108 lines
1.8 KiB
C
108 lines
1.8 KiB
C
/* Microsyslogd that does basic syslogging.
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*/
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#include <stdio.h>
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#include <sys/select.h>
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <time.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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char *nodename;
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void logline(FILE *outfp, char *proc, char *line)
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{
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time_t now;
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struct tm *tm;
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char *d, *s;
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time(&now);
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tm = localtime(&now);
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d=asctime(tm);
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/* Trim off year and newline. */
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if((s=strrchr(d, ' ')))
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*s = '\0';
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if(s=strchr(d, ' ')) d = s+1;
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fprintf(outfp, "%s %s: %s\n", d, nodename, line);
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}
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void copy(int in_fd, FILE *outfp)
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{
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static char linebuf[5*1024];
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int l, acc = 0;
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while((l=read(in_fd, linebuf, sizeof(linebuf)-2)) > 0) {
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char *b, *eol;
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int i;
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acc += l;
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for(i = 0; i < l; i++)
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if(linebuf[i] == '\0')
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linebuf[i] = ' ';
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if(linebuf[l-1] == '\n') l--;
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linebuf[l] = '\n';
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linebuf[l+1] = '\0';
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b = linebuf;
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while(eol = strchr(b, '\n')) {
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*eol = '\0';
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logline(outfp, "kernel", b);
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b = eol+1;
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}
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}
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/* Nothing sensible happened? Avoid busy-looping. */
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if(!acc) sleep(1);
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return;
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}
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int
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main(int argc, char *argv[])
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{
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int config_fd, klog_fd, n, maxfd;
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char *nn;
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FILE *logfp;
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struct utsname utsname;
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if(uname(&utsname) < 0) {
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perror("uname");
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return 1;
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}
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nodename = utsname.nodename;
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if((nn=strchr(nodename, '.')))
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*nn = '\0';
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if((klog_fd = open("/dev/klog", O_NONBLOCK | O_RDONLY)) < 0) {
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perror("/dev/klog");
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return 1;
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}
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if(!(logfp = fopen("/var/log/messages", "a"))) {
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perror("/var/log/messages");
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return 1;
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}
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maxfd = klog_fd;
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while(1) {
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fd_set fds;
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FD_ZERO(&fds);
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FD_SET(klog_fd, &fds);
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n = select(maxfd+1, &fds, NULL, NULL, NULL);
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if(n <= 0) {
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sleep(1);
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continue;
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}
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if(FD_ISSET(klog_fd, &fds)) {
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copy(klog_fd, logfp);
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}
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fflush(logfp);
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sync();
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}
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return 0;
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}
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