ACCT(2)

NAME
acct - enable or disable process accounting

LIBRARY
libc

SYNOPSIS
#include <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 nil 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 <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 UNIX.