mirror of
https://github.com/schoebel/mars
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135 lines
2.3 KiB
C
135 lines
2.3 KiB
C
// (c) 2011 Thomas Schoebel-Theuer / 1&1 Internet AG
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//#define BRICK_DEBUGGING
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//#define MARS_DEBUGGING
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//#define IO_DEBUGGING
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sysctl.h>
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#include <linux/uaccess.h>
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#include "strategy.h"
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#include "mars_proc.h"
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mars_info_fn mars_info = NULL;
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static
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int trigger_sysctl_handler(ctl_table *table,
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int write,
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void __user *buffer,
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size_t *length,
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loff_t *ppos)
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{
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ssize_t res = 0;
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size_t len = *length;
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MARS_DBG("write = %d len = %ld pos = %lld\n", write, len, *ppos);
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if (!len || *ppos > 0) {
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goto done;
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}
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if (write) {
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char tmp[8] = {};
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int code = 0;
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res = len; // fake consumption of all data
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if (len > 7)
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len = 7;
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if (!copy_from_user(tmp, buffer, len)) {
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sscanf(tmp, "%d", &code);
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if (code) {
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mars_trigger();
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}
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}
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} else {
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char *answer = "MARS module not loaded\n";
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char *tmp = NULL;
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int mylen;
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if (mars_info) {
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answer = "internal error while determining mars_info\n";
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tmp = mars_info();
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if (tmp)
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answer = tmp;
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}
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mylen = strlen(answer);
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if (len > mylen)
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len = mylen;
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res = len;
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if (copy_to_user(buffer, answer, len)) {
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MARS_ERR("write %ld bytes at %p failed\n", len, buffer);
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res = -EFAULT;
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}
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brick_string_free(tmp);
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}
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done:
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MARS_DBG("res = %ld\n", res);
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*length = res;
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if (res >= 0) {
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*ppos += res;
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return 0;
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}
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return res;
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}
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static
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ctl_table mars_table[] = {
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "trigger",
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.mode = 0200,
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.proc_handler = &trigger_sysctl_handler,
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},
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{}
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};
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static
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ctl_table mars_root_table[] = {
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "mars",
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.mode = 0500,
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.child = mars_table,
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},
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{}
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};
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////////////////// module init stuff /////////////////////////
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static struct ctl_table_header *header = NULL;
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int __init init_mars_proc(void)
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{
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MARS_INF("init_proc()\n");
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header = register_sysctl_table(mars_root_table);
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return 0;
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}
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void __exit exit_mars_proc(void)
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{
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MARS_INF("exit_proc()\n");
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if (header) {
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unregister_sysctl_table(header);
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header = NULL;
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}
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}
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#ifndef CONFIG_MARS_HAVE_BIGMODULE
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MODULE_DESCRIPTION("MARS /proc/ infrastructure");
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MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
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MODULE_LICENSE("GPL");
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module_init(init_mars_proc);
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module_exit(exit_mars_proc);
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#endif
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