httpd/support/rotatelogs.c

	rotatelogs.c revision 2e4b64595d221bd83ff057541e970c4cc737412d
/*
 * Simple program to rotate Apache logs without having to kill the server.
 *
 * Contributed by Ben Laurie <ben@algroup.co.uk>
 *
 * 12 Mar 1996
 */


#define BUFSIZE     65536
#ifdef MAX_PATH
#undef MAX_PATH
#endif
#define MAX_PATH    1024

#include "ap_config.h"
#include <time.h>
#include <errno.h>
#include <fcntl.h>

void main (int argc, char **argv)
{
    char buf[BUFSIZE], buf2[MAX_PATH];
    time_t tLogEnd = 0;
    time_t tRotation;
    int nLogFD = -1;
    int nRead;
    char *szLogRoot;

    if (argc != 3) {
    fprintf(stderr,
        "%s <logfile> <rotation time in seconds>\n\n",
        argv[0]);
#ifdef OS2
    fprintf(stderr,
        "Add this:\n\nTransferLog \"|%s.exe /some/where 86400\"\n\n",
        argv[0]);
#else
    fprintf(stderr,
        "Add this:\n\nTransferLog \"|%s /some/where 86400\"\n\n",
        argv[0]);
#endif
    fprintf(stderr,
        "to httpd.conf. The generated name will be /some/where.nnnn "
        "where nnnn is the\nsystem time at which the log nominally "
        "starts (N.B. this time will always be a\nmultiple of the "
        "rotation time, so you can synchronize cron scripts with it).\n"
        "At the end of each rotation time a new log is started.\n");
    exit(1);
    }

    szLogRoot = argv[1];
    tRotation = atoi(argv[2]);
    if (tRotation <= 0) {
    fprintf(stderr, "Rotation time must be > 0\n");
    exit(6);
    }

    for (;;) {
    nRead = read(0, buf, sizeof buf);
    if (nRead == 0)
        exit(3);
    if (nRead < 0)
        if (errno != EINTR)
        exit(4);
    if (nLogFD >= 0 && (time(NULL) >= tLogEnd || nRead < 0)) {
        close(nLogFD);
        nLogFD = -1;
    }
    if (nLogFD < 0) {
        time_t tLogStart = (time(NULL) / tRotation) * tRotation;
        sprintf(buf2, "%s.%010d", szLogRoot, (int) tLogStart);
        tLogEnd = tLogStart + tRotation;
        nLogFD = open(buf2, O_WRONLY | O_CREAT | O_APPEND, 0666);
        if (nLogFD < 0) {
        perror(buf2);
        exit(2);
        }
    }
    if (write(nLogFD, buf, nRead) != nRead) {
        perror(buf2);
        exit(5);
    }
    }
}