DESCRIPTION

     When called with the name of an existing file  as  argument,
     accounting  is  turned on, records for each terminating pro-
     cess are appended to filename as it terminates.  An argument
     of NULL causes accounting to be turned off.

RETURN VALUE

     On success, zero is returned.  On error, -1 is returned, and
     errno is set appropriately.

ERRORS

     ENOSYS  BSD process accounting has not been enabled when the
             operating  system  kernel  was compiled.  The kernel
             configuration parameter controlling this feature  is
             CONFIG_BSD_PROCESS_ACCT.

     ENOMEM  Out of memory.

     EPERM   The calling process has no permission to enable pro-
             cess accounting.

     EACCESS The argument filename is not a regular file.

     EIO     Error writing to the file filename.

     EUSERS  There are no more free file structures or we run out
             of memory.

CONFORMING TO

     SVr4 (but not POSIX).  SVr4 documents EACCES, EBUSY, EFAULT,
     ELOOP,  ENAMETOOLONG, ENOTDIR, ENOENT, EPERM and EROFS error
     conditions, but no ENOSYS.

NOTES

     No accounting is produced for programs running when a  crash
     occurs.   In  particular, nonterminating processes are never
     accounted for.