Linux Certif

Toute la documentation sur la certification Linux LPI

execve

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#include <unistd.h>

int execve(const char *filename, char *const argv[],
char *const envp[]);

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int main(int argc, char *argv[], char *envp[]).

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/* myecho.c */



#include <stdio.h>

#include <stdlib.h>



int

main(int argc, char *argv[])

{

    int j;



    for (j = 0; j < argc; j++)

        printf("argv[%d]: %s\n", j, argv[j]);



    exit(EXIT_SUCCESS);

}

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/* execve.c */



#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <assert.h>



int

main(int argc, char *argv[])

{

    char *newargv[] = { NULL, "hello", "world", NULL };

    char *newenviron[] = { NULL };



    assert(argc == 2);  /* argv[1] identifies 

                           program to exec */

    newargv[0] = argv[1];



    execve(argv[1], newargv, newenviron);

    perror("execve");   /* execve() only returns on error */

    exit(EXIT_FAILURE);

}

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$ cc myecho.c -o myecho

$ cc execve.c -o execve

$ ./exceve ./myecho

argv[0]: ./myecho

argv[1]: hello

argv[2]: world

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$ cat > script.sh

#! ./myecho script-arg

^D

$ chmod +x script.sh

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$ ./execve ./script.sh

argv[0]: ./myecho

argv[1]: script-arg

argv[2]: ./script.sh

argv[3]: hello

argv[4]: world

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chmod(2), fork(2), ptrace(2), execl(3), fexecve(3), environ(7), path_resolution(7), ld.so(8).