By Warren W Gay
Complicated UNIX Programming is going past the basics of UNIX programming and offers info and methods the readers must extend their wisdom base. Designed for pro UNIX programmers, this booklet builds at the abilities and data the reader already possesses. It contains assurance of net methods, interprocess keep watch over, dossier method manipulation, synchronization, and lots more and plenty extra.
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Additional info for Advanced UNIX Programming (Sams White Book Series)
Tape devices will accept a program's idea of a record (within limits) and write a physical record to tape matching that size. A character device is easily identified by the ls(1) command as shown below: $ ls -l /dev/tty crw-rw-rw- 1 root $ wheel 1, 0 Apr 15 14:56 /dev/tty The device /dev/tty is always known to the current session as your terminal device (the actual device name is different). The first character shown in the ls(1) output is c, telling you that this is a character device. The mouse attached to the console is another example (FreeBSD): $ ls -l /dev/sysmouse crw------- 1 root wheel $ 12, 128 Feb 19 11:05 /dev/sysmouse Here again, you can see that the mouse is considered a character device.
The tone of the message suggests that the sys_errlist array falls short of strerror(3) and thus should be avoided in new code. A possible reason for this is that dynamic content could be provided by the strerror(3) function for errors with codes greater than 152. The strerror(3) Function This is the last of the error code conversion methods that will be examined. h>. h> include file because it reports an error message. However, this function is grouped with the string functions, instead. The strerror(3) function provides the flexibility afforded by the sys_errlist array, but it also performs the necessary range check on the error code being converted.
Another important quality about special files is that their existence does not imply that the device or its driver support exists. 4 Release system you might list a device: $ ls -l /dev/da0 brw-r----- 1 root $ ls -l /dev/rda0 crw-r----- 1 root $ operator 4, 0x00010002 Feb 19 11:05 /dev/da0 operator 13, 0x00010002 Feb 19 11:05 /dev/rda0 The example shows a SCSI disk block and character device. Yet, if you were to switch to root to access this device, you would see the following: # dd if=/dev/da0 of=/dev/null dd: /dev/da0: Device not configured # The dd(1) command is told that the device is not configured (on the particular system on which it was tried).