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NAMEacct - enable or disable process accounting
SYNOPSISIn unistd.h Ft int Fn acct const char *file
DESCRIPTIONThe Fn acct system call enables or disables the collection of system accounting records. If the argument Fa file is a null pointer, accounting is disabled. If Fa file is an existing pathname (null-terminated), record collection is enabled and for every process initiated which terminates under normal conditions an accounting record is appended to Fa file . Abnormal conditions of termination are reboots or other fatal system problems. Records for processes which never terminate cannot be produced by Fn acct .
For more information on the record structure used by Fn acct , see In sys/acct.h and acct(5).
This call is permitted only to the super-user.
NOTESAccounting 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. The values controlling this behaviour can be modified using the following sysctl(8) variables:
- Specifies the frequency (in seconds) with which free disk space should be checked.
- The percentage of free disk space above which process accounting will resume.
- The percentage of free disk space below which process accounting will suspend.
RETURN VALUESOn error -1 is returned. The file must exist and the call may be exercised only by the super-user.
ERRORSThe Fn acct system call will fail if one of the following is true:
- Bq Er EPERM
- The caller is not the super-user.
- Bq Er ENOTDIR
- A component of the path prefix is not a directory.
- Bq Er ENAMETOOLONG
- A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
- Bq Er ENOENT
- The named file does not exist.
- Bq Er EACCES
- Search permission is denied for a component of the path prefix, or the path name is not a regular file.
- Bq Er ELOOP
- Too many symbolic links were encountered in translating the pathname.
- Bq Er EROFS
- The named file resides on a read-only file system.
- Bq Er EFAULT
- The Fa file argument points outside the process's allocated address space.
- Bq Er EIO
- An I/O error occurred while reading from or writing to the file system.