snap man page on Plan9

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SNAP(6)								       SNAP(6)

       snap - process snapshots

       Process	snapshots  are	used  to save a process image for debugging on
       another machine or at another time.  They are like old Unix core	 dumps
       but can hold multiple process images and are smaller.

       The  first  line	 of  a snapshot begins with the prefix ``process snap‐
       shot'' and often contains other information as well, such  as  creation
       time, user name, system name, cpu type, and kernel type.	 This informa‐
       tion is intended for humans, not programs.  Programs reading  snapshots
       should only check that this line begins with the specified prefix.

       Throughout  the rest of the snapshot, decimal strings are always right-
       justified, blank-padded to at least 11 characters, and  followed	 by  a
       single space character.

       The  rest  of the snapshot is one or more records, each of which begins
       with a one-line header.	This header is a decimal process  id  followed
       by  an  identification  string,	which  denotes the type of data in the

       Records of type fd, fpregs, kregs, noteid, ns, proc, regs, segment, and
       status  are  all formatted as a decimal number n followed by n bytes of
       data.  This data is the contents of the file of the same name found  in

       The  format  of the mem and text sections is not as simple.  These sec‐
       tions contain one or more page  descriptions.   Each  describes	a  one
       kilobyte	 page of data.	If the section is not a multiple of a kilobyte
       in size, the last page will be shorter.	Each description begins with a
       one-byte	 flag.	 If  the  flag	is r, then it is followed by a page of
       binary data.  If the flag is z, then  the  data	is  understood	to  be
       zeros,  and  is omitted.	 If the flag is m or t, then it is followed by
       two decimal strings p and o, indicating that this page is the  same  as
       the page at offset o of the memory or text segment for process p.  This
       data must have been previously described in the snapshot, and the  off‐
       set must be a multiple of a kilobyte.

       It  is  not guaranteed that any of the sections described above be in a
       process snapshot, although the snapshot quickly	becomes	 useless  when
       too much is missing.

       Memory  and text images may be incomplete.  The memory or text file for
       a given process may be split across multiple disjoint sections  in  the

       proc(3), snap(4).

                             _         _         _ 
                            | |       | |       | |     
                            | |       | |       | |     
                         __ | | __ __ | | __ __ | | __  
                         \ \| |/ / \ \| |/ / \ \| |/ /  
                          \ \ / /   \ \ / /   \ \ / /   
                           \   /     \   /     \   /    
                            \_/       \_/       \_/ 
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