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
| #include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
int status;
int main(int argc, char *argv[])
{
char buffer[500];
memset(buffer,0,500);
if( argc == 2){
printf("argc =2 argv[1] = nom du fichier a traiter %s\n", argv[1]);
}
printf("\nDans MON SHELL écrire \"exit\" pour quitter\n");
while(1){
printf("MONSHELL > : ");
fgets(buffer,25,stdin);
int pid = fork();
if(pid == 0){
if (strstr(buffer,"exit") != NULL)
{
printf("PID : %d PPID : %d\n", getpid(), getppid());
exit(0);
}
if(strstr(buffer,"dir") != NULL)
{
execl("/bin/ls", "ls", "-l", NULL);
}
if(strstr(buffer,"ctr") != NULL)
{
execl("/usr/bin/clear", "clear", NULL);
}
if(strstr(buffer,"environ") != NULL)
{
execl("/usr/bin/env", "env", NULL);
}
if(strstr(buffer,"echo") !=NULL)
{
//char *argsexpr = "\\(.*\\).$";
//execl("/usr/bin/expr", "&buffer[5]", ":", "argsexpr", NULL);
//expr "bonjour" : "\(.*\).$"
//execl("/usr/bin/cut", "cut", "-f3-6", "&buffer[5]", NULL);
printf("%s\n", &buffer[5]);
}
else
{
printf("Commande inconnue ...\n");
}
}//fin if==0
int ret = waitpid(pid, &status, 0);
printf("ret = %d\n", ret);
if(ret == -1){
perror("echec waitpid du prc enfant 1");
}else{
printf("le execl() est termine prc = %d\n", getpid());
if (strstr(buffer,"exit") != NULL){
exit(0);
}
}
if(pid == -1)
{
perror("erreur fork -1");
exit(EXIT_FAILURE);
}
} //fin while
return EXIT_SUCCESS;
}//fin main |
