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Diffstat (limited to 'support/include/ha-callout.h')
| -rw-r--r-- | support/include/ha-callout.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/support/include/ha-callout.h b/support/include/ha-callout.h new file mode 100644 index 0000000..a454bdb --- /dev/null +++ b/support/include/ha-callout.h @@ -0,0 +1,59 @@ +/* + * 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 |