Hi,
did you have trouble with rrdtool update not updating the timestamp
of the rrd file?
please test this little bit of c-code
does it compain on your platform.
cheers
tobi
--
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch [EMAIL PROTECTED] ++41 62 775 9902 / sb: -9900
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <utime.h>
int main (int argc,char *argv[]){
int fd;
struct stat stbuf;
char *addr;
int res;
char temp[] = "mmaptestXXXXXX";
struct utimbuf newtime;
time_t create_ts;
fd = mkstemp(temp);
if (fd == -1){
perror(temp);
return 1;
}
write(fd,"12345\n", 6);
stat(temp, &stbuf);
create_ts = stbuf.st_mtime;
newtime.actime = 0;
newtime.modtime = 0;
utime(temp,&newtime);
addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED) {
perror("mmap");
return 1;
}
addr[0]='x';
res = msync(addr, 4, MS_ASYNC);
if (res == -1) {
perror("msync");
return 1;
}
res = close(fd);
if (res == -1) {
perror("close");
return 1;
}
stat(temp, &stbuf);
if (create_ts > stbuf.st_mtime){
printf("msync(x,y,MS_ASYNC) does NOT update mtime\n");
return 2;
}
printf("msync(x,y,MS_ASYNC) does update mtime\n");
return 0;
}
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