1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) tons of folks. Tracking down who wrote what
6 * isn't something I'm going to worry about... If you wrote something
7 * here, please feel free to acknowledge your work.
9 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
10 * Permission has been granted to redistribute this code under GPL.
12 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
15 /* We are trying to not use printf, this benefits the case when selected
16 * applets are really simple. Example:
20 * Currently defined functions:
21 * basename, false, true
24 * text data bss dec hex filename
25 * 4473 52 72 4597 11f5 busybox
27 * FEATURE_INSTALLER or FEATURE_SUID will still link printf routines in. :(
31 #if !(defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
32 || defined(__APPLE__) \
34 # include <malloc.h> /* for mallopt */
38 /* Declare <applet>_main() */
43 /* Include generated applet names, pointers to <applet>_main, etc */
44 #include "applet_tables.h"
45 /* ...and if applet_tables generator says we have only one applet... */
46 #ifdef SINGLE_APPLET_MAIN
47 # undef ENABLE_FEATURE_INDIVIDUAL
48 # define ENABLE_FEATURE_INDIVIDUAL 1
49 # undef IF_FEATURE_INDIVIDUAL
50 # define IF_FEATURE_INDIVIDUAL(...) __VA_ARGS__
53 #include "usage_compressed.h"
56 /* "Do not compress usage text if uncompressed text is small
57 * and we don't include bunzip2 code for other reasons"
59 * Useful for mass one-applet rebuild (bunzip2 code is ~2.7k).
61 * Unlike BUNZIP2, if FEATURE_SEAMLESS_BZ2 is on, bunzip2 code is built but
62 * still may be unused if none of the selected applets calls open_zipped()
63 * or its friends; we test for (FEATURE_SEAMLESS_BZ2 && <APPLET>) instead.
64 * For example, only if TAR and FEATURE_SEAMLESS_BZ2 are both selected,
65 * then bunzip2 code will be linked in anyway, and disabling help compression
66 * would be not optimal:
68 #if UNPACKED_USAGE_LENGTH < 4*1024 \
69 && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_TAR) \
70 && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MODPROBE) \
71 && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_INSMOD) \
72 && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_DEPMOD) \
73 && !(ENABLE_FEATURE_SEAMLESS_BZ2 && ENABLE_MAN) \
76 # undef ENABLE_FEATURE_COMPRESS_USAGE
77 # define ENABLE_FEATURE_COMPRESS_USAGE 0
81 #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
82 static const char usage_messages[] ALIGN1 = UNPACKED_USAGE;
84 # define usage_messages 0
87 #if ENABLE_FEATURE_COMPRESS_USAGE
89 static const char packed_usage[] ALIGN1 = { PACKED_USAGE };
90 # include "bb_archive.h"
91 static const char *unpack_usage_messages(void)
99 /* inbuf: */ packed_usage,
100 /* len: */ sizeof(packed_usage));
101 /* read_bunzip can longjmp to start_bunzip, and ultimately
102 * end up here with i != 0 on read data errors! Not trivial */
104 /* Cannot use xmalloc: will leak bd in NOFORK case! */
105 outbuf = malloc_or_warn(sizeof(UNPACKED_USAGE));
107 read_bunzip(bd, outbuf, sizeof(UNPACKED_USAGE));
112 # define dealloc_usage_messages(s) free(s)
116 # define unpack_usage_messages() usage_messages
117 # define dealloc_usage_messages(s) ((void)(s))
119 #endif /* FEATURE_COMPRESS_USAGE */
122 void FAST_FUNC bb_show_usage(void)
124 if (ENABLE_SHOW_USAGE) {
125 #ifdef SINGLE_APPLET_STR
126 /* Imagine that this applet is "true". Dont suck in printf! */
127 const char *usage_string = unpack_usage_messages();
129 if (*usage_string == '\b') {
130 full_write2_str("No help available.\n\n");
132 full_write2_str("Usage: "SINGLE_APPLET_STR" ");
133 full_write2_str(usage_string);
134 full_write2_str("\n\n");
136 if (ENABLE_FEATURE_CLEAN_UP)
137 dealloc_usage_messages((char*)usage_string);
140 const char *usage_string = p = unpack_usage_messages();
141 int ap = find_applet_by_name(applet_name);
143 if (ap < 0) /* never happens, paranoia */
146 while (*p++) continue;
149 full_write2_str(bb_banner);
150 full_write2_str(" multi-call binary.\n");
152 full_write2_str("\nNo help available.\n\n");
154 full_write2_str("\nUsage: ");
155 full_write2_str(applet_name);
156 full_write2_str(" ");
158 full_write2_str("\n");
160 if (ENABLE_FEATURE_CLEAN_UP)
161 dealloc_usage_messages((char*)usage_string);
167 int FAST_FUNC find_applet_by_name(const char *name)
173 /* The commented-out word-at-a-time code is ~40% faster, but +160 bytes.
