/* * Generate dependencies for one file. */ void do_depend(const char * filename, const char * command) { int mapsize; int pagesizem1 = getpagesize()-1; int fd; struct stat st; char * map; fd = open(filename, O_RDONLY); if (fd < 0) { fprintf(stderr,"cannot open file: %s\n",filename); return; } fstat(fd, &st); if (st.st_size == 0) { fprintf(stderr,"%s is empty\n",filename); close(fd); return; } mapsize = st.st_size; mapsize = (mapsize+pagesizem1) & ~pagesizem1; map = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0); if ((long) map == -1) { fprintf(stderr,"mmap failed\n"); close(fd); return; } if ((unsigned long) map % sizeof(unsigned long) != 0) { fprintf(stderr, "do_depend: map not aligned\n"); exit(1); } hasdep = 0; state_machine(map, map+st.st_size); if (hasdep) { puts(command); if (*command) define_precious(filename); } else { // Create empty target to avoid "no rule to create ..." when we delete/rename a file: printf("%s:\n", filename); } munmap(map, mapsize); close(fd); }
/* * Generate dependencies for one file. */ void do_depend(const char * filename, const char * command) { int mapsize; int pagesizem1 = getpagesize()-1; int fd; struct stat st; char * map; fd = open(filename, O_RDONLY); if (fd < 0) { perror(filename); return; } fstat(fd, &st); if (st.st_size == 0) { fprintf(stderr,"%s is empty\n",filename); close(fd); return; } mapsize = st.st_size; mapsize = (mapsize+pagesizem1) & ~pagesizem1; map = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0); if ((long) map == -1) { perror("mkdep: mmap"); close(fd); return; } if ((unsigned long) map % sizeof(unsigned long) != 0) { fprintf(stderr, "do_depend: map not aligned\n"); exit(1); } hasdep = 0; clear_config(); state_machine(map, map+st.st_size); if (hasdep) { puts(command); if (*command) define_precious(filename); } munmap(map, mapsize); close(fd); }