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/******************************
* pdl.c - perldl spawner
* Works around a problem with many unices that you can't use an interpreter
* to run an interpreter -- so "#!/usr/bin/perldl" won't work.
* This is a compiled piece of code that launches perldl "directly",
* so that the poor kernel's mind isn't blown.
*
* If you feed in a single non-switch argument it gets prepended with a
* "-" to let perldl know that it's an input file. That way you can be lazy
* and say "#!/usr/bin/pdl" at the top of your script.
*
* CED 21-Jul-2004
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
int main(int argc, char **argv) {
char perldl[BUFSIZ];
int pipes[2];
int pid,i;
int status;
if(pipe(pipes)) {perror("pdl (perldl spawn wrapper)"); exit(1);}
pid = fork();
if(pid==0) {
dup2(pipes[1],1);
dup2(pipes[1],2);
exit(system("which perldl"));
}
pid = wait(&status);
if(! WIFEXITED(status) ) {
fprintf(stderr,"Hmmm... couldn't seem to find perldl anywhere. Quitting.\n");
goto exit;
}
if( read(pipes[0],perldl,BUFSIZ) <= 0 ) {
fprintf(stderr, "Read error - quitting.\n");
goto exit;
}
/* Remove trailing newline */
for(i=0;i<BUFSIZ && perldl[i]; i++)
if(perldl[i]=='\n' || perldl[i]=='\r')
perldl[i]='\0';
if(argc==2) {
if(argv[1][0]!='-') {
char **argv2 = malloc((argc+2)*sizeof(char *));
int i;
if(!argv2)
goto exit;
for(i=0;i<argc;i++)
argv2[i+1]=argv[i];
argv2[1]="-";
argv2[0]="perldl";
argv2[argc+1]=0;
execv(perldl,argv2);
fprintf(stderr,"couldn't execv %s\n",perldl);
goto exit;
}
}
argv[0]="perldl";
execv(perldl,argv);
fprintf(stderr,"couldn't execv %s (%d args)\n",perldl,argc);
goto exit;
exit:
perror("pdl (perldl trampoline)");
exit(-1);
}
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