kvm_getlwps(3) - NetBSD Manual Pages

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KVM_GETLWPS(3)          NetBSD Library Functions Manual         KVM_GETLWPS(3)


NAME

     kvm_getlwps -- access state of LWPs belonging to a user process


LIBRARY

     Kernel Data Access Library (libkvm, -lkvm)


SYNOPSIS

     #include <kvm.h>
     #include <sys/param.h>
     #include <sys/sysctl.h>

     struct kinfo_lwp *
     kvm_getlwps(kvm_t *kd, int pid, unsigned long procaddr, size_t elemsize,
         int *cnt);


DESCRIPTION

     kvm_getlwps() returns the set of LWPs belonging to the process specified
     by pid or procaddr in the kernel indicated by kd.  The number of LWPs
     found is returned in the reference parameter cnt.  The LWPs are returned
     as a contiguous array of kinfo_lwp structures.  This memory is locally
     allocated, and subsequent calls to kvm_getlwps() and kvm_close() will
     overwrite this storage.

     Only the first elemsize bytes of each array entry are returned.  If the
     size of the kinfo_lwp structure increases in size in a future release of
     NetBSD the kernel will only return the requested amount of data for each
     array entry and programs that use kvm_getlwps() will continue to function
     without the need for recompilation.

     If called against an active kernel, the kvm_getlwps() function will use
     the sysctl(3) interface and return information about the process identi-
     fied by pid; otherwise the kernel memory device file or swap device will
     be accessed and the process is identified by the location passed in
     paddr.


RETURN VALUES

     kvm_getlwps() returns NULL on failure.


SEE ALSO

     kvm(3), kvm_close(3), kvm_geterr(3), kvm_getproc2(3), kvm_getprocs(3),
     kvm_nlist(3), kvm_open(3), kvm_openfiles(3), kvm_read(3), kvm_write(3)


BUGS

     These routines do not belong in the kvm interface.

NetBSD 10.1                     January 9, 2018                    NetBSD 10.1