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NetBSD 6.1.5 - man page for kvm_getproc2 (netbsd section 3)

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KVM_GETPROCS(3) 		   BSD Library Functions Manual 		  KVM_GETPROCS(3)

NAME
     kvm_getprocs, kvm_getargv, kvm_getenvv -- access user process state

LIBRARY
     Kernel Data Access Library (libkvm, -lkvm)

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

     struct kinfo_proc *
     kvm_getprocs(kvm_t *kd, int op, int arg, int *cnt);

     char **
     kvm_getargv(kvm_t *kd, const struct kinfo_proc *p, int nchr);

     char **
     kvm_getenvv(kvm_t *kd, const struct kinfo_proc *p, int nchr);

     struct kinfo_proc2 *
     kvm_getproc2(kvm_t *kd, int op, int arg, int elemsize, int *cnt);

     char **
     kvm_getargv2(kvm_t *kd, const struct kinfo_proc2 *p, int nchr);

     char **
     kvm_getenvv2(kvm_t *kd, const struct kinfo_proc2 *p, int nchr);

DESCRIPTION
     kvm_getprocs() returns a (sub-)set of active processes in the kernel indicated by kd.  The
     op and arg arguments constitute a predicate which limits the set of processes returned.  The
     value of op describes the filtering predicate as follows:

	   KERN_PROC_ALL	 all processes
	   KERN_PROC_PID	 processes with process id arg
	   KERN_PROC_PGRP	 processes with process group arg
	   KERN_PROC_SESSION	 processes with session id arg
	   KERN_PROC_TTY	 processes with tty device arg
	   KERN_PROC_UID	 processes with effective user id arg
	   KERN_PROC_RUID	 processes with real user id arg
	   KERN_PROC_GID	 processes with effective group id arg
	   KERN_PROC_RGID	 processes with real group id arg

     The number of processes found is returned in the reference parameter cnt.	The processes are
     returned as a contiguous array of kinfo_proc structures.  This memory is locally allocated,
     and subsequent calls to kvm_getprocs() and kvm_close() will overwrite this storage.

     If the op argument for kvm_getprocs() is KERN_PROC_TTY, arg can also be KERN_PROC_TTY_NODEV
     to select processes with no controlling tty and KERN_PROC_TTY_REVOKE to select processes
     which have had their controlling tty revoked.

     kvm_getargv() returns a null-terminated argument vector that corresponds to the command line
     arguments passed to process indicated by p.  Most likely, these arguments correspond to the
     values passed to exec(3) on process creation.  This information is, however, deliberately
     under control of the process itself.  Note that the original command name can be found,
     unaltered, in the p_comm field of the process structure returned by kvm_getprocs().

     The nchr argument indicates the maximum number of characters, including null bytes, to use
     in building the strings.  If this amount is exceeded, the string causing the overflow is
     truncated and the partial result is returned.  This is handy for programs like ps(1) and
     w(1) that print only a one line summary of a command and should not copy out large amounts
     of text only to ignore it.  If nchr is zero, no limit is imposed and all argument strings
     are returned in their entirety.

     The memory allocated to the argv pointers and string storage is owned by the kvm library.
     Subsequent kvm_getprocs() and kvm_close(3) calls will clobber this storage.

     The kvm_getenvv() function is similar to kvm_getargv() but returns the vector of environment
     strings.  This data is also alterable by the process.

     kvm_getproc2() is similar to kvm_getprocs() but returns an array of kinfo_proc2 structures.
     Additionally, only the first elemsize bytes of each array entry are returned.  If the size
     of the kinfo_proc2 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_getproc2() will continue to function without the need for recompilation.

     The kvm_getargv2() and kvm_getenvv2() are equivalents to the kvm_getargv() and kvm_getenvv()
     functions but use a kinfo_proc2 structure to specify the process.

     If called against an active kernel, the kvm_getproc2(), kvm_getargv2(), and kvm_getenvv2()
     functions will use the sysctl(3) interface and do not require access to the kernel memory
     device file or swap device.

RETURN VALUES
     kvm_getprocs(), kvm_getargv(), kvm_getenvv(), kvm_getproc2(), kvm_getargv2(), and
     kvm_getenvv2() all return NULL on failure.

SEE ALSO
     kvm(3), kvm_close(3), kvm_geterr(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.

BSD					February 10, 2004				      BSD
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