On 28/10/2010, at 9:12 AM, john skaller wrote:
>
> I guess I use open() then dup2() to create fd's for 0,1,2 so
> the webserver can still do I/O.. not sure what happens
> to C++ streams cin, cout, cerr or C streams stdin, stdout. stderr
> though (I presume they will just keep working since underneath
> they have to use the unix fds ..?)
well, that's interesting. I do:
int sout = open("mystdout.log",O_CREAT | O_WRONLY | O_TRUNC);
int serr = open("mystderr.log",O_CREAT | O_WRONLY | O_TRUNC);
close(0); close(1); close(2);
dup2(sout,1);
dup2(serr,2);
while(1){
FILE *f= fopen("log.log","w");
fprintf(f,"Daemon running\n");
fclose(f);
printf("[stdout]Daemon running pid=%d\n",getpid());
fprintf(stderr,"[stderr]Daemon running pid=%d\n",getpid());
sleep(5);
}
and all the output goes into mystdout.log, mystderr.log is
empty. what did I do wrong here?
--
john skaller
[email protected]
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