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