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int acct(const char *filename);
filename: [in] contains the path of the accounting file, or
NULL.
This call is not part of the plain Linux distribution. If the acct
package is not installed, the call always return -1 and errno is set to
ENOSYS. If the package is installed then the call function
normally. In that case, if filename points to a valid path, the
termination time of each process will be loggued in the filename it
points to. Otherwise, if filename is NULL, then the
accounting function is turned off.
On success zero is returned. On error -1 is returned and errno is
set to reflect the kind of error that occured.
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