The Linux Programming Interface

1504 INDEX

UNIX 95, 13, 17

UNIX 98, 13, 17

UNIX International, 13

UNIX System Laboratories, 8

unix_sockets.c, 1435

unix_sockets.h, 1435

unlink(), 109, 286, 300, 345, 346, 426, 800,

1145, 1146

example of use, 347

prototype, 346

unlinkat(), 365, 426

unlockpt(), 1380, 1382

example of use, 1384

prototype, 1382

unnamed semaphore. See POSIX

semaphore, unnamed

unprivileged process, 33

UNSAFE comment inside signal

handler, 428

unset shell command, 125

unsetenv C shell command, 125

unsetenv(), 129, 657, 1426

example of use, 131

prototype, 129

unshare(), 603, 801

unspecified (in standard description), 15

updwtmpx(), 827

example of use, 829

prototype, 827

URG control bit, TCP, 1267, 1283

urgent data (socket), 394, 396, 1267, 1268,

1283, 1439

urgent mode (TCP), 1283

us_abstract_bind.c, 1176

us_xfr.h, 1167

us_xfr_cl.c, 1169

us_xfr_sv.c, 1168

us_xfr_v2_cl.c, 1435

us_xfr_v2_sv.c, 1435

usageErr(), 53–54

code of implementation, 56

prototype, 54

usageError(), 54

uselib(), 345

user authentication, 162–166

user CPU time, 40, 206

User Datagram Protocol. See UDP

user ID, 26, 153

user mode, 23, 44

user space, 23

user stack, 122

USER_HZ constant, 207

USER_PROCESS constant, 820, 821, 822, 825

userIdFromName(), 159

code of implementation, 159–160

User-Mode Linux (UML), 789

username, 154

userNameFromId(), 159

code of implementation, 159

user-uninitialized data segment, 116

USL (UNIX System Laboratories), 8

usleep(), 673, 674

UT_HOSTSIZE constant, 830

UT_NAMESIZE constant, 830

utimbuf structure, 287

definition, 287

example of use, 288

utime(), 285, 286, 287–288, 345, 426, 800

prototype, 287

UTIME_NOW constant, 290

UTIME_OMIT constant, 290

utimensat(), 15, 286, 289–290, 365, 426

prototype, 289

utimes(), 286, 345, 288, 426

prototype, 288

utmp file, 817

example of use, 828

retrieving information from, 821

updating, 825

UTMP_FILE constant, 818

utmpx structure, 819–820, 822, 825,

826, 827

definition, 819

example of use, 824, 829

utmpx_login.c, 828

utmpxname(), 823

example of use, 824

prototype, 823

utsname structure, 229

definition, 229

example of use, 230

V

Vahalia (1996), 24, 138, 250, 278, 342,

630, 919, 1044, 1422, 1444

Vahalia, U., 1444

van der Linden (1994), xxxii, 1444

van der Linden, P., 1444

vanilla kernel, 234

Vargas, B.L., xxxix, xli

Vargas, C.E.K., xli

variadic function, 1413

Vaughan (2000), 857, 1444

Vaughan, G.V., 1444

VDISCARD constant, 1296

VEOF constant, 1296, 1309