93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
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/* Copyright (C) 1996 N.M. Maclaren
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Copyright (C) 1996 The University of Cambridge
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This includes code that really should have been part of ANSI/ISO C, but was
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left out for historical reasons (despite requests to define ftty), plus
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the get_lock() and log_message() functions.
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*/
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#include "header.h"
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#include <sys/types.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <signal.h>
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#define UNIX
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#include "kludges.h"
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#undef UNIX
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void do_nothing (int seconds) {
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/* Wait for a fixed period, possibly uninterruptibly. This should not wait
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for less than the specified period, if that can be avoided. */
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sleep((unsigned int)(seconds+2)); /* +2 is enough for POSIX */
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}
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int ftty (FILE *file) {
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/* Return whether the file is attached to an interactive device. */
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return isatty(fileno(file));
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}
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void set_lock (int lock) {
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/* Check that we have enough privileges to reset the time and that no other
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updating msntp process is running, but don't bother with fancy interlocking.
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This function is really only to permit the daemon mode to be restarted in a
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cron job and improve the diagnostics; it can be replaced by a 'return'
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statement if it causes implementation difficulties. Note that there is little
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point in clearing the lock under Unix, but do so anyway. */
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FILE *file;
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long pid;
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if (lockname == NULL || lockname[0] == '\0') return;
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if (lock) {
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errno = 0;
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if ((file = fopen(lockname,"r")) != NULL &&
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fscanf(file,"%ld",&pid) == 1 && kill(pid,0) == 0) {
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if (verbose || isatty(STDIN_FILENO) || isatty(STDOUT_FILENO))
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fatal(0,"another msntp process is currently running",NULL);
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else
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fatal(0,NULL,NULL);
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}
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if (file != NULL) fclose(file);
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errno = 0;
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if ((file = fopen(lockname,"w")) == NULL ||
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fprintf(file,"%ld\n",(long)getpid()) <= 0 ||
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ferror(file) || fclose(file) != 0)
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fatal(1,"unable to write PID to %s",lockname);
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adjust_time(0.0,1,0.0);
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} else {
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errno = 0;
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if (remove(lockname) != 0)
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fatal(1,"unable to remove the msntp lockname %s",lockname);
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}
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}
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/*
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* Log a message, crudely.
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* This is used in only one place, but could be used more widely.
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*/
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void
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log_message (const char *message)
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{
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syslog(
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#ifdef LOG_DAEMON
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LOG_DAEMON |
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#endif
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LOG_WARNING, "%s", message);
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}
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