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1 | /* $RCSfile: msdos.c,v $$Revision: 4.0.1.1 $$Date: 91/06/07 11:22:37 $ |
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2 | * |
3 | * (C) Copyright 1989, 1990 Diomidis Spinellis. |
4 | * |
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5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
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7 | * |
8 | * $Log: msdos.c,v $ |
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9 | * Revision 4.0.1.1 91/06/07 11:22:37 lwall |
10 | * patch4: new copyright notice |
11 | * |
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12 | * Revision 4.0 91/03/20 01:34:46 lwall |
13 | * 4.0 baseline. |
14 | * |
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15 | * Revision 3.0.1.1 90/03/27 16:10:41 lwall |
16 | * patch16: MSDOS support |
17 | * |
18 | * Revision 1.1 90/03/18 20:32:01 dds |
19 | * Initial revision |
20 | * |
21 | */ |
22 | |
23 | /* |
24 | * Various Unix compatibility functions for MS-DOS. |
25 | */ |
26 | |
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27 | #include "EXTERN.h" |
28 | #include "perl.h" |
29 | |
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30 | #include <dos.h> |
31 | #include <process.h> |
32 | |
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33 | /* |
34 | * Interface to the MS-DOS ioctl system call. |
35 | * The function is encoded as follows: |
36 | * The lowest nibble of the function code goes to AL |
37 | * The two middle nibbles go to CL |
38 | * The high nibble goes to CH |
39 | * |
40 | * The return code is -1 in the case of an error and if successful |
41 | * for functions AL = 00, 09, 0a the value of the register DX |
42 | * for functions AL = 02 - 08, 0e the value of the register AX |
43 | * for functions AL = 01, 0b - 0f the number 0 |
44 | * |
45 | * Notice that this restricts the ioctl subcodes stored in AL to 00-0f |
46 | * In the Ralf Borwn interrupt list 90.1 there are no subcodes above AL=0f |
47 | * so we are ok. |
48 | * Furthermore CH is also restriced in the same area. Where CH is used as a |
49 | * code it always is between 00-0f. In the case where it forms a count |
50 | * together with CL we arbitrarily set the highest count limit to 4095. It |
51 | * sounds reasonable for an ioctl. |
52 | * The other alternative would have been to use the pointer argument to |
53 | * point the the values of CX. The problem with this approach is that |
54 | * of accessing wild regions when DX is used as a number and not as a |
55 | * pointer. |
56 | */ |
57 | int |
58 | ioctl(int handle, unsigned int function, char *data) |
59 | { |
60 | union REGS srv; |
61 | struct SREGS segregs; |
62 | |
63 | srv.h.ah = 0x44; |
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64 | srv.h.al = (unsigned char)(function & 0x0F); |
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65 | srv.x.bx = handle; |
66 | srv.x.cx = function >> 4; |
67 | segread(&segregs); |
68 | #if ( defined(M_I86LM) || defined(M_I86CM) || defined(M_I86HM) ) |
69 | segregs.ds = FP_SEG(data); |
70 | srv.x.dx = FP_OFF(data); |
71 | #else |
72 | srv.x.dx = (unsigned int) data; |
73 | #endif |
74 | intdosx(&srv, &srv, &segregs); |
75 | if (srv.x.cflag & 1) { |
76 | switch(srv.x.ax ){ |
77 | case 1: |
78 | errno = EINVAL; |
79 | break; |
80 | case 2: |
81 | case 3: |
82 | errno = ENOENT; |
83 | break; |
84 | case 4: |
85 | errno = EMFILE; |
86 | break; |
87 | case 5: |
88 | errno = EPERM; |
89 | break; |
90 | case 6: |
91 | errno = EBADF; |
92 | break; |
93 | case 8: |
94 | errno = ENOMEM; |
95 | break; |
96 | case 0xc: |
97 | case 0xd: |
98 | case 0xf: |
99 | errno = EINVAL; |
100 | break; |
101 | case 0x11: |
102 | errno = EXDEV; |
103 | break; |
104 | case 0x12: |
105 | errno = ENFILE; |
106 | break; |
107 | default: |
108 | errno = EZERO; |
109 | break; |
110 | } |
111 | return -1; |
112 | } else { |
113 | switch (function & 0xf) { |
