# 2.11BSD#431 - /usr/src/bin/tcsh/tc.os.h

##### Macros

    BUFSIZ            X
    CSUSP             X
    F_OK              X
    L_INCR            X
    L_SET             X
    L_XTND            X
    NEEDgethostname   X
    NEEDgetwd         X
    NEEDtcgetpgrp     X
    NOFILE            X
    O_RDONLY          X
    O_RDWR            X
    O_WRONLY          X
    R_OK              X
    S_IEXEC           X
    S_IFBLK           X
    S_IFCHR           X
    S_IFDIR           X
    S_IFIFO           X
    S_IFMT            X
    S_IFNAM           X
    S_IFREG           X
    S_ISBLK           X
    S_ISCHR           X
    S_ISDIR           X
    S_ISFIFO          X
    S_ISLNK           X
    S_ISNAM           X
    S_ISREG           X
    S_ISSOCK          X
    S_IXGRP           X
    S_IXOTH           X
    S_IXUSR           X
    W_OK              X
    X_OK              X
    _h_tc_os          X
    calloc            X
    free              X
    getpgrp           X
    getrlimit         X
    lstat             X
    malloc            X
    mygetpgrp         X
    realloc           X
    setpgid           X
    setpgrp           X
    setrlimit         X
    tcsetpgrp         X

