| 1 | # |
| 2 | /* |
| 3 | * UNIX shell |
| 4 | * |
| 5 | * S. R. Bourne |
| 6 | * Bell Telephone Laboratories |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include "defs.h" |
| 11 | #include "dup.h" |
| 12 | #include "sym.h" |
| 13 | #include "timeout.h" |
| 14 | #include <sys/types.h> |
| 15 | #include <sys/stat.h> |
| 16 | #include <sgtty.h> |
| 17 | |
| 18 | UFD output = 2; |
| 19 | LOCAL BOOL beenhere = FALSE; |
| 20 | CHAR tmpout[20] = "/tmp/sh-"; |
| 21 | FILEBLK stdfile; |
| 22 | FILE standin = &stdfile; |
| 23 | #include <execargs.h> |
| 24 | |
| 25 | PROC VOID exfile(); |
| 26 | |
| 27 | |
| 28 | |
| 29 | |
| 30 | main(c, v) |
| 31 | INT c; |
| 32 | STRING v[]; |
| 33 | { |
| 34 | REG INT rflag=ttyflg; |
| 35 | |
| 36 | /* initialise storage allocation */ |
| 37 | stdsigs(); |
| 38 | setbrk(BRKINCR); |
| 39 | addblok((POS)0); |
| 40 | |
| 41 | /* set names from userenv */ |
| 42 | getenv(); |
| 43 | |
| 44 | /* look for restricted */ |
| 45 | /* IF c>0 ANDF any('r', *v) THEN rflag=0 FI */ |
| 46 | |
| 47 | /* look for options */ |
| 48 | dolc=options(c,v); |
| 49 | IF dolc<2 THEN flags |= stdflg FI |
| 50 | IF (flags&stdflg)==0 |
| 51 | THEN dolc--; |
| 52 | FI |
| 53 | dolv=v+c-dolc; dolc--; |
| 54 | |
| 55 | /* return here for shell file execution */ |
| 56 | setjmp(subshell); |
| 57 | |
| 58 | /* number of positional parameters */ |
| 59 | assnum(&dolladr,dolc); |
| 60 | cmdadr=dolv[0]; |
| 61 | |
| 62 | /* set pidname */ |
| 63 | assnum(&pidadr, getpid()); |
| 64 | |
| 65 | /* set up temp file names */ |
| 66 | settmp(); |
| 67 | |
| 68 | /* default ifs */ |
| 69 | dfault(&ifsnod, sptbnl); |
| 70 | |
| 71 | IF (beenhere++)==FALSE |
| 72 | THEN /* ? profile */ |
| 73 | IF *cmdadr=='-' |
| 74 | ANDF (input=pathopen(nullstr, profile))>=0 |
| 75 | THEN exfile(rflag); flags &= ~ttyflg; |
| 76 | FI |
| 77 | IF rflag==0 THEN flags |= rshflg FI |
| 78 | |
| 79 | /* open input file if specified */ |
| 80 | IF comdiv |
| 81 | THEN estabf(comdiv); input = -1; |
| 82 | ELSE input=((flags&stdflg) ? 0 : chkopen(cmdadr)); |
| 83 | comdiv--; |
| 84 | FI |
| 85 | ELSE *execargs=dolv; /* for `ps' cmd */ |
| 86 | FI |
| 87 | |
| 88 | exfile(0); |
| 89 | done(); |
| 90 | } |
| 91 | |
| 92 | LOCAL VOID exfile(prof) |
| 93 | BOOL prof; |
| 94 | { |
| 95 | REG L_INT mailtime = 0; |
| 96 | REG INT userid; |
| 97 | struct stat statb; |
| 98 | |
| 99 | /* move input */ |
| 100 | IF input>0 |
| 101 | THEN Ldup(input,INIO); |
| 102 | input=INIO; |
| 103 | FI |
| 104 | |
| 105 | /* move output to safe place */ |
| 106 | IF output==2 |
| 107 | THEN Ldup(dup(2),OTIO); |
| 108 | output=OTIO; |
| 109 | FI |
| 110 | |
| 111 | userid=getuid(); |
| 112 | |
| 113 | /* decide whether interactive */ |
| 114 | IF (flags&intflg) ORF ((flags&oneflg)==0 ANDF gtty(output,&statb)==0 ANDF gtty(input,&statb)==0) |
| 115 | THEN dfault(&ps1nod, (userid?stdprompt:supprompt)); |
| 116 | dfault(&ps2nod, readmsg); |
| 117 | flags |= ttyflg|prompt; ignsig(KILL); |
| 118 | ELSE flags |= prof; flags &= ~prompt; |
| 119 | FI |
| 120 | |
| 121 | IF setjmp(errshell) ANDF prof |
| 122 | THEN close(input); return; |
| 123 | FI |
| 124 | |
| 125 | /* error return here */ |
| 126 | loopcnt=breakcnt=peekc=0; iopend=0; |
| 127 | IF input>=0 THEN initf(input) FI |
| 128 | |
| 129 | /* command loop */ |
| 130 | LOOP tdystak(0); |
| 131 | stakchk(); /* may reduce sbrk */ |
| 132 | exitset(); |
| 133 | IF (flags&prompt) ANDF standin->fstak==0 ANDF !eof |
| 134 | THEN IF mailnod.namval |
| 135 | ANDF stat(mailnod.namval,&statb)>=0 ANDF statb.st_size |
| 136 | ANDF (statb.st_mtime != mailtime) |
| 137 | ANDF mailtime |
| 138 | THEN prs(mailmsg) |
| 139 | FI |
| 140 | mailtime=statb.st_mtime; |
| 141 | prs(ps1nod.namval); |
| 142 | FI |
| 143 | |
| 144 | trapnote=0; peekc=readc(); |
| 145 | IF eof |
| 146 | THEN return; |
| 147 | FI |
| 148 | execute(cmd(NL,MTFLG),0); |
| 149 | eof |= (flags&oneflg); |
| 150 | POOL |
| 151 | } |
| 152 | |
| 153 | chkpr(eor) |
| 154 | char eor; |
| 155 | { |
| 156 | IF (flags&prompt) ANDF standin->fstak==0 ANDF eor==NL |
| 157 | THEN prs(ps2nod.namval); |
| 158 | FI |
| 159 | } |
| 160 | |
| 161 | settmp() |
| 162 | { |
| 163 | itos(getpid()); serial=0; |
| 164 | tmpnam=movstr(numbuf,&tmpout[TMPNAM]); |
| 165 | } |
| 166 | |
| 167 | Ldup(fa, fb) |
| 168 | REG INT fa, fb; |
| 169 | { |
| 170 | dup(fa|DUPFLG, fb); |
| 171 | close(fa); |
| 172 | ioctl(fb, FIOCLEX, 0); |
| 173 | } |