Kontron KTAM3874-pITX Bedienungsanleitung PDF herunterladen (Seite 275)

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101

KTD-S0057-I Page 271 Linux® Programming Examples (DebianTM)

KTAM3874/pITX Software Guide

After the input of

sudo rcconf

you see the following screen

The next item concerns the pidfile topic. The presence of a locked pidfile prevents two instances of a

daemon with the same name from running at the same time. The pidfile contains a single line of text, being

the numeric process ID of the process that currently holds the lock. The following suggestion for the server

application:

static int pidfile;

int create_pidfile (void)

{

char str [32];

if ((pidfile = open ("/var/run/serverd.pid", O_RDWR | O_CREAT)) < 0)

return -1;

/* Try to lock the file and test the presence of an existing pidfile */

if (lockf (pidfile, F_TLOCK, 0) < 0)

{

close (pidfile);

return -1;

}

sprintf (str, "%d\n", getpid ());

if (write (pidfile, str, strlen (str)) < 0)

{

close (pidfile);

return -1;

}

return 0;

}

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