exec - Failed to Open source file while system call in C -


i trying create call system using custom parameters. think incorrectly malloc-ing size of final char*. instead failed open source file error during system call. doing wrong in terms of syntax?

#include <stdio.h> #include <stdlib.h> #include <string.h>  int main(void) {   char program_name[] = "/usr/local/bin/some_program";   char argument_1[] = "foo";   char argument_2[] = "foo2";   char space[] = " ";   char *runprogram = malloc( strlen(program_name) + strlen(argument_1)+                              strlen(argument_2) + 2*strlen(space) + 1);    strcpy(runprogram, program_name);   strcat(runprogram, space);   strcat(runprogram, argument_1);   strcat(runprogram, space);   strcat(runprogram, argument_2);    system(runprogram);   free(runprogram);   exit(0); }

when run code, string appears contain needs to called. have suggestion simplify building though:

... int ret=0; int len = strlen(program_name) + strlen(argument_1)+ strlen(argument_2) + 2*strlen(space) + 1; char *runprogram = malloc( len);  ret = snprintf(runprogram, len, "%s %s %s", program_name, argument_1, argument_2); if(ret < 0) {     //handle if truncation occurred (returns -1 truncation) } if(ret >= len) {     //use runprogram buffer } system(runprogram); free(runprogram); //exit(0); return 0; ...

have verified chmod settings on file executed correct?

chmod +x /usr/local/bin/some_program

edit:
address concern in comments regarding variations in implementation/documentation snprintf(). when discussing standard c functions, hope implementations of same function equal across platforms, snprintf(), appears implementations more equal others...
1) snprintf have referred microsoft's broken implementation.
2) snprintf skrenta.com
3) snprintf opengroup.org.
4) snprintf linux.die.net, (includes glibc references, macros , other comments)


Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

android - Keyboard hides my half of edit-text and button below it even in scroll view -

i having trouble keyboard covers edit-text , half of button in scroll view. here's layout , please tell me how should resolve problem. many questions on topic none of them s working me. <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@drawable/bg" android:layout_height="match_parent"> <scrollview android:layout_width="match_parent" android:fillviewport="true" android:layout_height="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="w...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more