I have the following code:
pid_t pid;
int sv[2];
int val;
char arg0[] = "someotherprog";
char arg1[] = VSTRING;
char* arg[] = {arg0, arg1, 0};
socketpair(AF_UNIX, SOCK_STREAM, 0, sv);
printf("socketpair returned %i,%i\n", sv[0], sv[1]);
cox(sv[0]);
cox(sv[1]);
val = fcntl(sv[0], F_GETFL, 0);
fcntl(sv[0], F_SETFL, val | O_NONBLOCK);
pid = vfork();
if (pid == 0) {
dup2(3, sv[1]);
ncox(3);
execve("/someotherprog", arg, 0);
}
close(sv[1]);
cox() sets FD_CLOEXEC while ncox() deletes.
1. Problem:
I need to clear FD_CLOEXEC on the descriptor that dup2 returned.
Otherwise the the programm has fd 3 invalid.
I wonder why dup2 did not clear it.
2. Problem:
If I write(2) to sv[0] in the parent process I get an SIGPIPE.
And read(2) on fd 3 in the child returns socket not connected.
--
B.Walter COSMO-Project http://www.cosmo-project.de
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