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lib/sockets.c
65 строк
2 KB
Mike Frysinger
lib: af: constify aftype
25 авг 2015, 07:20
25 авг 2015, 07:20
a6118de
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/* sockets.c. Rewriten by Andi Kleen. Subject to the GPL. */ /* philb 14/11/98: we now stash the socket file descriptor inside the `aftype' structure rather than keeping it in a pile of separate variables. This is necessary so that "ifconfig eth0 broadcast ..." issues ioctls to the right socket for the address family in use; picking one at random doesn't always work. */ #include <sys/socket.h> #include <stdio.h> #include <unistd.h> #include "config.h" #include "sockets.h" #include "intl.h" #include "util.h" #include "net-support.h" int skfd = -1; /* generic raw socket desc. */ int sockets_open(int family) { struct aftype * const *aft; int sfd = -1; static int force = -1; if (force < 0) { force = 0; if (kernel_version() < KRELEASE(2, 1, 0)) force = 1; if (access("/proc/net", R_OK)) force = 1; } for (aft = aftypes; *aft; aft++) { struct aftype *af = *aft; int type = SOCK_DGRAM; if (af->af == AF_UNSPEC) continue; if (family && family != af->af) continue; if (af->fd != -1) { sfd = af->fd; continue; } /* Check some /proc file first to not stress kmod */ if (!family && !force && af->flag_file) { if (access(af->flag_file, R_OK)) continue; } #if HAVE_AFNETROM if (af->af == AF_NETROM) type = SOCK_SEQPACKET; #endif #if HAVE_AFX25 if (af->af == AF_X25) type = SOCK_SEQPACKET; #endif af->fd = socket(af->af, type, 0); if (af->fd >= 0) sfd = af->fd; } if (sfd < 0) fprintf(stderr, _("No usable address families found.\n")); return sfd; }