servers/vfs/gcov.c

   1
   2 #include "fs.h"
   3 #include "file.h"
   4 #include "fproc.h"
   5
   6 int gcov_flush(cp_grant_id_t grantid, size_t size );
   7
   8 /*===========================================================================*
   9  *                              do_gcov_flush                           *
  10  *===========================================================================*/
  11 int do_gcov_flush()
  12 {
  13 /* A userland tool has requested the gcov data from another
  14  * process (possibly vfs itself). Grant the target process
  15  * access to the supplied buffer, and perform the call that
  16  * makes the target copy its buffer to the caller (incl vfs
  17  * itself).
  18  */
  19   struct fproc *rfp;
  20   ssize_t size;
  21   cp_grant_id_t grantid;
  22   int r, n;
  23   pid_t target;
  24   message m;
  25   vir_bytes buf;
  26
  27   size = job_m_in.GCOV_BUFF_SZ;
  28   target = job_m_in.GCOV_PID;
  29   buf = (vir_bytes) job_m_in.GCOV_BUFF_P;
  30
  31   /* If the wrong process is sent to, the system hangs; so make this root-only.
  32    */
  33
  34   if (!super_user) return(EPERM);
  35
  36   /* Find target gcov process. */
  37   for(n = 0; n < NR_PROCS; n++) {
  38         if(fproc[n].fp_endpoint != NONE && fproc[n].fp_pid == target)
  39                  break;
  40   }
  41   if(n >= NR_PROCS) {
  42         printf("VFS: gcov process %d not found\n", target);
  43         return(ESRCH);
  44   }
  45   rfp = &fproc[n];
  46
  47   /* Grant target process to requestor's buffer. */
  48   if ((grantid = cpf_grant_magic(rfp->fp_endpoint, who_e, buf,
  49                                  size, CPF_WRITE)) < 0) {
  50         printf("VFS: gcov_flush: grant failed\n");
  51         return(ENOMEM);
  52   }
  53
  54   if (rfp->fp_endpoint == VFS_PROC_NR) {
  55         /* Request is for VFS itself. */
  56         r = gcov_flush(grantid, size);
  57   } else {
  58         /* Perform generic GCOV request. */
  59         m.GCOV_GRANT = grantid;
  60         m.GCOV_BUFF_SZ = size;
  61         r = _taskcall(rfp->fp_endpoint, COMMON_REQ_GCOV_DATA, &m);
  62   }
  63
  64   cpf_revoke(grantid);
  65
  66   return(r);
  67 }