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Full Discussion: Implement ps command in C
Top Forums Programming Implement ps command in C Post 302873027 by Don Cragun on Monday 11th of November 2013 03:24:55 AM
Old 11-11-2013
The details provided by the /proc filesystem (and even if it exists) varies widely from system to system. On systems where it is present, it reflects data found in the kernel's process table (which also varies considerably from system to system).
Code:
man /proc

may provide information about how /proc is implemented on your system.

Unlike many "standard" utilities, the code needed to implement ps is not at all portable. On systems that don't support /proc, ps is frequently a set-UID root process that extracts data directly from the kernel's process table by reading /dev/kmem (another interface that is not available on all systems).
 

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LEARN ABOUT ULTRIX

systemd-remount-fs.service

SYSTEMD-REMOUNT-FS.SERVICE(8)				    systemd-remount-fs.service				     SYSTEMD-REMOUNT-FS.SERVICE(8)

NAME

       systemd-remount-fs.service, systemd-remount-fs - Remount root and kernel file systems

SYNOPSIS

       systemd-remount-fs.service

       /lib/systemd/systemd-remount-fs

DESCRIPTION

       systemd-remount-fs.service is an early boot service that applies mount options listed in fstab(5) to the root file system, the /usr file
       system, and the kernel API file systems. This is required so that the mount options of these file systems -- which are pre-mounted by the
       kernel, the initial RAM disk, container environments or system manager code -- are updated to those listed in /etc/fstab. This service
       ignores normal file systems and only changes the root file system (i.e.	/), /usr and the virtual kernel API file systems such as /proc,
       /sys or /dev. This service executes no operation if /etc/fstab does not exist or lists no entries for the mentioned file systems.

       For a longer discussion of kernel API file systems see API File Systems[1].

SEE ALSO

       systemd(1), fstab(5), mount(8)

NOTES

	1. API File Systems
	   https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems

systemd 237													     SYSTEMD-REMOUNT-FS.SERVICE(8)
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