Mail Archives: cygwin/2005/11/13/11:09:17
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Hi,
when starting a daemon from the console, the console will not close
before the daemon finishes.
Try, e.g:
$ /usr/sbin/syslogd
$ exit
Shell exits, but console window persists until syslogd is terminated.
Workaround:
setsid();
+ #ifdef __CYGWIN__
+ FreeConsole();
+ #endif
The attached program demonstrates the issue.
If run without an argument, the output line is written to current console.
It should be written to a new console, but AllocConsole() does nothing
because the current console is still attached.
If run with any argument, FreeConsole is called after setsid().
It should return FALSE, but returns TRUE (status=1).
Then the output line is written to a new console.
According to syscall.cc:setsid(), FreeConsole() should be called if a
tty exists and no files are open.
Diagnostic via strace doesn't help. The program works as expected if run
via strace ... interesting?-)
Thanks for any help
Christian
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#include <stdio.h>
#include <unistd.h>
#include <windows.h>
main(int argc, char **argv)
{
if (fork())
return 0;
fclose(stdin); fclose(stdout); fclose(stderr);
setsid();
int status = -1;
if (argc > 1)
status = FreeConsole();
sleep(10);
AllocConsole();
freopen("/dev/conout", "w", stdout);
printf("Welcome back, status=%d\n", status);
sleep(20);
return 0;
}
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