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make sure we dont leak file descriptors to external scripts as pointed out by Roy Marples

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This commit is contained in:
Mike Frysinger 2006-04-08 01:10:01 +00:00
parent 2aa7fab29a
commit 1a9fb6c293
1 changed files with 7 additions and 1 deletions
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8
signalpipe.c
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@ -20,6 +20,7 @@
*/
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
@ -43,6 +44,8 @@ static void signal_handler(int sig)
void udhcp_sp_setup(void)
{
socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
fcntl(signal_pipe[0], F_SETFD, FD_CLOEXEC);
fcntl(signal_pipe[1], F_SETFD, FD_CLOEXEC);
signal(SIGUSR1, signal_handler);
signal(SIGUSR2, signal_handler);
signal(SIGTERM, signal_handler);
@ -56,7 +59,10 @@ int udhcp_sp_fd_set(fd_set *rfds, int extra_fd)
{
FD_ZERO(rfds);
FD_SET(signal_pipe[0], rfds);
if (extra_fd >= 0) FD_SET(extra_fd, rfds);
if (extra_fd >= 0) {
fcntl(extra_fd, F_SETFD, FD_CLOEXEC);
FD_SET(extra_fd, rfds);
}
return signal_pipe[0] > extra_fd ? signal_pipe[0] : extra_fd;
}