114 | case 0: case 9: case 0xa: |
115 | return srv.x.dx; |
116 | case 2: case 3: case 4: case 5: |
117 | case 6: case 7: case 8: case 0xe: |
118 | return srv.x.ax; |
119 | case 1: case 0xb: case 0xc: case 0xd: |
120 | case 0xf: |
121 | default: |
122 | return 0; |
123 | } |
124 | } |
125 | } |
126 | |
127 | |
128 | /* |
129 | * Sleep function. |
130 | */ |
131 | void |
132 | sleep(unsigned len) |
133 | { |
134 | time_t end; |
135 | |
136 | end = time((time_t *)0) + len; |
137 | while (time((time_t *)0) < end) |
138 | ; |
139 | } |
140 | |
141 | /* |
142 | * Just pretend that everyone is a superuser |
143 | */ |
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144 | #define ROOT_UID 0 |
145 | #define ROOT_GID 0 |
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146 | int |
147 | getuid(void) |
148 | { |
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149 | return ROOT_UID; |
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150 | } |
151 | |
152 | int |
153 | geteuid(void) |
154 | { |
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155 | return ROOT_UID; |
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156 | } |
157 | |
158 | int |
159 | getgid(void) |
160 | { |
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161 | return ROOT_GID; |
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162 | } |
163 | |
164 | int |
165 | getegid(void) |
166 | { |
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167 | return ROOT_GID; |
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168 | } |
169 | |
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170 | int |
171 | setuid(int uid) |
172 | { return (uid==ROOT_UID?0:-1); } |
173 | |
174 | int |
175 | setgid(int gid) |
176 | { return (gid==ROOT_GID?0:-1); } |
177 | |
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178 | /* |
179 | * The following code is based on the do_exec and do_aexec functions |
180 | * in file doio.c |
181 | */ |
182 | int |
183 | do_aspawn(really,arglast) |
184 | STR *really; |
185 | int *arglast; |
186 | { |
187 | register STR **st = stack->ary_array; |
188 | register int sp = arglast[1]; |
189 | register int items = arglast[2] - sp; |
190 | register char **a; |
191 | char **argv; |
192 | char *tmps; |
193 | int status; |
194 | |
195 | if (items) { |
196 | New(1101,argv, items+1, char*); |
197 | a = argv; |
198 | for (st += ++sp; items > 0; items--,st++) { |
199 | if (*st) |
200 | *a++ = str_get(*st); |
201 | else |
202 | *a++ = ""; |
203 | } |
204 | *a = Nullch; |
205 | if (really && *(tmps = str_get(really))) |
206 | status = spawnvp(P_WAIT,tmps,argv); |
207 | else |
208 | status = spawnvp(P_WAIT,argv[0],argv); |
209 | Safefree(argv); |
210 | } |
211 | return status; |
212 | } |
213 | |
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214 | |
215 | int |
216 | do_spawn(cmd) |
217 | char *cmd; |
218 | { |
219 | register char **a; |
220 | register char *s; |
221 | char **argv; |
222 | char flags[10]; |
223 | int status; |
224 | char *shell, *cmd2; |
225 | |
226 | /* save an extra exec if possible */ |
227 | if ((shell = getenv("COMSPEC")) == 0) |
228 | shell = "\\command.com"; |
229 | |
230 | /* see if there are shell metacharacters in it */ |
231 | if (strchr(cmd, '>') || strchr(cmd, '<') || strchr(cmd, '|')) |
232 | doshell: |
233 | return spawnl(P_WAIT,shell,shell,"/c",cmd,(char*)0); |
234 | |
235 | New(1102,argv, strlen(cmd) / 2 + 2, char*); |
236 | |
237 | New(1103,cmd2, strlen(cmd) + 1, char); |
238 | strcpy(cmd2, cmd); |
239 | a = argv; |
240 | for (s = cmd2; *s;) { |
241 | while (*s && isspace(*s)) s++; |
242 | if (*s) |
243 | *(a++) = s; |
244 | while (*s && !isspace(*s)) s++; |
245 | if (*s) |
246 | *s++ = '\0'; |
247 | } |
248 | *a = Nullch; |
249 | if (argv[0]) |
250 | if ((status = spawnvp(P_WAIT,argv[0],argv)) == -1) { |
251 | Safefree(argv); |
252 | Safefree(cmd2); |
253 | goto doshell; |
254 | } |
255 | Safefree(cmd2); |
256 | Safefree(argv); |
257 | return status; |
258 | } |