##### struct's

    ucred             X

##### typedef's

    tmval_t           X

       1: /* $Header: /home/hyperion/mu/christos/src/sys/tcsh-6.00/RCS/tc.os.h,v 3.1 1991/07/05 19:07:33 christos Exp $ */
       2: /*
       3:  * tc.os.h: Shell os dependent defines
       4:  */
       5: /*-
       6:  * Copyright (c) 1980, 1991 The Regents of the University of California.
       7:  * All rights reserved.
       8:  *
       9:  * Redistribution and use in source and binary forms, with or without
      10:  * modification, are permitted provided that the following conditions
      11:  * are met:
      12:  * 1. Redistributions of source code must retain the above copyright
      13:  *    notice, this list of conditions and the following disclaimer.
      14:  * 2. Redistributions in binary form must reproduce the above copyright
      15:  *    notice, this list of conditions and the following disclaimer in the
      16:  *    documentation and/or other materials provided with the distribution.
      17:  * 3. All advertising materials mentioning features or use of this software
      18:  *    must display the following acknowledgement:
      19:  *	This product includes software developed by the University of
      20:  *	California, Berkeley and its contributors.
      21:  * 4. Neither the name of the University nor the names of its contributors
      22:  *    may be used to endorse or promote products derived from this software
      23:  *    without specific prior written permission.
      24:  *
      25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
      26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
      29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      35:  * SUCH DAMAGE.
      36:  */
      37: #ifndef _h_tc_os
      38: #define _h_tc_os
      39:
      40: #ifdef OREO
      41: #include <sys/time.h>
      42: #include <sys/resource.h>
      43: #endif /* OREO */
      44:
      45: #ifdef titan
      46: extern int end;
      47: #endif /* titan */
      48:
      49: #ifdef hpux
      50: # ifdef lint
      51: /*
      52:  * Hpux defines struct ucred, in <sys/user.h>, but if I include that
      53:  * then I need to include the *world*
      54:  * [all this to pass lint cleanly!!!]
      55:  * so I define struct ucred here...
      56:  */
      57: struct ucred {
      58:     int     foo;
      59: };
      60: # endif /* lint */
      61:
      62: /*
      63:  * hpux 7.0 does not define it
      64:  */
      65: # ifndef CSUSP
      66: #  define CSUSP 032
      67: # endif	/* CSUSP */
      68:
      69: # include <sys/bsdtty.h>
      70:
      71: # ifndef POSIX
      72: #  ifdef BSDJOBS
      73: #   define getpgrp(a) getpgrp2(a)
      74: #   define setpgrp(a, b) setpgrp2(a, b)
      75: #  endif /* BSDJOBS */
      76: # endif	/* POSIX */
      77: #endif /* hpux */
      78:
      79: #ifdef HYPERCUBE
      80: /*
      81:  * for struct winsiz
      82:  */
      83: # include <sys/stream.h>
      84: # include <sys/ptem.h>
      85: # define NEEDgethostname
      86: #endif /* HYPERCUBE */
      87:
      88: #ifdef IRIS4D
      89: # include <sys/time.h>
      90: # include <sys/resource.h>
      91: /*
      92:  * BSDsetpgrp() and BSDgetpgrp() are BSD versions of setpgrp, etc.
      93:  */
      94: # define setpgrp BSDsetpgrp
      95: # define getpgrp BSDgetpgrp
      96: #endif /* IRIS4D */
      97:
      98: /*
      99:  * Stat
     100:  */
     101: #ifdef ISC
     102: /* these are not defined for _POSIX_SOURCE under ISC 2.2 */
     103: # ifndef S_IFMT
     104: #  define S_IFMT  0170000       /* type of file */
     105: #  define S_IFDIR 0040000       /* directory */
     106: #  define S_IFCHR 0020000       /* character special */
     107: #  define S_IFBLK 0060000       /* block special */
     108: #  define S_IFREG 0100000       /* regular */
     109: #  define S_IFIFO 0010000       /* fifo */
     110: #  define S_IFNAM 0050000       /* special named file */
     111: # endif /* S_IFMT */
     112: #endif /* ISC */
     113:
     114: #ifdef S_IFMT
     115: # if !defined(S_ISDIR) && defined(S_IFDIR)
     116: #  define S_ISDIR(a)    (((a) & S_IFMT) == S_IFDIR)
     117: # endif	/* ! S_ISDIR && S_IFDIR */
     118: # if !defined(S_ISCHR) && defined(S_IFCHR)
     119: #  define S_ISCHR(a)    (((a) & S_IFMT) == S_IFCHR)
     120: # endif /* ! S_ISCHR && S_IFCHR */
     121: # if !defined(S_ISBLK) && defined(S_IFBLK)
     122: #  define S_ISBLK(a)    (((a) & S_IFMT) == S_IFBLK)
