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/*
* support/include/ha-callout.h
*
* High Availability NFS Callout support routines
*
* Copyright (c) 2004, Paul Clements, SteelEye Technology
*
* In order to implement HA NFS, we need several callouts at key
* points in statd and mountd. These callouts all come to ha_callout(),
* which, in turn, calls out to an ha-callout script (not part of nfs-utils;
* defined by -H argument to rpc.statd and rpc.mountd).
*/
#ifndef HA_CALLOUT_H
#define HA_CALLOUT_H
#include <sys/wait.h>
#include <signal.h>
extern char *ha_callout_prog;
static inline void
ha_callout(char *event, char *arg1, char *arg2, int arg3)
{
char buf[16]; /* should be plenty */
pid_t pid;
int ret = -1;
struct sigaction oldact, newact;
if (!ha_callout_prog) /* HA callout is not enabled */
return;
sprintf(buf, "%d", arg3);
/* many daemons ignore SIGCHLD as tcpwrappers will
* fork a child to do logging. We need to wait
* for a child here, so we need to un-ignore
* SIGCHLD temporarily
*/
newact.sa_handler = SIG_DFL;
newact.sa_flags = 0;
sigemptyset(&newact.sa_mask);
sigaction(SIGCHLD, &newact, &oldact);
pid = fork();
switch (pid) {
case 0: execl(ha_callout_prog, ha_callout_prog,
event, arg1, arg2,
arg3 < 0 ? NULL : buf,
NULL);
perror("execl");
_exit(2);
case -1: perror("fork");
break;
default: pid = waitpid(pid, &ret, 0);
}
sigaction(SIGCHLD, &oldact, &newact);
xlog(D_GENERAL, "ha callout returned %d\n", WEXITSTATUS(ret));
}
#endif
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