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