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netdev-linux: Don't close(0) when closing an ordinary netdev.

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Calling close(0) at random points is bad.  It means that the next call to
socket() or open() returns fd 0.  Then the next time a netdev gets closed,
that socket or file fd gets closed too, and you end up with weird "Bad
file descriptor" errors.

Found by installing the following as lib/unistd.h in the source tree:

#ifndef UNISTD_H
#define UNISTD_H 1

#include <stdlib.h>
#include_next <unistd.h>

#undef close
#define close(fd) rpl_close(fd)

static inline int rpl_close(int fd)
{
    if (!fd) {
        abort();
    }
    return (close)(fd);
}

#endif
This commit is contained in:
Ben Pfaff
2010-01-15 14:06:15 -08:00
parent f3ac83df5c
commit 88258e0034
1 changed files with 2 additions and 1 deletions
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3
lib/netdev-linux.c
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@@ -821,7 +821,6 @@ netdev_linux_open(struct netdev_dev *netdev_dev_, int ethertype,
if (!strcmp(netdev_dev_get_type(netdev_dev_), "tap")) {
netdev->fd = netdev_dev->state.tap.fd;
} else if (ethertype != NETDEV_ETH_TYPE_NONE) {
struct sockaddr_ll sll;
int protocol;
@@ -869,6 +868,8 @@ netdev_linux_open(struct netdev_dev *netdev_dev_, int ethertype,
if (error) {
goto error;
}
} else {
netdev->fd = -1;
}
*netdevp = &netdev->netdev;