minix/servers/vfs/gcov.c

73 lines
1.6 KiB
C

#include "fs.h"
#include "file.h"
#include "fproc.h"
/*===========================================================================*
* do_gcov_flush *
*===========================================================================*/
PUBLIC int do_gcov_flush()
{
/* A userland tool has requested the gcov data from another
* process (possibly vfs itself). Grant the target process
* access to the supplied buffer, and perform the call that
* makes the target copy its buffer to the caller (incl vfs
* itself).
*/
int i;
struct fproc *rfp;
ssize_t size;
cp_grant_id_t grantid;
int r;
int n;
pid_t target;
size = m_in.GCOV_BUFF_SZ;
target = m_in.GCOV_PID;
/* If the wrong process is sent to, the system hangs;
* so make this root-only.
*/
if (!super_user) return(EPERM);
/* Find target gcov process. */
for(n = 0; n < NR_PROCS; n++) {
if(fproc[n].fp_endpoint != NONE &&
fproc[n].fp_pid == target)
break;
}
if(n >= NR_PROCS) {
printf("VFS: gcov proccess %d not found.\n", target);
return ESRCH;
}
rfp = &fproc[n];
/* Grant target process to requestor's buffer. */
if((grantid = cpf_grant_magic(rfp->fp_endpoint,
who_e, (vir_bytes) m_in.GCOV_BUFF_P,
size, CPF_WRITE)) < 0) {
printf("VFS: gcov_flush: grant failed\n");
return ENOMEM;
}
if(target == getpid()) {
/* Request is for VFS itself. */
r = gcov_flush(grantid, size);
} else {
/* Perform generic GCOV request. */
m_out.GCOV_GRANT = grantid;
m_out.GCOV_BUFF_SZ = size;
r = _taskcall(rfp->fp_endpoint, COMMON_REQ_GCOV_DATA, &m_out);
}
cpf_revoke(grantid);
return r;
}