minix/usr.bin/trace/ioctl/svrctl.c

   1
   2 #include "inc.h"
   3
   4 #include <sys/svrctl.h>
   5
   6 const char *
   7 svrctl_name(unsigned long req)
   8 {
   9
  10         switch (req) {
  11         NAME(PMSETPARAM);
  12         NAME(PMGETPARAM);
  13         NAME(VFSGETPARAM);
  14         NAME(VFSSETPARAM);
  15         }
  16
  17         return NULL;
  18 }
  19
  20 int
  21 svrctl_arg(struct trace_proc * proc, unsigned long req, void * ptr, int dir)
  22 {
  23         struct sysgetenv *env;
  24
  25         switch (req) {
  26         case PMSETPARAM:
  27         case VFSSETPARAM:
  28                 if ((env = (struct sysgetenv *)ptr) == NULL)
  29                         return IF_OUT;
  30
  31                 put_buf(proc, "key", PF_STRING, (vir_bytes)env->key,
  32                     env->keylen);
  33                 put_buf(proc, "value", PF_STRING, (vir_bytes)env->val,
  34                     env->vallen);
  35                 return IF_ALL;
  36
  37         case PMGETPARAM:
  38         case VFSGETPARAM:
  39                 if ((env = (struct sysgetenv *)ptr) == NULL)
  40                         return IF_OUT | IF_IN;
  41
  42                 /*
  43                  * So far this is the only IOCTL case where the output depends
  44                  * on one of the values in the input: if the given key is NULL,
  45                  * PM provides the entire system environment in return, which
  46                  * means we cannot just print a single string.  We rely on PM
  47                  * not changing the key field, which (while true) is an
  48                  * assumption.  With the current (simple) model we would have
  49                  * to save the provided key pointer somewhere otherwise.
  50                  */
  51                 if (dir == IF_OUT)
  52                         put_buf(proc, "key", PF_STRING, (vir_bytes)env->key,
  53                             env->keylen);
  54                 else
  55                         put_buf(proc, "value",
  56                             (env->key != NULL) ? PF_STRING : 0,
  57                             (vir_bytes)env->val, env->vallen);
  58                 return IF_ALL;
  59
  60         default:
  61                 return 0;
  62         }
  63 }