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download PDF document: acct.2.pdf

ACCT(2) FreeBSD System Calls Manual ACCT(2)
NAME acct - enable or disable process accounting
LIBRARY Standard C Library (libc, -lc)
SYNOPSIS #include <unistd.h>
int acct(const char *file);
DESCRIPTION The acct() system call enables or disables the collection of system accounting records. If the argument file is a null pointer, accounting is disabled. If 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 file. Abnormal conditions of termination are reboots or other fatal system problems. Records for processes which never terminate cannot be produced by acct().
For more information on the record structure used by acct(), see <sys/acct.h> and acct(5).
This call is permitted only to the super-user.
NOTES Accounting 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:
kern.acct_chkfreq Specifies the frequency (in seconds) with which free disk space should be checked.
kern.acct_resume The percentage of free disk space above which process accounting will resume.
kern.acct_suspend The percentage of free disk space below which process accounting will suspend.
RETURN VALUES On error -1 is returned. The file must exist and the call may be exercised only by the super-user.
ERRORS The acct() system call will fail if one of the following is true:
[EPERM] The caller is not the super-user.
[ENOTDIR] A component of the path prefix is not a directory.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
[ENOENT] The named file does not exist. [EROFS] The named file resides on a read-only file system.
[EFAULT] The file argument points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the file system.
[EINTEGRITY] Corrupted data was detected while reading from the file system.
SEE ALSO acct(5), accton(8), sa(8)
HISTORY The acct() function appeared in Version 7 AT&T UNIX.
FreeBSD 14.0-RELEASE-p6 March 30, 2020 FreeBSD 14.0-RELEASE-p6