-
Notifications
You must be signed in to change notification settings - Fork 0
/
shell.c
277 lines (237 loc) · 5.44 KB
/
shell.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#define MAX_STRING_SIZE 256
#define MAX_PROG_NAME_SIZE 16
#define MAX_ARGS_SIZE 64
#define MAX_ARGS_NUM 16
#define MAX_PROG_NUM 20
struct program
{
char* name;
char** args;
};
int spawn_proc (int in, int out, struct program *cmd)
{
pid_t pid;
int ret = 0;
pid = fork();
if (pid == -1)
{
fprintf(stderr, "Can't fork\n");
fprintf(stderr, "%s\n", strerror(errno));
return -1;
}
if (pid == 0)
{
if (in != 0)
{
dup2 (in, 0);
close (in);
}
if (out != 1)
{
dup2 (out, 1);
close (out);
}
int exec_stat = execvp (cmd->name, cmd->args);
if ( exec_stat == -1)
{
fprintf(stderr, "Can't execute %s\n", cmd->name);
fprintf(stderr, "%s\n", strerror(errno));
exit(EXIT_FAILURE);
}
}
int wait_stat;
int ret_stat;
wait_stat = waitpid(pid, &ret_stat, WNOHANG);
if (wait_stat == -1)
{
fprintf(stderr, "Error in waitpid with process %s\n", cmd->name);
fprintf(stderr, "%s\n", strerror(errno));
return -1;
}
return 0;
}
int launch_prog(struct program** array_of_prog, int count)
{
int in, fd[2];
in = 0; // first process take input from stdin
int ret = 0;
int i;
for (i=0; i<count; i++)
{
ret = pipe(fd);
if (ret == -1)
{
fprintf(stderr, "Can't make pipe\n");
fprintf(stderr, "%s\n", strerror(errno));
return -1;
}
ret = spawn_proc(in, fd[1], array_of_prog[i]);
if (ret == -1)
{
goto out;
}
close(fd[1]);
in = fd[0];
}
char s[1];
int tmp = 0;
int size = 0;
tmp = read(fd[0], s, sizeof(char));
while (tmp > 0)
{
size+=tmp;
printf("%c", s[0]);
tmp = read(fd[0], s, sizeof(char));
if (tmp == -1)
{
fprintf(stderr,"Error in reading from pipe\n");
fprintf(stderr, "%s\n", strerror(errno));
goto out;
}
}
close(fd[0]);
printf("readed %d bytes\n", size);
return 0;
out:
close(fd[0]);
close(fd[1]);
return -1;
}
struct program* free_memory(struct program* prog)
{
if (prog == NULL)
{
return NULL;
}
if (prog->name != NULL)
{
free(prog->name);
prog->name = NULL;
}
if (prog->args != NULL)
{
int i;
for(i=0; i<MAX_ARGS_NUM; ++i)
{
if (prog->args[i] != NULL)
{
free(prog->args[i]);
prog->args[i] = NULL;
}
}
}
free(prog->args);
prog->args = NULL;
return NULL;
}
struct program* allocate_memory()
{
struct program* prog = NULL;
prog = malloc(sizeof(struct program));
if (prog == NULL)
{
fprintf(stderr,"Can't allocate memory for struct program\n");
goto allocate_out;
}
prog->name = NULL;
prog->name = malloc(MAX_PROG_NAME_SIZE*sizeof(char));
if (prog->name == NULL)
{
fprintf(stderr, "Can't allocate memory for prog_name\n");
goto allocate_out;
}
prog->args = NULL;
prog->args = malloc(MAX_ARGS_NUM*sizeof(char*));
if (prog->args == NULL)
{
fprintf(stderr, "Can't allocate memory for prog_args\n");
goto allocate_out;
}
int i;
for(i=0; i<MAX_ARGS_NUM; ++i)
{
prog->args[i] = NULL;
prog->args[i] = malloc(MAX_ARGS_SIZE*sizeof(char));
if (prog->args[i] == NULL)
{
fprintf(stderr, "Can't allocate memory for args[%d]\n", i);
goto allocate_out;
}
}
return prog;
allocate_out:
free_memory(prog);
return NULL;
}
struct program* parse(char* prog_line)
{
char* sep = " \n\t";
struct program* prog = allocate_memory();
if (prog == NULL)
{
return NULL;
}
char* buff = NULL;
buff = strtok(prog_line, sep);;
strcpy(prog->name, buff);
int j=0;
while (buff != NULL)
{
strcpy(prog->args[j], buff);
++j;
buff = strtok(NULL, sep);
}
prog->args[j] = NULL;
return prog;
}
int start_session()
{
printf("***********SHELL*************\n");
printf("**write down shell commands**\n\n");
char* line = NULL;
size_t size = 0;
int len;
len = getline(&line, &size, stdin);
if (len == -1)
{
fprintf(stderr, "Error in reading commands\n");
return -1;
}
line[len] = '\0';
char* sep = "|";
struct program* array[MAX_PROG_NUM];
char str_array[MAX_PROG_NUM][MAX_ARGS_SIZE];
int count = 0;
char* buf = strtok(line, sep);
while (buf != NULL)
{
strcpy(str_array[count], buf);
count++;
buf = strtok(NULL, sep);
}
int i;
for(i=0; i<count; i++)
{
array[i] = parse(str_array[i]);
}
launch_prog(array, count);
for(i=0; i<count; i++)
{
free_memory(array[i]);
}
}
int main(int argc, char** argv)
{
while(1)
{
start_session();
}
return 0;
}