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1.1 root 1: .\" Copyright (c) 1986 Regents of the University of California.
2: .\" All rights reserved. The Berkeley software License Agreement
3: .\" specifies the terms and conditions for redistribution.
4: .\"
5: .\" @(#)2.t 6.6 (Berkeley) 4/14/86
6: .\"
7: .SH
8: .LG
9: .ce
10: Section 2
11: .SM
12: .sp
13: .PP
14: The error codes for Section 2 entries have been carefully
15: scrutinized to insure that the documentation properly reflects
16: the source code. User-visible changes in this section lie
17: mostly in the area of the interprocess communication facilities;
18: the Xerox Network System communication procotocols have
19: been added and the existing communication facilities have
20: been extended and made more robust.
21: .PP
22: .BP adjtime
23: A new system call which skews the system clock
24: to correct the time of day.
25: .BP fcntl
26: The FASYNC option to enable the SIGIO signal
27: now works with sockets as well as with ttys.
28: The interpretation of process groups set with F_SETOWN
29: is the same for sockets and for ttys:
30: negative values refer to process groups,
31: positive values to processes.
32: This is the reverse of the previous interpretation
33: of socket process groups set using \fIioctl\fP to enable SIGURG.
34: .BP kill
35: The error returned when trying to signal one's own process group
36: when no process group is set was changed to ESRCH.
37: Signal 0 can now be used as documented.
38: .BP lseek
39: Returns an ESPIPE error when seeking on sockets
40: (including pipes) for backward compatibility.
41: .BP open
42: When doing an open with flags O_CREAT and O_EXCL (create only if the file
43: did not exist), it is now considered to be an error if the target exists
44: and is a symbolic link, even if the symbolic link refers to a nonexistent
45: file.
46: This behavior was added for the security of programs that
47: need to create
48: files with predictable names.
49: .BP ptrace
50: A new header file, <\fIsys/ptrace.h\fP>, defines the request types.
51: When the process being traced stops, the parent now receives a SIGCHLD.
52: .BP readlink
53: Returns EINVAL instead of ENXIO when trying to read something other
54: than a symbolic link.
55: .BP rename
56: If the ISVTX (sticky text) bit is set in the mode of a directory,
57: files in that directory may not be the source or target of a \fIrename\fP
58: except by the owner of the file, the owner of the directory, or the superuser.
59: .BP select
60: Now handles more descriptors.
61: The mask arguments to \fIselect\fP are now treated as
62: pointers to arrays of integers, with the first argument determining the size
63: of the array.
64: A set of macros in
65: <\fIsys/types.h\fP> is provided for manipulating the file descriptor sets.
66: The descriptor masks are only modified when no error is returned.
67: .BP setsockopt
68: Options that could only be \fIset\fP in 4.2BSD (e.g. SO_DEBUG, SO_REUSEADDR)
69: can now be set or reset. To implement this change all options must now
70: supply an option value which specifies if the option is to be turned on or off.
71: The SO_LINGER option takes a structure as its option value, including both
72: a boolean and an interval.
73: New options have been added: to get or set the amount of buffering allocated
74: for the socket, to get the type of the socket, and to check on error status.
75: Options can be set in any protocol layer that supports them;
76: IP, TCP and SPP all use this mechanism.
77: .BP setpriority
78: The error returned on an attempt to change another user's priority
79: was changed from EACCES to EPERM.
80: .BP setreuid
81: Now sets the process \fIp_uid\fP to the new effective user ID instead
82: of the real ID for consistency with usage elsewhere.
83: This avoids problems with processes that are not able
84: to signal themselves.
85: .BP sigreturn
86: Is a new system call designed for restoring a process' context to a
87: previously saved one (see \fIsetjmp/longjmp\fP).
88: .BP sigvec
89: Three new signals have been added, SIGWINCH, SIGUSR1, and
90: SIGUSR2. The first is for notification of window size changes
91: and the other two have been reserved for users.
92: .BP socket
93: The usage of the (undocumented) SIOCSPGRP \fIioctl\fP has changed.
94: For consistency with \fIfcntl\fP, the argument is treated
95: as a process if positive and as a process group if negative.
96: Asynchronous I/O using SIGIO is now possible on sockets.
97: .BP swapon
98: The error returned for when requesting a device which was not
99: configured as a swap device was changed from ENODEV to EINVAL.
100: In addition, \fIswapon\fP now searches the swap device tables from
101: from the beginning instead of the second entry.
102: .BP unlink
103: If the ISVTX (sticky text) bit is set in the mode of a directory,
104: files may only be removed from that directory by the owner of the file,
105: the owner of the directory, or the superuser.
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