kvm_getprocs man page on 4.4BSD

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

     kvm_getprocs, kvm_getargv, kvm_getenvv — access user process state

     #include <kvm.h>
     #include <sys/kinfo.h>
     #include <sys/kinfo_proc.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);

     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 fil‐
     tering predicate as follows:

	   KINFO_PROC_ALL	 all processes
	   KINFO_PROC_PID	 processes with process id arg
	   KINFO_PROC_PGRP	 processes with process group arg
	   KINFO_PROC_SESSION	 processes with session arg
	   KINFO_PROC_TTY	 processes with tty arg
	   KINFO_PROC_UID	 processes with effective user id arg
	   KINFO_PROC_RUID	 processes with real user 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 struc‐
     tures.  This memory is locally allocated, and subsequent calls to
     kvm_getprocs() and kvm_close() will overwrite this storage.

     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 con‐
     trol 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

     kvm_getprocs(), kvm_getargv(), and kvm_getenvv(), all return NULL on

     These routines do not belong in the kvm interface.

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

BSD				 June 4, 1993				   BSD

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