px_ipc_name.c

     /* include px_ipc_name */
 #include    "unpipc.h"

 char *
 px_ipc_name(const char *name)
 {

     char    *dir, *dst, *slash;

     if ( (dst = malloc(PATH_MAX)) == NULL)
         return(NULL);

         /* 4can override default directory with environment variable */
     if ( (dir = getenv("PX_IPC_NAME")) == NULL) {

 #ifdef  POSIX_IPC_PREFIX
         dir = POSIX_IPC_PREFIX;     /* from "config.h" */
 #else
         dir = "/tmp/";              /* default */
 #endif

 }
         /* 4dir must end in a slash */
     slash = (dir[strlen(dir) - ] == '/') ? "" : "/";
     snprintf(dst, PATH_MAX, "%s%s%s", dir, slash, name);

     return(dst);            /* caller can free() this pointer */

 }
 /* end px_ipc_name */

 char *
 Px_ipc_name(const char *name)
 {

     char    *ptr;

     if ( (ptr = px_ipc_name(name)) == NULL)
         err_sys("px_ipc_name error for %s", name);
     return(ptr);

 }