ERROR(M) XENIX System V ERROR(M)
Name
error - Kernel error output device.
Description
System error messages are collected and made available to
error logging daemons through the /dev/error device.
/dev/error is a read-only device which returns one error per
read and no EOF character. /etc/rc uses a utility to read
messages from /dev/error and write them to the system error
log file /usr/adm/messages:
/etc/logger /dev/error /usr/adm/messages &
Any process can read /dev/error or arrange to be signaled
when errors are queued in /dev/error. The following ioctl
causes the error device to signal the process with SIGUSR1
when an error message is queued in /dev/error.
#include <signal.h>
#include <syserr.h>
...
int fd;
...
fd = open("/dev/error", O_RDONLY);
ioctl(fd, EMSG_SIG, SIGUSR1);
Before exiting, the process must return /dev/error to its
normal state. Do this with the following ioctl:
...
ioctl(fd,EMSG_NOSIG, 0);
...
Panic error messages are not logged in /dev/error.
Files
/dev/error
See Also
messages(M)
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