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39 * @(#)unistd.h 8.2 (Berkeley) 1/7/94
40 NetBSD: unistd.h,v 1.35 2006/08/14 18:17:48 rpaulo Exp
42 #ifndef _SYS_UNISTD_H_
43 #define _SYS_UNISTD_H_
45 #include <sys/featuretest.h>
47 /* compile-time symbolic constants */
50 * According to POSIX 1003.1:
51 * "The saved set-user-ID capability allows a program to regain the
52 * effective user ID established at the last exec call."
53 * However, the setuid/setgid function as specified by POSIX 1003.1 does
54 * not allow changing the effective ID from the super-user without also
55 * changed the saved ID, so it is impossible to get super-user privileges
56 * back later. Instead we provide this feature independent of the current
57 * effective ID through the seteuid/setegid function. In addition, we do
58 * not use the saved ID as specified by POSIX 1003.1 in setuid/setgid,
59 * because this would make it impossible for a set-user-ID executable
60 * owned by a user other than the super-user to permanently revoke its
64 #define _POSIX_SAVED_IDS /* saved set-user-ID and set-group-ID */
67 #define _POSIX_VERSION 199009L
68 #define _POSIX2_VERSION 199212L
70 /* execution-time symbolic constants */
72 #define _POSIX_TIMERS 200112L
74 /* Always ensure that these are consistent with <fcntl.h>!
75 whence values for lseek(2).
78 #define SEEK_SET 0 /**< set file offset to offset */
81 #define SEEK_CUR 1 /**< set file offset to current plus offset */
84 #define SEEK_END 2 /**< set file offset to EOF plus offset */
87 /* whence values for lseek(2); renamed by POSIX 1003.1 */
88 #define L_SET SEEK_SET
89 #define L_INCR SEEK_CUR
90 #define L_XTND SEEK_END
92 /* configurable system strings */
95 #endif /* !_SYS_UNISTD_H_ */