The system is prepared to write a record in an accounting file for each process as it terminates. This call,
with a null-terminated string naming an existing file as argument, turns on accounting; records for each ter-
minating process are appended to file. An argument of 0 causes accounting to be turned off.
The accounting file format is given in acct(5).
This call is permitted only to the super-user.
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.
On error -1 is returned. The file must exist and the call may be exercised only by the super-user. It is
erroneous to try to turn on accounting when it is already on.
Acct 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.
[EINVAL] The pathname contains a character with the high-order bit set.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 charac-
[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 regu-
[ELOOP] Too many symbolic links were encountered in translating the pathname.
[EROFS] The named file resides on a read-only file system.
[EFAULT] File points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.