By Alan Holt, Chi-Yu Huang
This practically-oriented textbook presents a transparent advent to different part elements of an working process and the way those interact. The easy-to-follow textual content covers the bootloader, kernel, filesystem, shared libraries, start-up scripts, configuration records and process utilities. The strategy for construction every one part is defined intimately, guiding the reader in the course of the means of making a totally sensible GNU/Linux embedded OS. positive factors: offers a concise review of the GNU/Linux process, and a close evaluation of GNU/Linux filesystems; describes the way to construct an embedded process to run on a digital laptop, and to run natively on a precise processor; introduces the idea that of the compiler toolchain, demonstrating tips on how to enhance a move toolchain in order that courses may be equipped on more than a few diverse architectures; discusses the ARM-based systems BeagleBone and Raspberry Pi; explains how one can construct OpenWRT firmware photos for OMxP Open-mesh units and the Dragino MS14 series.
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Additional info for Embedded Operating Systems: A Practical Approach
If an existing variable is specified then it will only change to the specified value if the overwrite is 1. In the example below the variable GREET already exists. The value of GREET is unchanged after the setenv() function call because the overwrite parameter is 0. /setenv GREET hello 1 GREET before setenv() is welcome GREET after setenv() is hello Environment variables can also be created and set with the function putenv(). The putenv() function places an entry onto the environment list in the form name = value.
In this subsection we will discuss, with examples, the other file objects found within the filesystem. The list below serves as a reminder of these file objects: • • • • Device files (special files) FIFOs (named pipes) Unix domain sockets Symbolic links. 2 Device Files Device files are input/output interfaces to device drivers. Just like regular files, device files have directory entries and inodes but unlike regular files, devices are not allocated blocks on any disk (other than for their inode).
The default action performed by a process when it receives a signal depends on the signal type. Most (like SIGKILL) cause the process to terminate. Others like SIGQUIT cause the process to terminate and generate a core dump. 5 Process Management 21 Start a process to sleep for 300 s (five min): $ ( sleep 300 ) If we wish to terminate the process before five min has elapsed, we can send the process a signal. Some signals can be sent using keyboard control characters. ; start = ˆQ; stop = ˆS; susp = ˆZ; rprnt = ˆR; werase = ˆW; lnext = ˆV; flush = ˆO; min = 1; time = 0; -parenb -parodd cs8 hupcl -cstopb cread -clocal -crtscts -ignbrk brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc ixany imaxbel iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke We can see from the output above that the CONTROL-C key sequence generates an intr (SIGINT) signal.
Embedded Operating Systems: A Practical Approach by Alan Holt, Chi-Yu Huang