My st config.
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#include <sys/wait.h>
void
plumb(char *sel) {
if (sel == NULL)
return;
char cwd[PATH_MAX];
pid_t child;
if (subprocwd(cwd) != 0)
return;
switch(child = fork()) {
case -1:
return;
case 0:
if (chdir(cwd) != 0)
exit(1);
if (execvp(plumb_cmd, (char *const []){plumb_cmd, sel, 0}) == -1)
exit(1);
exit(0);
default:
waitpid(child, NULL, 0);
}
}