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       acct - switch process accounting on or off


       #include <unistd.h>

       int acct(const char *filename);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

           Since glibc 2.21:
           In glibc 2.19 and 2.20:
               _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
           Up to and including glibc 2.19:
               _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)


       The acct() system call enables or disables process accounting.  If called with the name of
       an existing file  as  its  argument,  accounting  is  turned  on,  and  records  for  each
       terminating process 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.


       EACCES Write permission is denied for the specified file, or search permission  is  denied
              for   one   of   the   directories  in  the  path  prefix  of  filename  (see  also
              path_resolution(7)), or filename is not a regular file.

       EFAULT filename points outside your accessible address space.

       EIO    Error writing to the file filename.

       EISDIR filename is a directory.

       ELOOP  Too many symbolic links were encountered in resolving filename.

              filename was too long.

       ENFILE The system-wide limit on the total number of open files has been reached.

       ENOENT The specified file does not exist.

       ENOMEM Out of memory.

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

              A component used as a directory in filename is not in fact a directory.

       EPERM  The calling process has insufficient privilege to enable  process  accounting.   On
              Linux, the CAP_SYS_PACCT capability is required.

       EROFS  filename refers to a file on a read-only filesystem.

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


       SVr4, 4.3BSD (but not POSIX).


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

       The structure of the records written to the accounting file is described in acct(5).




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