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Man Pages


Manual Reference Pages  -  ACCT (2)

NAME

acct - enable or disable process accounting

CONTENTS

Library
Synopsis
Description
Notes
Return Values
Errors
See Also
History

LIBRARY


.Lb libc

SYNOPSIS


.In unistd.h int acct const char *file

DESCRIPTION

The acct system call enables or disables the collection of system accounting records. If the argument file is a null pointer, accounting is disabled. If file is an existing pathname (null-terminated), record collection is enabled and for every process initiated which terminates under normal conditions an accounting record is appended to file. Abnormal conditions of termination are reboots or other fatal system problems. Records for processes which never terminate cannot be produced by acct.

For more information on the record structure used by acct, see
.In sys/acct.h and acct(5).

This call is permitted only to the super-user.

NOTES

Accounting is automatically disabled when the file system the accounting file resides on runs out of space; it is enabled when space once again becomes available. The values controlling this behaviour can be modified using the following sysctl(8) variables:
kern.acct_chkfreq
  Specifies the frequency (in seconds) with which free disk space should be checked.
kern.acct_resume The percentage of free disk space above which process accounting will resume.
kern.acct_suspend
  The percentage of free disk space below which process accounting will suspend.

RETURN VALUES

On error -1 is returned. The file must exist and the call may be exercised only by the super-user.

ERRORS

The acct system call will fail if one of the following is true:
[EPERM]
  The caller is not the super-user.
[ENOTDIR]
  A component of the path prefix is not a directory.
[ENAMETOOLONG]
  A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
[ENOENT]
  The named file does not exist.
[EACCES]
  Search permission is denied for a component of the path prefix, or the path name is not a regular file.
[ELOOP]
  Too many symbolic links were encountered in translating the pathname.
[EROFS]
  The named file resides on a read-only file system.
[EFAULT]
  The file argument points outside the process’s allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.

SEE ALSO

acct(5), accton(8), sa(8)

HISTORY

The acct function appeared in AT&T v7 .
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