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Full Discussion: Ps command source.
Top Forums Shell Programming and Scripting Ps command source. Post 302767095 by MadeInGermany on Wednesday 6th of February 2013 07:36:36 AM
Old 02-06-2013
I don't know the SCO Openserver in detail.
But this problem is common to most if not all Unix.
There is a kernel memory access device like /dev/kmem, or a special /proc filesystem that provides access to some selected kernel memory.
Usually the process args are fully known only to the process itself,
while the kernel maintains a common area of all process args that is limited to usually 80 characters.
The ps command accesses the common kernel area, therefore the truncation.
The Solaris OS has "/usr/ucb/ps axww" that (with root rights) visits each process's private memory to provide full args.
 

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MEM(4)                                                       Linux Programmer's Manual                                                      MEM(4)

NAME
mem, kmem, port - system memory, kernel memory and system ports DESCRIPTION
/dev/mem is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even patch) the system. Byte addresses in /dev/mem are interpreted as physical memory addresses. References to nonexistent locations cause errors to be returned. Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present. Since Linux 2.6.26, and depending on the architecture, the CONFIG_STRICT_DEVMEM kernel configuration option limits the areas which can be accessed through this file. For example: on x86, RAM access is not allowed but accessing memory-mapped PCI regions is. It is typically created by: mknod -m 660 /dev/mem c 1 1 chown root:kmem /dev/mem The file /dev/kmem is the same as /dev/mem, except that the kernel virtual memory rather than physical memory is accessed. Since Linux 2.6.26, this file is available only if the CONFIG_DEVKMEM kernel configuration option is enabled. It is typically created by: mknod -m 640 /dev/kmem c 1 2 chown root:kmem /dev/kmem /dev/port is similar to /dev/mem, but the I/O ports are accessed. It is typically created by: mknod -m 660 /dev/port c 1 4 chown root:kmem /dev/port FILES
/dev/mem /dev/kmem /dev/port SEE ALSO
chown(1), mknod(1), ioperm(2) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2015-01-02 MEM(4)
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