74 lines
1.6 KiB
C
74 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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/*===========================================================================*
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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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int i;
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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;
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int n;
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pid_t target;
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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;
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* 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 &&
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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 proccess %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,
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who_e, (vir_bytes) m_in.GCOV_BUFF_P,
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size, 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(target == getpid()) {
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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_out.GCOV_GRANT = grantid;
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m_out.GCOV_BUFF_SZ = size;
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r = _taskcall(rfp->fp_endpoint, COMMON_REQ_GCOV_DATA, &m_out);
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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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