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1 | /* $Header: msdos.c,v 4.0 91/03/20 01:34:46 lwall Locked $ |
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2 | * |
3 | * (C) Copyright 1989, 1990 Diomidis Spinellis. |
4 | * |
5 | * You may distribute under the terms of the GNU General Public License |
6 | * as specified in the README file that comes with the perl 3.0 kit. |
7 | * |
8 | * $Log: msdos.c,v $ |
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9 | * Revision 4.0 91/03/20 01:34:46 lwall |
10 | * 4.0 baseline. |
11 | * |
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12 | * Revision 3.0.1.1 90/03/27 16:10:41 lwall |
13 | * patch16: MSDOS support |
14 | * |
15 | * Revision 1.1 90/03/18 20:32:01 dds |
16 | * Initial revision |
17 | * |
18 | */ |
19 | |
20 | /* |
21 | * Various Unix compatibility functions for MS-DOS. |
22 | */ |
23 | |
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24 | #include "EXTERN.h" |
25 | #include "perl.h" |
26 | |
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27 | #include <dos.h> |
28 | #include <process.h> |
29 | |
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30 | /* |
31 | * Interface to the MS-DOS ioctl system call. |
32 | * The function is encoded as follows: |
33 | * The lowest nibble of the function code goes to AL |
34 | * The two middle nibbles go to CL |
35 | * The high nibble goes to CH |
36 | * |
37 | * The return code is -1 in the case of an error and if successful |
38 | * for functions AL = 00, 09, 0a the value of the register DX |
39 | * for functions AL = 02 - 08, 0e the value of the register AX |
40 | * for functions AL = 01, 0b - 0f the number 0 |
41 | * |
42 | * Notice that this restricts the ioctl subcodes stored in AL to 00-0f |
43 | * In the Ralf Borwn interrupt list 90.1 there are no subcodes above AL=0f |
44 | * so we are ok. |
45 | * Furthermore CH is also restriced in the same area. Where CH is used as a |
46 | * code it always is between 00-0f. In the case where it forms a count |
47 | * together with CL we arbitrarily set the highest count limit to 4095. It |
48 | * sounds reasonable for an ioctl. |
49 | * The other alternative would have been to use the pointer argument to |
50 | * point the the values of CX. The problem with this approach is that |
51 | * of accessing wild regions when DX is used as a number and not as a |
52 | * pointer. |
53 | */ |
54 | int |
55 | ioctl(int handle, unsigned int function, char *data) |
56 | { |
57 | union REGS srv; |
58 | struct SREGS segregs; |
59 | |
60 | srv.h.ah = 0x44; |
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61 | srv.h.al = (unsigned char)(function & 0x0F); |
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62 | srv.x.bx = handle; |
63 | srv.x.cx = function >> 4; |
64 | segread(&segregs); |
65 | #if ( defined(M_I86LM) || defined(M_I86CM) || defined(M_I86HM) ) |
66 | segregs.ds = FP_SEG(data); |
67 | srv.x.dx = FP_OFF(data); |
68 | #else |
69 | srv.x.dx = (unsigned int) data; |
70 | #endif |
71 | intdosx(&srv, &srv, &segregs); |
72 | if (srv.x.cflag & 1) { |
73 | switch(srv.x.ax ){ |
74 | case 1: |
75 | errno = EINVAL; |
76 | break; |
77 | case 2: |
78 | case 3: |
79 | errno = ENOENT; |
80 | break; |
81 | case 4: |
82 | errno = EMFILE; |
83 | break; |
84 | case 5: |
85 | errno = EPERM; |
86 | break; |
87 | case 6: |
88 | errno = EBADF; |
89 | break; |
90 | case 8: |
91 | errno = ENOMEM; |
92 | break; |
93 | case 0xc: |
94 | case 0xd: |
95 | case 0xf: |
96 | errno = EINVAL; |
97 | break; |
98 | case 0x11: |
99 | errno = EXDEV; |
100 | break; |
101 | case 0x12: |
102 | errno = ENFILE; |
103 | break; |
104 | default: |
105 | errno = EZERO; |
106 | break; |
107 | } |
108 | return -1; |
109 | } else { |
110 | switch (function & 0xf) { |
111 | case 0: case 9: case 0xa: |
112 | return srv.x.dx; |
113 | case 2: case 3: case 4: case 5: |
