C language & UNIX
I have the following files:
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(SAMPLE) main_add.c
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#include
#include
#include
int result;
int main(int argc, char *argv[]){
printf(“main_add pid: %dn”, getpid());
int a = 0;
int b = 0;
a = atoi(argv[1]);
b = atoi(argv[2]);
result = a + b;
printf(“%d + %d = %dn”, a, b, result);
return 0;
}
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(SAMPLE) system_main_add_bootstrap.c
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#include
#include
#include
int main(void){
printf(“system_bootstrap pid: %dn”, getpid());
system(“./main_add 2 6”);
}
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(SAMPLE) exec_main_add_bootstrap.c
====================================================
#include
#include
#include
#include
int main(void){
printf(“system_bootstrap pid: %dn”, getpid());
int fd = open(“./main_add”, O_RDONLY);
printf(“fd of main_add: %dn”, fd);
char *newargv[] = {“./main_add”, “3”, “6”, NULL};
char *newenviron[] = {NULL};
int res = fexecve(fd, newargv, newenviron);
printf(“%dn”, res);
}
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system_math_bootstrap.c
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#include
#include
#include
int main(void){
printf(“system_bootstrap pid: %dn”, getpid());
char *program = “#include n”
“#include n”
“#include n”
“int result;n”
“int main(int argc, char *argv[]){n”
“printf(“main_add pid: %d\n””
