sufficiently large enough to hold
a few struct dirent's considered to be OK? Should I not use
'getdirentries()', and opt instead for 'opendir()' and 'readdir()'?
Any advice is appreciated.
Thanks,
-Brian
--
Brian Dean
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