     123: # endif	/* ! S_ISBLK && S_IFBLK */
     124: # if !defined(S_ISREG) && defined(S_IFREG)
     125: #  define S_ISREG(a)    (((a) & S_IFMT) == S_IFREG)
     126: # endif	/* ! S_ISREG && S_IFREG */
     127: # if !defined(S_ISFIFO) && defined(S_IFIFO)
     128: #  define S_ISFIFO(a)   (((a) & S_IFMT) == S_IFIFO)
     129: # endif	/* ! S_ISFIFO && S_IFIFO */
     130: # if !defined(S_ISNAM) && defined(S_IFNAM)
     131: #  define S_ISNAM(a)    (((a) & S_IFMT) == S_IFNAM)
     132: # endif	/* ! S_ISNAM && S_IFNAM */
     133: # if !defined(S_ISNAM) && defined(S_IFNAM)
     134: #  define S_ISNAM(a)    (((a) & S_IFMT) == S_IFNAM)
     135: # endif	/* ! S_ISNAM && S_IFNAM */
     136: # if !defined(S_ISLNK) && defined(S_IFLNK)
     137: #  define S_ISLNK(a)    (((a) & S_IFMT) == S_IFLNK)
     138: # endif	/* ! S_ISLNK && S_IFLNK */
     139: # if !defined(S_ISSOCK) && defined(S_IFSOCK)
     140: #  define S_ISSOCK(a)   (((a) & S_IFMT) == S_IFSOCK)
     141: # endif	/* ! S_ISSOCK && S_IFSOCK */
     142: #endif /* S_IFMT */
     143:
     144: #ifndef S_IEXEC
     145: # define S_IEXEC 0000100
     146: #endif /* S_IEXEC */
     147: #ifndef S_IXOTH
     148: # define S_IXOTH (S_IEXEC >> 6)
     149: #endif /* S_IXOTH */
     150: #ifndef S_IXGRP
     151: # define S_IXGRP (S_IEXEC >> 3)
     152: #endif /* S_IXGRP */
     153: #ifndef S_IXUSR
     154: # define S_IXUSR S_IEXEC
     155: #endif /* S_IXUSR */
     156:
     157: /*
     158:  * Access()
     159:  */
     160: #ifndef F_OK
     161: # define F_OK 0
     162: #endif /* F_OK */
     163: #ifndef X_OK
     164: # define X_OK 1
     165: #endif /* X_OK */
     166: #ifndef W_OK
     167: # define W_OK 2
     168: #endif /* W_OK */
     169: #ifndef R_OK
     170: # define R_OK 4
     171: #endif /* R_OK */
     172:
     173: /*
     174:  * Open()
     175:  */
     176: #ifndef O_RDONLY
     177: # define O_RDONLY   0
     178: #endif /* O_RDONLY */
     179: #ifndef O_WRONLY
     180: # define O_WRONLY   1
     181: #endif /* O_WRONLY */
     182: #ifndef O_RDWR
     183: # define O_RDWR     2
     184: #endif /* O_RDWR */
     185:
     186: /*
     187:  * Lseek()
     188:  */
     189: #ifndef L_SET
     190: # ifdef SEEK_SET
     191: #  define L_SET     SEEK_SET
     192: # else
     193: #  define L_SET     0
     194: # endif	/* SEEK_SET */
     195: #endif /* L_SET */
     196: #ifndef L_INCR
     197: # ifdef SEEK_CUR
     198: #  define L_INCR    SEEK_CUR
     199: # else
     200: #  define L_INCR    1
     201: # endif	/* SEEK_CUR */
     202: #endif /* L_INCR */
     203: #ifndef L_XTND
     204: # ifdef SEEK_END
     205: #  define L_XTND    SEEK_END
     206: # else
     207: #  define L_XTND    2
     208: # endif /* SEEK_END */
     209: #endif /* L_XTND */
     210:
     211: #ifdef _SEQUENT_
     212: # define NEEDgethostname
     213: #endif /* _SEQUENT_ */
     214:
     215: #if defined(BSD) && defined(POSIXJOBS)
     216: # define setpgid(pid, pgrp) setpgrp(pid, pgrp)
     217: #endif /* BSD && POSIXJOBS */
     218:
     219: #if defined(BSDJOBS) && !(defined(POSIX) && defined(POSIXJOBS))
     220: # if !defined(_AIX370) && !defined(_AIXPS2)
     221: #  define setpgid(pid, pgrp)    setpgrp(pid, pgrp)
     222: # endif /* !_AIX370 && !_AIXPS2 */
     223: # define tcsetpgrp(fd, pgrp)    ioctl((fd), TIOCSPGRP, (ioctl_t) &(pgrp))
     224: # define NEEDtcgetpgrp
     225: #endif /* BSDJOBS && !(POSIX && POSIXJOBS) */
     226:
     227: #ifdef RENO
     228: /*
     229:  * Older versions of RENO had this broken. It is fixed now.
     230:  * In any case, we use ours...
     231:  */
     232: # define tcsetpgrp(fd, pgrp)    ioctl((fd), TIOCSPGRP, (ioctl_t) &(pgrp))
     233: # define NEEDtcgetpgrp
     234: #endif /* RENO */
     235:
     236: #ifdef DGUX
     237: # define setpgrp(a, b) setpgrp2(a, b)
     238: # define getpgrp(a) getpgrp2(a)
     239: #endif /* DGUX */
     240:
     241: #ifdef SXA
     242: # ifndef BSDNICE
     243: /*
     244:  * We check BSDNICE cause this is not defined in config.sxa.
     245:  * Only needed in the system V environment.
     246:  */
     247: #  define setrlimit(a, b)   b_setrlimit(a, b)
     248: #  define getrlimit(a, b)   b_getrlimit(a, b)
     249: # endif	/* BSDNICE */
     250: # ifndef NOFILE
     251: #  define   NOFILE  64
     252: # endif	/* NOFILE */
     253: #endif /* SXA */
     254:
     255: #ifndef POSIX
     256: # define mygetpgrp()    getpgrp(0)
     257: #else /* POSIX */
     258: # if defined(BSD) || defined(sun)
