minix/servers/vfs/gcov.c

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