Question

I have read several forums but can’t find the solution to this.

int sIndex = 3;
char serverArgs[serverCommandCount + 3][20];


strcpy(serverArgs[0], "ant");
strcpy(serverArgs[1], "-f");
strcpy(serverArgs[2], "/dev/server1/trunk/build.xml");
if(serverStop){strcpy(serverArgs[sIndex], "jboss-stop"); sIndex++;}
if(serverClean){strcpy(serverArgs[sIndex], "clean"); sIndex++;}
if(serverDeploy){strcpy(serverArgs[sIndex], "deploy"); sIndex++;}
if(releaseDB){strcpy(serverArgs[sIndex], "releasedb"); sIndex++;}
if(createDB){strcpy(serverArgs[sIndex], "createdb"); sIndex++;}
if(serverStart){strcpy(serverArgs[sIndex], "jboss-start"); sIndex++;}
if(serverDebug){strcpy(serverArgs[sIndex], "jboss-start-debug"); sIndex++;}

execv(antEx, serverArgs);

In this solution the problem is the execv wanting a char *[ ] rather than a char[ ].

int sIndex = 3;
char *serverArgs[serverCommandCount + 3];

for(index = 0; index < serverCommandCount + 3; index++)
    serverArgs[index] = malloc(20);
strcpy(serverArgs[0], "ant");
strcpy(serverArgs[1], "-f");
strcpy(serverArgs[2], "/dev/server1/trunk/build.xml");
if(serverStop){strcpy(serverArgs[sIndex], "jboss-stop"); sIndex++;}
if(serverClean){strcpy(serverArgs[sIndex], "clean"); sIndex++;}
if(serverDeploy){strcpy(serverArgs[sIndex], "deploy"); sIndex++;}
if(releaseDB){strcpy(serverArgs[sIndex], "releasedb"); sIndex++;}
if(createDB){strcpy(serverArgs[sIndex], "createdb"); sIndex++;}
if(serverStart){strcpy(serverArgs[sIndex], "jboss-start"); sIndex++;}
if(serverDebug){strcpy(serverArgs[sIndex], "jboss-start-debug"); sIndex++;}

execv(antEx, serverArgs);

When I try it this way, I get a segmentation fault when it tries to execute

strcpy(serverArgs[1], "-f");

What am I missing?

Answer 1

Check the man page for execv:

The array of pointers must be terminated by a NULL pointer.