     259: #  define mygetpgrp()    getpgrp(0)
     260: # else /* BSD || sun */
     261: #  define mygetpgrp()    getpgrp()
     262: # endif	/* BSD || sun */
     263: #endif /* POSIX */
     264:
     265:
     266: #if SVID > 0 && !defined(OREO) && !defined(IRIS4D)
     267: # define NEEDgetwd
     268: #endif /* SVID > 0 && !OREO && !IRIS4D */
     269:
     270: #ifndef S_IFLNK
     271: # define lstat stat
     272: #endif /* S_IFLNK */
     273:
     274:
     275: #if defined(BSDTIMES) && !defined(_SEQUENT_)
     276: typedef struct timeval tmval_t;
     277: #endif /* BSDTIMES && ! _SEQUENT_ */
     278:
     279: #ifdef NeXT
     280: /*
     281:  * From Tony_Mason@transarc.com, override NeXT's malloc stuff.
     282:  */
     283: # define malloc tcsh_malloc
     284: # define calloc tcsh_calloc
     285: # define realloc tcsh_realloc
     286: # define free tcsh_free
     287: #endif /* NeXT */
     288:
     289:
     290: #if !defined(POSIX) || defined(sun)
     291: extern time_t time();
     292: extern char *getenv();
     293: extern int atoi();
     294: extern char *ttyname();
     295:
     296: # ifndef hpux
     297: extern int abort();
     298: extern int qsort();
     299: # else
     300: extern void abort();
     301: extern void qsort();
     302: # endif
     303: extern void perror();
     304:
     305: # ifndef NEEDgethostname
     306: extern int gethostname();
     307: # endif
     308:
     309: # ifdef pdp11
     310: #  ifdef BUFSIZ
     311: #   undef BUFSIZ
     312: #  endif
     313: #  define BUFSIZ 512
     314: # endif
     315:
     316: # ifdef BSDSIGS
     317: #  if defined(_AIX370) || defined(MACH) || defined(NeXT) || defined(_AIXPS2)
     318: extern int sigvec();
     319: extern int sigpause();
     320: #  else /* _AIX370 || MACH || NeXT || _AIXPS2 */
     321: extern sigret_t sigvec();
     322: extern void sigpause();
     323: #  endif /* _AIX370 || MACH || NeXT || _AIXPS2 */
     324: #  ifndef pdp11
     325: extern sigmask_t sigblock();
     326: extern sigmask_t sigsetmask();
     327: #  else
     328: /* #define sigmask_t sigm_t in compat.h to avoid 7-char conflict with sigmask */
     329: extern sigmask_t sigblock();
     330: extern sigmask_t sigsetmask();
     331: #  endif /* pdp11 */
     332: # endif	/* BSDSIGS */
     333:
     334: # ifndef killpg
     335: extern int killpg();
     336: # endif	/* killpg */
     337:
     338: # ifndef lstat
     339: extern int lstat();
     340: # endif	/* lstat */
     341:
     342: # ifdef SYSMALLOC
     343: extern memalign_t malloc();
     344: extern memalign_t realloc();
     345: extern memalign_t calloc();
     346: extern void free();
     347: # endif	/* SYSMALLOC */
     348:
     349: # ifdef BSDTIMES
     350: extern int getrlimit();
     351: extern int setrlimit();
     352: extern int getrusage();
     353: extern int gettimeofday();
     354: # endif	/* BSDTIMES */
     355:
     356: # if defined(NLS) && !defined(NOSTRCOLL) && !defined(NeXT)
     357: extern int strcoll();
     358: # endif
     359:
     360: # ifdef BSDJOBS
     361: #  ifdef BSDTIMES
     362: extern int wait3();
     363: #  else /* ! BSDTIMES */
     364: #   if !defined(POSIXJOBS) && !defined(_SEQUENT_)
     365: extern int wait3();
     366: #   else /* POSIXJOBS || _SEQUENT_ */
     367: extern int waitpid();
     368: #   endif /* POSIXJOBS || _SEQUENT_ */
     369: #  endif /* ! BSDTIMES */
     370: # else /* !BSDJOBS */
     371: #  if SVID < 3
     372: extern int ourwait();
     373: #  else /* SVID >= 3 */
     374: extern int wait();
     375: #  endif /* SVID >= 3 */
     376: # endif	/* ! BSDJOBS */
     377:
     378: # ifdef BSDNICE
     379: extern int setpriority();
     380: # else /* !BSDNICE */
     381: extern int nice();
     382: # endif	/* !BSDNICE */
     383:
     384: #ifdef pdp11
     385: extern int setpwent();
     386: #else
     387: extern void setpwent();
     388: #endif
     389: extern void endpwent();
     390: extern struct passwd *getpwuid(), *getpwnam(), *getpwent();
     391:
     392: # ifndef getwd
     393: extern char *getwd();
     394: # endif	/* getwd */
     395: #else /* POSIX */
     396:
     397: # if defined(sun) && !defined(__GNUC__)
     398: extern char *getwd();
     399: # endif	/* sun && ! __GNUC__ */
     400:
     401: # ifdef RENO
     402: extern void perror();       /* Reno declares that in stdio.h :-( */
     403: # endif	/* RENO */
     404: #endif /* POSIX */
     405:
     406: #endif /* _h_tc_os */