174 * "Faster" here saves ~0.5 microsecond of real time - not worth it.
176 #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/
179 /* Handle all names < 2 chars long early */
181 return -1; /* "" is not a valid applet name */
182 if (name[1] == '\0') {
184 return -1; /* 1-char name is not valid */
186 return -1; /* 1-char name which isn't "[" is not valid */
187 /* applet "[" is always applet #0: */
194 #if KNOWN_APPNAME_OFFSETS <= 0
197 max = NUM_APPLETS * KNOWN_APPNAME_OFFSETS;
198 for (j = ARRAY_SIZE(applet_nameofs)-1; j >= 0; j--) {
199 const char *pp = applet_names + applet_nameofs[j];
200 if (strcmp(name, pp) >= 0) {
201 //bb_error_msg("name:'%s' >= pp:'%s'", name, pp);
203 i = max - NUM_APPLETS;
208 max /= (unsigned)KNOWN_APPNAME_OFFSETS;
209 i /= (unsigned)KNOWN_APPNAME_OFFSETS;
210 //bb_error_msg("name:'%s' starting from:'%s' i:%u max:%u", name, p, i, max);
213 /* Open-coded linear search without strcmp/strlen calls for speed */
215 #if 0 /*BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN*/
216 /* skip "[\0" name, it's surely not it */
217 if (ENABLE_TEST && LONE_CHAR(p, '['))
219 /* All remaining applet names in p[] are at least 2 chars long */
220 /* name[] is also at least 2 chars long */
222 n32 = (name[0] << 0) | (name[1] << 8) | (name[2] << 16);
227 /* Quickly check match of the first 3 bytes */
228 move_from_unaligned32(p32, p);
230 if ((p32 & 0x00ffffff) != n32) {
231 /* Most likely case: 3 first bytes do not match */
233 if ((p32 & 0x00ff0000) == '\0')
234 continue; // p[2] was NUL
236 if ((p32 & 0xff000000) == '\0')
237 continue; // p[3] was NUL
238 /* p[0..3] aren't matching and none is NUL, check the rest */
244 /* Unlikely branch: first 3 bytes ([0..2]) match */
245 if ((p32 & 0x00ff0000) == '\0') {
246 /* name is 2-byte long, it is full match */
247 //bb_error_msg("found:'%s' i:%u", name, i);
250 /* Check remaining bytes [3..NUL] */
253 while (ch == name[j]) {
255 //bb_error_msg("found:'%s' i:%u", name, i);
261 /* Not a match. Skip it, including NUL */
272 /* Do we see "name\0" in applet_names[p] position? */
273 while ((ch = *p) == name[j]) {
275 //bb_error_msg("found:'%s' i:%u", name, i);
282 * p => 1st non-matching char in applet_names[],
283 * skip to and including NUL.
