acct - switch process accounting on or off
int acct(const char *filename));
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.
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
ENOSYS BSD process accounting has not been enabled when the
operating system kernel was compiled. The kernel
configuration parameter controlling this feature is
ENOMEM Out of memory.
EPERM The calling process has no permission to enable pro-
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
SVr4 (but not POSIX). SVr4 documents EACCES, EBUSY, EFAULT,
ELOOP, ENAMETOOLONG, ENOTDIR, ENOENT, EPERM and EROFS error
conditions, but no ENOSYS.
No accounting is produced for programs running when a crash
occurs. In particular, nonterminating processes are never