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https://github.com/topjohnwu/ndk-busybox.git
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networking/interface.c: get rid of global data
These were data/bss: static.proc_read 1 - -1 int_list 4 - -4 int_last 4 - -4 We never call display_interfaces() twice, thus code to not scan /proc twice never triggers. function old new delta do_if_print - 1998 +1998 display_interfaces 145 249 +104 static.proc_read 1 - -1 add_interface 104 103 -1 int_list 4 - -4 int_last 4 - -4 if_readlist_proc 560 542 -18 if_readconf 141 - -141 do_if_fetch 643 - -643 ife_print 1296 - -1296 ------------------------------------------------------------------------------ (add/remove: 1/6 grow/shrink: 1/2 up/down: 2102/-2108) Total: -6 bytes text data bss dec hex filename 933084 473 6844 940401 e5971 busybox_old 933087 473 6836 940396 e596c busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
82ec89480d
commit
d51ba0b5ab
@ -341,8 +341,9 @@ struct interface {
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#endif
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};
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static struct interface *int_list, *int_last;
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struct iface_list {
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struct interface *int_list, *int_last;
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};
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#if 0
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@ -373,11 +374,11 @@ static int nstrcmp(const char *a, const char *b)
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}
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#endif
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static struct interface *add_interface(char *name)
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static struct interface *add_interface(struct iface_list *ilist, char *name)
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{
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struct interface *ife, **nextp, *new;
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for (ife = int_last; ife; ife = ife->prev) {
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for (ife = ilist->int_last; ife; ife = ife->prev) {
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int n = /*n*/strcmp(ife->name, name);
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if (n == 0)
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@ -388,13 +389,14 @@ static struct interface *add_interface(char *name)
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new = xzalloc(sizeof(*new));
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strncpy_IFNAMSIZ(new->name, name);
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nextp = ife ? &ife->next : &int_list;
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nextp = ife ? &ife->next : &ilist->int_list;
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new->prev = ife;
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new->next = *nextp;
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if (new->next)
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new->next->prev = new;
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else
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int_last = new;
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ilist->int_last = new;
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*nextp = new;
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return new;
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}
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@ -500,12 +502,12 @@ static int procnetdev_version(char *buf)
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return 0;
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}
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static int if_readconf(void)
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static void if_readconf(struct iface_list *ilist)
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{
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int numreqs = 30;
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struct ifconf ifc;
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struct ifreq *ifr;
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int n, err;
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int n;
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int skfd;
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ifc.ifc_buf = NULL;
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@ -518,10 +520,7 @@ static int if_readconf(void)
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ifc.ifc_len = sizeof(struct ifreq) * numreqs;
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ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);
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err = ioctl_or_warn(skfd, SIOCGIFCONF, &ifc);
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if (err < 0) {
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goto out;
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}
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xioctl(skfd, SIOCGIFCONF, &ifc);
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if (ifc.ifc_len == (int)(sizeof(struct ifreq) * numreqs)) {
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/* assume it overflowed and try again */
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numreqs += 10;
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@ -532,71 +531,54 @@ static int if_readconf(void)
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ifr = ifc.ifc_req;
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for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
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add_interface(ifr->ifr_name);
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add_interface(ilist, ifr->ifr_name);
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ifr++;
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}
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err = 0;
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out:
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close(skfd);
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free(ifc.ifc_buf);
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return err;
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}
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static int if_readlist_proc(char *target)
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static int if_readlist_proc(struct iface_list *ilist, char *ifname)
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{
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static smallint proc_read;
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FILE *fh;
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char buf[512];
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struct interface *ife;
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int err, procnetdev_vsn;
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if (proc_read)
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return 0;
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if (!target)
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proc_read = 1;
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int procnetdev_vsn;
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int ret;
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fh = fopen_or_warn(_PATH_PROCNET_DEV, "r");
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if (!fh) {
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return if_readconf();
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return 0; /* "not found" */
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}
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fgets(buf, sizeof buf, fh); /* eat line */
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fgets(buf, sizeof buf, fh);
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procnetdev_vsn = procnetdev_version(buf);
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err = 0;
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ret = 0;
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while (fgets(buf, sizeof buf, fh)) {
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char *s, name[IFNAMSIZ];
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s = get_name(name, buf);
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ife = add_interface(name);
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ife = add_interface(ilist, name);
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get_dev_fields(s, ife, procnetdev_vsn);
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ife->statistics_valid = 1;
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if (target && strcmp(target, name) == 0)
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if (ifname && strcmp(ifname, name) == 0) {
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ret = 1; /* found */
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break;
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}
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}
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#if 0 /* we trust kernel to not be buggy, /proc/net/dev reads never fail */
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if (ferror(fh)) {
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bb_perror_msg(_PATH_PROCNET_DEV);
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err = -1;
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proc_read = 0;
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}
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#endif
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fclose(fh);
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return err;
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return ret;
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}
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static int if_readlist(void)
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static void if_readlist(struct iface_list *ilist, char *ifname)
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{
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int err = if_readlist_proc(NULL);
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int found = if_readlist_proc(ilist, ifname);
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/* Needed in order to get ethN:M aliases */
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if (!err)
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err = if_readconf();
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return err;
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if (!found)
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if_readconf(ilist);
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}
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/* Fetch the interface configuration from the kernel. */
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@ -1096,50 +1078,21 @@ static int do_if_print(struct interface *ife, int show_downed_too)
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return res;
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}
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static struct interface *lookup_interface(char *name)
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{
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struct interface *ife = NULL;
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if (if_readlist_proc(name) < 0)
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return NULL;
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ife = add_interface(name);
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return ife;
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}
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#ifdef UNUSED
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static int for_all_interfaces(int (*doit) (struct interface *, void *),
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void *cookie)
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{
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struct interface *ife;
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if (!int_list) {
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int err = if_readlist();
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if (err < 0)
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return err;
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}
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for (ife = int_list; ife; ife = ife->next) {
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int err = doit(ife, cookie);
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if (err)
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return err;
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}
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return 0;
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}
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#endif
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int FAST_FUNC display_interfaces(char *ifname)
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{
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struct interface *ife;
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int res;
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struct iface_list ilist;
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ilist.int_list = NULL;
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ilist.int_last = NULL;
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if_readlist(&ilist, ifname != IFNAME_SHOW_DOWNED_TOO ? ifname : NULL);
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if (!ifname || ifname == IFNAME_SHOW_DOWNED_TOO) {
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/*res = for_all_interfaces(do_if_print, &interface_opt_a);*/
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if (!int_list) {
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res = if_readlist();
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if (res < 0)
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goto ret;
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}
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for (ife = int_list; ife; ife = ife->next) {
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for (ife = ilist.int_list; ife; ife = ife->next) {
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BUILD_BUG_ON((int)(intptr_t)IFNAME_SHOW_DOWNED_TOO != 1);
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res = do_if_print(ife, (int)(intptr_t)ifname);
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if (res < 0)
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goto ret;
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@ -1147,10 +1100,8 @@ int FAST_FUNC display_interfaces(char *ifname)
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return 0;
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}
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ife = lookup_interface(ifname);
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res = do_if_fetch(ife);
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if (res >= 0)
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ife_print(ife);
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ife = add_interface(&ilist, ifname);
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res = do_if_print(ife, /*show_downed_too:*/ 1);
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ret:
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return (res < 0); /* status < 0 == 1 -- error */
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}
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