295 void lbb_prepare(const char *applet
296 IF_FEATURE_INDIVIDUAL(, char **argv))
297 MAIN_EXTERNALLY_VISIBLE;
298 void lbb_prepare(const char *applet
299 IF_FEATURE_INDIVIDUAL(, char **argv))
302 (*(int **)&bb_errno) = __errno_location();
305 applet_name = applet;
307 if (ENABLE_LOCALE_SUPPORT)
308 setlocale(LC_ALL, "");
310 #if ENABLE_FEATURE_INDIVIDUAL
311 /* Redundant for busybox (run_applet_and_exit covers that case)
312 * but needed for "individual applet" mode */
315 && strcmp(argv[1], "--help") == 0
316 && !is_prefixed_with(applet, "busybox")
318 /* Special case. POSIX says "test --help"
319 * should be no different from e.g. "test --foo". */
320 if (!ENABLE_TEST || strcmp(applet_name, "test") != 0)
326 /* The code below can well be in applets/applets.c, as it is used only
327 * for busybox binary, not "individual" binaries.
328 * However, keeping it here and linking it into libbusybox.so
329 * (together with remaining tiny applets/applets.o)
330 * makes it possible to avoid --whole-archive at link time.
331 * This makes (shared busybox) + libbusybox smaller.
332 * (--gc-sections would be even better....)
335 const char *applet_name;
341 /* If not built as a single-applet executable... */
342 #if !defined(SINGLE_APPLET_MAIN)
344 IF_FEATURE_SUID(static uid_t ruid;) /* real uid */
346 # if ENABLE_FEATURE_SUID_CONFIG
348 static struct suid_config_t {
349 /* next ptr must be first: this struct needs to be llist-compatible */
350 struct suid_config_t *m_next;
351 struct bb_uidgid_t m_ugid;
356 static bool suid_cfg_readable;
358 /* libbb candidate */
359 static char *get_trimmed_slice(char *s, char *e)
361 /* First, consider the value at e to be nul and back up until we
362 * reach a non-space char. Set the char after that (possibly at
363 * the original e) to nul. */
371 /* Next, advance past all leading space and return a ptr to the
372 * first non-space char; possibly the terminating nul. */
373 return skip_whitespace(s);
376 static void parse_config_file(void)
378 /* Don't depend on the tools to combine strings. */
379 static const char config_file[] ALIGN1 = "/etc/busybox.conf";
381 struct suid_config_t *sct_head;
390 if (ruid == 0) /* run by root - don't need to even read config file */
393 if ((stat(config_file, &st) != 0) /* No config file? */
394 || !S_ISREG(st.st_mode) /* Not a regular file? */
395 || (st.st_uid != 0) /* Not owned by root? */
396 || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
397 || !(f = fopen_for_read(config_file)) /* Cannot open? */
402 suid_cfg_readable = 1;
410 if (!fgets(buffer, sizeof(buffer), f)) { /* Are we done? */
412 //if (ferror(f)) { /* Make sure it wasn't a read error. */
413 // errmsg = "reading";
417 suid_config = sct_head; /* Success, so set the pointer. */
422 lc++; /* Got a (partial) line. */
424 /* If a line is too long for our buffer, we consider it an error.
425 * The following test does mistreat one corner case though.
426 * If the final line of the file does not end with a newline and
427 * yet exactly fills the buffer, it will be treated as too long
428 * even though there isn't really a problem. But it isn't really
429 * worth adding code to deal with such an unlikely situation, and
430 * we do err on the side of caution. Besides, the line would be
431 * too long if it did end with a newline. */
432 if (!strchr(s, '\n') && !feof(f)) {
433 errmsg = "line too long";
437 /* Trim leading and trailing whitespace, ignoring comments, and
438 * check if the resulting string is empty. */
439 s = get_trimmed_slice(s, strchrnul(s, '#'));
444 /* Check for a section header. */
447 /* Unlike the old code, we ignore leading and trailing
448 * whitespace for the section name. We also require that
449 * there are no stray characters after the closing bracket. */
450 char *e = strchr(s, ']');
451 if (!e /* Missing right bracket? */
452 || e[1] /* Trailing characters? */
453 || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
455 errmsg = "section header";
458 /* Right now we only have one section so just check it.