114 | case 6: case 7: case 8: case 0xe: |
115 | return srv.x.ax; |
116 | case 1: case 0xb: case 0xc: case 0xd: |
117 | case 0xf: |
118 | default: |
119 | return 0; |
120 | } |
121 | } |
122 | } |
123 | |
124 | |
125 | /* |
126 | * Sleep function. |
127 | */ |
128 | void |
129 | sleep(unsigned len) |
130 | { |
131 | time_t end; |
132 | |
133 | end = time((time_t *)0) + len; |
134 | while (time((time_t *)0) < end) |
135 | ; |
136 | } |
137 | |
138 | /* |
139 | * Just pretend that everyone is a superuser |
140 | */ |
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141 | #define ROOT_UID 0 |
142 | #define ROOT_GID 0 |
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143 | int |
144 | getuid(void) |
145 | { |
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146 | return ROOT_UID; |
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147 | } |
148 | |
149 | int |
150 | geteuid(void) |
151 | { |
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152 | return ROOT_UID; |
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153 | } |
154 | |
155 | int |
156 | getgid(void) |
157 | { |
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158 | return ROOT_GID; |
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159 | } |
160 | |
161 | int |
162 | getegid(void) |
163 | { |
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164 | return ROOT_GID; |
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165 | } |
166 | |
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167 | int |
168 | setuid(int uid) |
169 | { return (uid==ROOT_UID?0:-1); } |
170 | |
171 | int |
172 | setgid(int gid) |
173 | { return (gid==ROOT_GID?0:-1); } |
174 | |
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175 | /* |
176 | * The following code is based on the do_exec and do_aexec functions |
177 | * in file doio.c |
178 | */ |
179 | int |
180 | do_aspawn(really,arglast) |
181 | STR *really; |
182 | int *arglast; |
183 | { |
184 | register STR **st = stack->ary_array; |
185 | register int sp = arglast[1]; |
186 | register int items = arglast[2] - sp; |
187 | register char **a; |
188 | char **argv; |
189 | char *tmps; |
190 | int status; |
191 | |
192 | if (items) { |
193 | New(1101,argv, items+1, char*); |
194 | a = argv; |
195 | for (st += ++sp; items > 0; items--,st++) { |
196 | if (*st) |
197 | *a++ = str_get(*st); |
198 | else |
199 | *a++ = ""; |
200 | } |
201 | *a = Nullch; |
202 | if (really && *(tmps = str_get(really))) |
203 | status = spawnvp(P_WAIT,tmps,argv); |
204 | else |
205 | status = spawnvp(P_WAIT,argv[0],argv); |
206 | Safefree(argv); |
207 | } |
208 | return status; |
209 | } |
210 | |
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211 | |
212 | int |
213 | do_spawn(cmd) |
214 | char *cmd; |
215 | { |
216 | register char **a; |
217 | register char *s; |
218 | char **argv; |
219 | char flags[10]; |
220 | int status; |
221 | char *shell, *cmd2; |
222 | |
223 | /* save an extra exec if possible */ |
224 | if ((shell = getenv("COMSPEC")) == 0) |
225 | shell = "\\command.com"; |
226 | |
227 | /* see if there are shell metacharacters in it */ |
228 | if (strchr(cmd, '>') || strchr(cmd, '<') || strchr(cmd, '|')) |
229 | doshell: |
230 | return spawnl(P_WAIT,shell,shell,"/c",cmd,(char*)0); |
231 | |
232 | New(1102,argv, strlen(cmd) / 2 + 2, char*); |
233 | |
234 | New(1103,cmd2, strlen(cmd) + 1, char); |
235 | strcpy(cmd2, cmd); |
236 | a = argv; |
237 | for (s = cmd2; *s;) { |
238 | while (*s && isspace(*s)) s++; |
239 | if (*s) |
240 | *(a++) = s; |
241 | while (*s && !isspace(*s)) s++; |
242 | if (*s) |
243 | *s++ = '\0'; |
244 | } |
245 | *a = Nullch; |
246 | if (argv[0]) |
247 | if ((status = spawnvp(P_WAIT,argv[0],argv)) == -1) { |
248 | Safefree(argv); |
249 | Safefree(cmd2); |
250 | goto doshell; |
251 | } |
252 | Safefree(cmd2); |
253 | Safefree(argv); |
254 | return status; |
255 | } |