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construct/tools/viconf.c

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/*
* viconf.c
*
* $Id: viconf.c 6 2005-09-10 01:02:21Z nenolod $
*/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <signal.h>
#include "config.h"
/* wait.h is in /include on solaris, likely on other SYSV machines as well
* but wait.h is normally in /include/sys on BSD boxen,
* probably we should have an #ifdef SYSV?
* -Dianora
*/
#ifdef SOL20
#include <wait.h>
#else
#include <sys/wait.h>
#endif
static int LockedFile(const char *filename);
static char lockpath[PATH_MAX + 1];
int main(int argc, char *argv[])
{
const char *ed, *p, *filename = CPATH;
if( chdir(DPATH) < 0 )
{
fprintf(stderr,"Cannot chdir to %s\n", DPATH);
exit(errno);
}
if((p = strrchr(argv[0], '/')) == NULL)
p = argv[0];
else
p++;
#ifdef KPATH
if(strcmp(p, "viklines") == 0)
filename = KPATH;
#endif /* KPATH */
if(strcmp(p, "vimotd") == 0)
filename = MPATH;
if(LockedFile(filename))
{
fprintf(stderr,"Can't lock %s\n", filename);
exit(errno);
}
/* ed config file */
switch(fork())
{
case -1:
fprintf(stderr, "error forking, %d\n", errno);
exit(errno);
case 0: /* Child */
if((ed = getenv("EDITOR")) == NULL)
ed = "vi";
execlp(ed, ed, filename, NULL);
fprintf(stderr, "error running editor, %d\n", errno);
exit(errno);
default:
wait(0);
}
unlink(lockpath);
return 0;
}
/*
* LockedFile() (copied from m_kline.c in ircd)
* Determine if 'filename' is currently locked. If it is locked,
* there should be a filename.lock file which contains the current
* pid of the editing process. Make sure the pid is valid before
* giving up.
*
* Return: 1 if locked
* -1 if couldn't unlock
* 0 if was able to lock
*/
static int
LockedFile(const char *filename)
{
char buffer[1024];
FILE *fileptr;
int killret;
int fd;
if (!filename)
return (0);
sprintf(lockpath, "%s.lock", filename);
if ((fileptr = fopen(lockpath, "r")) != NULL)
{
if (fgets(buffer, sizeof(buffer) - 1, fileptr))
{
/*
* If it is a valid lockfile, 'buffer' should now
* contain the pid number of the editing process.
* Send the pid a SIGCHLD to see if it is a valid
* pid - it could be a remnant left over from a
* crashed editor or system reboot etc.
*/
killret = kill(atoi(buffer), SIGCHLD);
if (killret == 0)
{
fclose(fileptr);
return (1);
}
/*
* killret must be -1, which indicates an error (most
* likely ESRCH - No such process), so it is ok to
* proceed writing klines.
*/
}
fclose(fileptr);
}
/*
* Delete the outdated lock file
*/
unlink(lockpath);
/* create exclusive lock */
if((fd = open(lockpath, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0)
{
fprintf(stderr, "ircd config file locked\n");
return (-1);
}
fileptr = fdopen(fd,"w");
fprintf(fileptr,"%d\n",(int)getpid());
fclose(fileptr);
return (0);
} /* LockedFile() */