459 * If more sections are added in the future, please don't
460 * resort to cascading ifs with multiple strcasecmp calls.
461 * That kind of bloated code is all too common. A loop
462 * and a string table would be a better choice unless the
463 * number of sections is very small. */
464 if (strcasecmp(s, "SUID") == 0) {
468 section = -1; /* Unknown section so set to skip. */
472 /* Process sections. */
474 if (section == 1) { /* SUID */
475 /* Since we trimmed leading and trailing space above, we're
476 * now looking for strings of the form
477 * <key>[::space::]*=[::space::]*<value>
478 * where both key and value could contain inner whitespace. */
480 /* First get the key (an applet name in our case). */
481 char *e = strchr(s, '=');
483 s = get_trimmed_slice(s, e);
485 if (!e || !*s) { /* Missing '=' or empty key. */
490 /* Ok, we have an applet name. Process the rhs if this
491 * applet is currently built in and ignore it otherwise.
492 * Note: this can hide config file bugs which only pop
493 * up when the busybox configuration is changed. */
494 applet_no = find_applet_by_name(s);
495 if (applet_no >= 0) {
497 struct suid_config_t *sct;
499 /* Note: We currently don't check for duplicates!
500 * The last config line for each applet will be the
501 * one used since we insert at the head of the list.
502 * I suppose this could be considered a feature. */
503 sct = xzalloc(sizeof(*sct));
504 sct->m_applet = applet_no;
506 sct->m_next = sct_head;
509 /* Get the specified mode. */
511 e = skip_whitespace(e+1);
513 for (i = 0; i < 3; i++) {
514 /* There are 4 chars for each of user/group/other.
515 * "x-xx" instead of "x-" are to make
516 * "idx > 3" check catch invalid chars.
518 static const char mode_chars[] ALIGN1 = "Ssx-" "Ssx-" "x-xx";
519 static const unsigned short mode_mask[] ALIGN2 = {
520 S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* Ssx- */
521 S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* Ssx- */
524 const char *q = strchrnul(mode_chars + 4*i, *e);
525 unsigned idx = q - (mode_chars + 4*i);
530 sct->m_mode |= mode_mask[q - mode_chars];
534 /* Now get the user/group info. */
536 s = skip_whitespace(e);
537 /* Default is 0.0, else parse USER.GROUP: */
539 /* We require whitespace between mode and USER.GROUP */
540 if ((s == e) || !(e = strchr(s, '.'))) {
544 *e = ':'; /* get_uidgid needs USER:GROUP syntax */
545 if (get_uidgid(&sct->m_ugid, s) == 0) {
546 errmsg = "unknown user/group";
554 /* Unknown sections are ignored. */
556 /* Encountering configuration lines prior to seeing a
557 * section header is treated as an error. This is how
558 * the old code worked, but it may not be desirable.
559 * We may want to simply ignore such lines in case they
560 * are used in some future version of busybox. */
562 errmsg = "keyword outside section";
569 bb_error_msg("parse error in %s, line %u: %s", config_file, lc, errmsg);
571 /* Release any allocated memory before returning. */
572 llist_free((llist_t*)sct_head, NULL);
575 static inline void parse_config_file(void)
577 IF_FEATURE_SUID(ruid = getuid();)
579 # endif /* FEATURE_SUID_CONFIG */
582 # if ENABLE_FEATURE_SUID && NUM_APPLETS > 0
583 # if ENABLE_FEATURE_SUID_CONFIG
584 /* check if u is member of group g */
585 static int ingroup(uid_t u, gid_t g)
587 struct group *grp = getgrgid(g);
590 for (mem = grp->gr_mem; *mem; mem++) {
591 struct passwd *pwd = getpwnam(*mem);
592 if (pwd && (pwd->pw_uid == u))
600 static void check_suid(int applet_no)
602 gid_t rgid; /* real gid */
604 if (ruid == 0) /* set by parse_config_file() */
605 return; /* run by root - no need to check more */
608 # if ENABLE_FEATURE_SUID_CONFIG
609 if (suid_cfg_readable) {
611 struct suid_config_t *sct;
614 for (sct = suid_config; sct; sct = sct->m_next) {
615 if (sct->m_applet == applet_no)
618 goto check_need_suid;
620 /* Is this user allowed to run this applet? */
622 if (sct->m_ugid.uid == ruid)
625 else if ((sct->m_ugid.gid == rgid) || ingroup(ruid, sct->m_ugid.gid))
626 /* same group / in group */
628 if (!(m & S_IXOTH)) /* is x bit not set? */
629 bb_error_msg_and_die("you have no permission to run this applet");
631 /* We set effective AND saved ids. If saved-id is not set
632 * like we do below, seteuid(0) can still later succeed! */
634 /* Are we directed to change gid
635 * (APPLET = *s* USER.GROUP or APPLET = *S* USER.GROUP)?