#### Defined struct's

ucred defined in line 57; never used

#### Defined typedef's

tmval_t defined in line 276; used 14 times

- in /usr/src/bin/tcsh/sh.h line 345
- in /usr/src/bin/tcsh/sh.proc.c line 181, 1144-1145(2)
- in /usr/src/bin/tcsh/sh.time.c line 68(2), 105, 115, 254, 261, 565-567(2), 575, 586

#### Defined macros

BUFSIZ defined in line 313; used 3 times

- in line 310-311(2)
- in /usr/src/bin/tcsh/sh.h line 82

CSUSP defined in line 66; used 1 times

- in line 65

F_OK defined in line 161; used 1 times

- in line 160

L_INCR defined in line 200; used 1 times

- in line 196

L_SET defined in line 193; used 1 times

- in line 189

L_XTND defined in line 207; used 1 times

- in line 203

NEEDgethostname defined in line 212; used 2 times

- in line 305
- in /usr/src/bin/tcsh/tc.os.c line 704

NEEDgetwd defined in line 267; used 1 times

- in /usr/src/bin/tcsh/tc.os.c line 733

NEEDtcgetpgrp defined in line 233; used 1 times

- in /usr/src/bin/tcsh/tc.os.c line 635

NOFILE defined in line 251; used 1 times

- in line 250

O_RDONLY defined in line 177; used 3 times

- in line 176
- in /usr/src/bin/tcsh/jpnerror.c line 25
- in /usr/src/bin/tcsh/sh.h line 193

O_RDWR defined in line 183; used 1 times

- in line 182

O_WRONLY defined in line 180; used 1 times

- in line 179

R_OK defined in line 170; used 1 times

- in line 169

S_IEXEC defined in line 145; used 4 times

- in line 144-154(4)

S_IFBLK defined in line 107; used 2 times

- in line 121-122(2)

S_IFCHR defined in line 106; used 2 times

- in line 118-119(2)

S_IFDIR defined in line 105; used 3 times

- in line 115-116(2)
- in /usr/src/bin/tcsh/glob.c line 80

S_IFIFO defined in line 109; used 2 times

- in line 127-128(2)

S_IFMT defined in line 104; used 13 times

- in line 103, 114-140(10)
- in /usr/src/bin/tcsh/glob.c line 80-84(2)

S_IFNAM defined in line 110; used 4 times

- in line 130-134(4)

S_IFREG defined in line 108; used 2 times

- in line 124-125(2)

S_ISBLK defined in line 122; used 1 times

- in line 121

S_ISCHR defined in line 119; used 1 times

- in line 118

S_ISDIR defined in line 116; used 6 times

- in line 115
- in /usr/src/bin/tcsh/glob.c line 79, 186, 212, 451-455(2)

