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kvm_getargv (3)
  • >> kvm_getargv (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    kvm_getprocs
    
     
    kvm_getargv
    
     
    kvm_getenvv
    
     - access user process state
    
     
    

    LIBRARY

    Lb libkvm
    
     
    

    SYNOPSIS

       #include <kvm.h>
       #include <sys/param.h>
       #include <sys/sysctl.h>
       #include <sys/user.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);
     

    DESCRIPTION

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

    KERN_PROC_ALL
    all processes and kernel visible threads
    KERN_PROC_PROC
    all processes, without threads
    KERN_PROC_PID
    processes with process ID Fa arg
    KERN_PROC_PGRP
    processes with process group Fa arg
    KERN_PROC_SESSION
    processes with session Fa arg
    KERN_PROC_TTY
    processes with TTY Fa arg
    KERN_PROC_UID
    processes with effective user ID Fa arg
    KERN_PROC_RUID
    processes with real user ID Fa arg
    KERN_PROC_INC_THREAD
    modifier to return all kernel visible threads when filtering by process ID, process group, TTY, user ID, and real user ID

    The number of processes found is returned in the reference parameter Fa 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.

    The kvm_getargv ();
    function returns a null-terminated argument vector that corresponds to the command line arguments passed to process indicated by Fa 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 Fa 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 Fa 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_close3 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.  

    RETURN VALUES

    The kvm_getprocs (,);
    kvm_getargv (,);
    and kvm_getenvv ();
    functions return NULL on failure.  

    SEE ALSO

    kvm(3), kvm_close3, kvm_geterr3, kvm_nlist3, kvm_open3, kvm_openfiles3, kvm_read3, kvm_write3  

    BUGS

    These routines do not belong in the kvm interface.

    In order for kvm_getenvv3 to function correctly, procfs(5) must be mounted on /proc


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    SEE ALSO
    BUGS


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