637 if (sct->m_mode & S_ISGID)
638 rgid = sct->m_ugid.gid;
639 /* else: we will set egid = rgid, thus dropping sgid effect */
640 if (setresgid(-1, rgid, rgid))
641 bb_perror_msg_and_die("setresgid");
643 /* Are we directed to change uid
644 * (APPLET = s** USER.GROUP or APPLET = S** USER.GROUP)?
647 if (sct->m_mode & S_ISUID)
648 uid = sct->m_ugid.uid;
649 /* else: we will set euid = ruid, thus dropping suid effect */
650 if (setresuid(-1, uid, uid))
651 bb_perror_msg_and_die("setresuid");
655 # if !ENABLE_FEATURE_SUID_CONFIG_QUIET
657 static bool onetime = 0;
661 bb_error_msg("using fallback suid method");
667 if (APPLET_SUID(applet_no) == BB_SUID_REQUIRE) {
668 /* Real uid is not 0. If euid isn't 0 too, suid bit
669 * is most probably not set on our executable */
671 bb_error_msg_and_die("must be suid to work properly");
672 } else if (APPLET_SUID(applet_no) == BB_SUID_DROP) {
673 xsetgid(rgid); /* drop all privileges */
676 # if ENABLE_FEATURE_SUID_CONFIG
678 llist_free((llist_t*)suid_config, NULL);
682 # define check_suid(x) ((void)0)
683 # endif /* FEATURE_SUID */
686 # if ENABLE_FEATURE_INSTALLER
687 static const char usr_bin [] ALIGN1 = "/usr/bin/";
688 static const char usr_sbin[] ALIGN1 = "/usr/sbin/";
689 static const char *const install_dir[] = {
690 &usr_bin [8], /* "/" */
691 &usr_bin [4], /* "/bin/" */
692 &usr_sbin[4] /* "/sbin/" */
693 # if !ENABLE_INSTALL_NO_USR
699 /* create (sym)links for each applet */
700 static void install_links(const char *busybox, int use_symbolic_links,
701 char *custom_install_dir)
704 * this should be consistent w/ the enum,
705 * busybox.h::bb_install_loc_t, or else... */
706 int (*lf)(const char *, const char *);
708 const char *appname = applet_names;
713 if (use_symbolic_links)
716 for (i = 0; i < ARRAY_SIZE(applet_main); i++) {
717 fpc = concat_path_file(
718 custom_install_dir ? custom_install_dir : install_dir[APPLET_INSTALL_LOC(i)],
720 // debug: bb_error_msg("%slinking %s to busybox",
721 // use_symbolic_links ? "sym" : "", fpc);
722 rc = lf(busybox, fpc);
723 if (rc != 0 && errno != EEXIST) {
724 bb_simple_perror_msg(fpc);
727 while (*appname++ != '\0')
731 # elif ENABLE_BUSYBOX
732 static void install_links(const char *busybox UNUSED_PARAM,
733 int use_symbolic_links UNUSED_PARAM,
734 char *custom_install_dir UNUSED_PARAM)
740 static void run_applet_and_exit(const char *name, char **argv) NORETURN;
742 /* If we were called as "busybox..." */
743 static int busybox_main(char **argv)
746 /* Called without arguments */
749 unsigned output_width;
751 output_width = get_terminal_width(2);
754 full_write2_str(bb_banner); /* reuse const string */
755 full_write2_str(" multi-call binary.\n"); /* reuse */
757 "BusyBox is copyrighted by many authors between 1998-2015.\n"
758 "Licensed under GPLv2. See source distribution for detailed\n"
759 "copyright notices.\n"