S_ISFIFO defined in line 128; used 7 times

- in line 127
- in /usr/src/bin/tcsh/sh.exp.c line 546-547(2)
- in /usr/src/bin/tcsh/tw.parse.c line 1266-1267(2), 1311-1312(2)

S_ISLNK defined in line 137; used 8 times

- in line 136
- in /usr/src/bin/tcsh/glob.c line 83-87(2), 453
- in /usr/src/bin/tcsh/sh.exp.c line 554-555(2)
- in /usr/src/bin/tcsh/tw.parse.c line 1248-1249(2)

S_ISNAM defined in line 134; used 2 times

- in line 130-133(2)

S_ISREG defined in line 125; used 1 times

- in line 124

S_ISSOCK defined in line 140; used 7 times

- in line 139
- in /usr/src/bin/tcsh/sh.exp.c line 562-563(2)
- in /usr/src/bin/tcsh/tw.parse.c line 1262-1263(2), 1307-1308(2)

S_IXGRP defined in line 151; used 1 times

- in line 150

S_IXOTH defined in line 148; used 1 times

- in line 147

S_IXUSR defined in line 154; used 1 times

- in line 153

W_OK defined in line 167; used 1 times

- in line 166

X_OK defined in line 164; used 1 times

- in line 163

_h_tc_os defined in line 38; used 1 times

- in line 37

calloc defined in line 284; used 3 times

- in line 345
- in /usr/src/bin/tcsh/sh.h line 171, 255

free defined in line 286; used 5 times

- in line 346
- in /usr/src/bin/tcsh/sh.h line 170, 256
- in /usr/src/bin/tcsh/tc.alloc.c line 426, 538

getpgrp defined in line 238; used 5 times

- in line 256-261(3)
- in /usr/src/bin/tcsh/sh.h line 153-155(2)

getrlimit defined in line 248; used 3 times

- in line 350
- in /usr/src/bin/tcsh/sh.func.c line 1502, 1563

lstat defined in line 271; used 11 times

- in line 338-339(2)
- in /usr/src/bin/tcsh/glob.c line 87, 183, 189, 209
- in /usr/src/bin/tcsh/sh.exp.c line 529
- in /usr/src/bin/tcsh/sh.file.c line 260
- in /usr/src/bin/tcsh/tc.os.c line 764, 794
- in /usr/src/bin/tcsh/tw.parse.c line 1245

malloc defined in line 283; used 13 times

- in line 343
- in /usr/src/bin/tcsh/glob.c line 566, 579, 613, 635, 670
- in /usr/src/bin/tcsh/sh.h line 169, 253
- in /usr/src/bin/tcsh/tc.alloc.c line 396, 421, 488, 503, 519

mygetpgrp defined in line 261; used 2 times

- in /usr/src/bin/tcsh/sh.c line 659, 734

realloc defined in line 285; used 5 times

- in line 344
- in /usr/src/bin/tcsh/glob.c line 565
- in /usr/src/bin/tcsh/sh.h line 172, 254
- in /usr/src/bin/tcsh/tc.alloc.c line 503

setpgid defined in line 221; used 8 times

- in /usr/src/bin/tcsh/sh.c line 718, 735, 747, 908
- in /usr/src/bin/tcsh/sh.func.c line 1621
- in /usr/src/bin/tcsh/sh.proc.c line 1752, 1832, 1843

setpgrp defined in line 237; used 4 times

- in line 216-221(2)
- in /usr/src/bin/tcsh/sh.h line 154-156(2)

setrlimit defined in line 247; used 2 times

- in line 351
- in /usr/src/bin/tcsh/sh.func.c line 1572

tcsetpgrp defined in line 232; used 9 times

- in /usr/src/bin/tcsh/sh.c line 708, 722, 909
- in /usr/src/bin/tcsh/sh.err.c line 469
- in /usr/src/bin/tcsh/sh.func.c line 1622
- in /usr/src/bin/tcsh/sh.lex.c line 1373
- in /usr/src/bin/tcsh/sh.proc.c line 575, 1507, 1839

#### Usage of this include

tc.os.h used 1 times

- in /usr/src/bin/tcsh/tc.h line 41

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