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use libbb/get_kernel_revision(), reduce stack usage, add loses -w -f option for getopt, convert to bb_getopt_ulflags(), reduce memory usage - xmalloc to bb_common_bufsiz1, size reduce over 200 bytes

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This commit is contained in:
"Vladimir N. Oleynik" 2005-11-28 15:54:22 +00:00
parent 52219874fe
commit 8c44f0179d
1 changed files with 48 additions and 60 deletions
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108
modutils/rmmod.c
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@ -32,28 +32,20 @@
#include "busybox.h"
#ifdef CONFIG_FEATURE_2_6_MODULES
static inline void filename2modname(char *modname, const char *filename)
static inline void filename2modname(char *modname, const char *afterslash)
{
const char *afterslash;
unsigned int i;
afterslash = strrchr(filename, '/');
if (!afterslash)
afterslash = filename;
else
afterslash++;
#if ENABLE_FEATURE_2_4_MODULES
int kr_chk = 1;
if (get_kernel_revision() <= 2*65536+6*256)
kr_chk = 0;
#else
#define kr_chk 1
#endif
/* Convert to underscores, stop at first . */
for (i = 0; afterslash[i] && afterslash[i] != '.'; i++) {
int kr_chk = 1;
if (ENABLE_FEATURE_2_4_MODULES) {
struct utsname uname_info;
if (uname(&uname_info) == -1)
bb_error_msg_and_die("cannot get uname data");
if (strcmp(uname_info.release, "2.6") < 0)
kr_chk = 0;
}
if (kr_chk && (afterslash[i] == '-'))
modname[i] = '_';
else
@ -66,67 +58,63 @@ static inline void filename2modname(char *modname, const char *filename)
extern int rmmod_main(int argc, char **argv)
{
int n, ret = EXIT_SUCCESS;
size_t nmod = 0; /* number of modules */
size_t pnmod = -1; /* previous number of modules */
unsigned int flags = O_NONBLOCK|O_EXCL;
#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
void *buf; /* hold the module names which we ignore but must get */
size_t bufsize = 0;
/* bb_common_bufsiz1 hold the module names which we ignore
but must get */
size_t bufsize = sizeof(bb_common_bufsiz1);
#endif
/* Parse command line. */
while ((n = getopt(argc, argv, "a")) != EOF) {
switch (n) {
case 'w': // --wait
flags &= ~O_NONBLOCK;
break;
case 'f': // --force
flags |= O_TRUNC;
break;
case 'a':
/* Unload _all_ unused modules via NULL delete_module() call */
/* until the number of modules does not change */
n = bb_getopt_ulflags(argc, argv, "wfa");
if((n & 1)) // --wait
flags &= ~O_NONBLOCK;
if((n & 2)) // --force
flags |= O_TRUNC;
if((n & 4)) {
/* Unload _all_ unused modules via NULL delete_module() call */
/* until the number of modules does not change */
size_t nmod = 0; /* number of modules */
size_t pnmod = -1; /* previous number of modules */
while (nmod != pnmod) {
if (syscall(__NR_delete_module, NULL, flags) < 0) {
if (errno==EFAULT)
return(ret);
bb_perror_msg_and_die("rmmod");
}
pnmod = nmod;
#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
buf = xmalloc(bufsize = 256);
/* 1 == QM_MODULES */
if (my_query_module(NULL, 1, &bb_common_bufsiz1, &bufsize, &nmod)) {
bb_perror_msg_and_die("QM_MODULES");
}
#endif
while (nmod != pnmod) {
if (syscall(__NR_delete_module, NULL, flags) < 0) {
if (errno==EFAULT)
return(ret);
bb_perror_msg_and_die("rmmod");
}
pnmod = nmod;
#ifdef CONFIG_FEATURE_QUERY_MODULE_INTERFACE
/* 1 == QM_MODULES */
if (my_query_module(NULL, 1, &buf, &bufsize, &nmod)) {
bb_perror_msg_and_die("QM_MODULES");
}
#endif
}
#if defined CONFIG_FEATURE_CLEAN_UP && CONFIG_FEATURE_QUERY_MODULE_INTERFACE
free(buf);
#endif
return EXIT_SUCCESS;
default:
bb_show_usage();
}
return EXIT_SUCCESS;
}
if (optind == argc)
bb_show_usage();
{
for (n = optind; n < argc; n++) {
for (n = optind; n < argc; n++) {
#ifdef CONFIG_FEATURE_2_6_MODULES
char module_name[strlen(argv[n]) + 1];
filename2modname(module_name, argv[n]);
const char *afterslash;
char *module_name;
afterslash = strrchr(argv[n], '/');
if (!afterslash)
afterslash = argv[n];
else
afterslash++;
module_name = alloca(strlen(afterslash) + 1);
filename2modname(module_name, afterslash);
#else
#define module_name argv[n]
#endif
if (syscall(__NR_delete_module, module_name, flags) < 0) {
bb_perror_msg("%s", argv[n]);
ret = EXIT_FAILURE;
}
if (syscall(__NR_delete_module, module_name, flags) < 0) {
bb_perror_msg("%s", argv[n]);
ret = EXIT_FAILURE;
}
}