761 "Usage: busybox [function [arguments]...]\n"
762 " or: busybox --list"IF_FEATURE_INSTALLER("[-full]")"\n"
763 IF_FEATURE_INSTALLER(
764 " or: busybox --install [-s] [DIR]\n"
766 " or: function [arguments]...\n"
768 IF_NOT_FEATURE_SH_STANDALONE(
769 "\tBusyBox is a multi-call binary that combines many common Unix\n"
770 "\tutilities into a single executable. Most people will create a\n"
771 "\tlink to busybox for each function they wish to use and BusyBox\n"
772 "\twill act like whatever it was invoked as.\n"
774 IF_FEATURE_SH_STANDALONE(
775 "\tBusyBox is a multi-call binary that combines many common Unix\n"
776 "\tutilities into a single executable. The shell in this build\n"
777 "\tis configured to run built-in utilities without $PATH search.\n"
778 "\tYou don't need to install a link to busybox for each utility.\n"
779 "\tTo run external program, use full path (/sbin/ip instead of ip).\n"
782 "Currently defined functions:\n"
786 /* prevent last comma to be in the very last pos */
789 int len2 = strlen(a) + 2;
790 if (col >= (int)output_width - len2) {
791 full_write2_str(",\n");
796 full_write2_str("\t");
798 full_write2_str(", ");
804 full_write2_str("\n");
808 if (is_prefixed_with(argv[1], "--list")) {
810 const char *a = applet_names;
813 # if ENABLE_FEATURE_INSTALLER
814 if (argv[1][6]) /* --list-full? */
815 full_write2_str(install_dir[APPLET_INSTALL_LOC(i)] + 1);
818 full_write2_str("\n");
826 if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
827 int use_symbolic_links;
830 busybox = xmalloc_readlink(bb_busybox_exec_path);
832 /* bb_busybox_exec_path is usually "/proc/self/exe".
833 * In chroot, readlink("/proc/self/exe") usually fails.
834 * In such case, better use argv[0] as symlink target
835 * if it is a full path name.
837 if (argv[0][0] != '/')
838 bb_error_msg_and_die("'%s' is not an absolute path", argv[0]);
841 /* busybox --install [-s] [DIR]:
843 * DIR: directory to install links to
845 use_symbolic_links = (argv[2] && strcmp(argv[2], "-s") == 0 && ++argv);
846 install_links(busybox, use_symbolic_links, argv[2]);
850 if (strcmp(argv[1], "--help") == 0) {
851 /* "busybox --help [<applet>]" */
854 /* convert to "<applet> --help" */
858 /* "busybox <applet> arg1 arg2 ..." */
861 /* We support "busybox /a/path/to/applet args..." too. Allows for
862 * "#!/bin/busybox"-style wrappers */
863 applet_name = bb_get_last_path_component_nostrip(argv[0]);
864 run_applet_and_exit(applet_name, argv);
869 void FAST_FUNC run_applet_no_and_exit(int applet_no, char **argv)
876 /* Reinit some shared global data */
877 xfunc_error_retval = EXIT_FAILURE;
878 applet_name = bb_get_last_path_component_nostrip(argv[0]);
880 /* Special case. POSIX says "test --help"
881 * should be no different from e.g. "test --foo".
882 * Thus for "test", we skip --help check.
883 * "true" and "false" are also special.
886 # if defined APPLET_NO_test
887 && applet_no != APPLET_NO_test
889 # if defined APPLET_NO_true
890 && applet_no != APPLET_NO_true
892 # if defined APPLET_NO_false
893 && applet_no != APPLET_NO_false
896 if (argc == 2 && strcmp(argv[1], "--help") == 0) {
897 /* Make "foo --help" exit with 0: */
898 xfunc_error_retval = 0;
902 if (ENABLE_FEATURE_SUID)
903 check_suid(applet_no);
904 xfunc_error_retval = applet_main[applet_no](argc, argv);
905 /* Note: applet_main() may also not return (die on a xfunc or such) */
908 # endif /* NUM_APPLETS > 0 */
910 # if ENABLE_BUSYBOX || NUM_APPLETS > 0
911 static NORETURN void run_applet_and_exit(const char *name, char **argv)
914 if (is_prefixed_with(name, "busybox"))
915 exit(busybox_main(argv));
918 /* find_applet_by_name() search is more expensive, so goes second */
920 int applet = find_applet_by_name(name);
922 run_applet_no_and_exit(applet, argv);
926 /*bb_error_msg_and_die("applet not found"); - links in printf */
927 full_write2_str(applet_name);
928 full_write2_str(": applet not found\n");
929 /* POSIX: "If a command is not found, the exit status shall be 127" */
934 #endif /* !defined(SINGLE_APPLET_MAIN) */
937 #if ENABLE_BUILD_LIBBUSYBOX
938 int lbb_main(char **argv)
940 int main(int argc UNUSED_PARAM, char **argv)
944 /* TODO: find a use for a block of memory between end of .bss
945 * and end of page. For example, I'm getting "_end:0x812e698 2408 bytes"
946 * - more than 2k of wasted memory (in this particular build)
947 * *per each running process*!
948 * (If your linker does not generate "_end" name, weak attribute
949 * makes &_end == NULL, end_len == 0 here.)
951 extern char _end[] __attribute__((weak));
952 unsigned end_len = (-(int)_end) & 0xfff;
953 printf("_end:%p %u bytes\n", &_end, end_len);
956 /* Tweak malloc for reduced memory consumption */
957 #ifdef M_TRIM_THRESHOLD
958 /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory
959 * to keep before releasing to the OS
960 * Default is way too big: 256k
962 mallopt(M_TRIM_THRESHOLD, 8 * 1024);
964 #ifdef M_MMAP_THRESHOLD
965 /* M_MMAP_THRESHOLD is the request size threshold for using mmap()
966 * Default is too big: 256k
968 mallopt(M_MMAP_THRESHOLD, 32 * 1024 - 256);
970 #if 0 /*def M_TOP_PAD*/
971 /* When the program break is increased, then M_TOP_PAD bytes are added
972 * to the sbrk(2) request. When the heap is trimmed because of free(3),
973 * this much free space is preserved at the top of the heap.
974 * glibc default seems to be way too big: 128k, but need to verify.
976 mallopt(M_TOP_PAD, 8 * 1024);
980 /* NOMMU re-exec trick sets high-order bit in first byte of name */
981 if (argv[0][0] & 0x80) {
987 #if defined(SINGLE_APPLET_MAIN)
989 /* Only one applet is selected in .config */
990 if (argv[1] && is_prefixed_with(argv[0], "busybox")) {
991 /* "busybox <applet> <params>" should still work as expected */
994 /* applet_names in this case is just "applet\0\0" */
995 lbb_prepare(applet_names IF_FEATURE_INDIVIDUAL(, argv));
996 return SINGLE_APPLET_MAIN(argc, argv);
998 #elif !ENABLE_BUSYBOX && NUM_APPLETS == 0
1000 full_write2_str(bb_basename(argv[0]));
1001 full_write2_str(": no applets enabled\n");
1006 lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
1007 # if !ENABLE_BUSYBOX
1008 if (argv[1] && is_prefixed_with(bb_basename(argv[0]), "busybox"))
1011 applet_name = argv[0];
1012 if (applet_name[0] == '-')
1014 applet_name = bb_basename(applet_name);
1015 parse_config_file(); /* ...maybe, if FEATURE_SUID_CONFIG */
1016 run_applet_and_exit(applet_name, argv);