4  * SPDX-License-Identifier: BSD-2-Clause
48 	int		fd;  member
51 // All the line_buffer stuff can be replaced by fgetstr()
55 	int		fd;  member
69 	lb->pos = lb->eos = lb->buf;	// Reset to no data condition  in lb_fill()
70 	rv = read(lb->fd, lb->buf, sizeof(lb->buf));  in lb_fill()
73 	lb->pos = lb->buf;  in lb_fill()
74 	lb->eos = lb->buf + rv;  in lb_fill()
81 	close(lb->fd);  in lb_fini()
88 	lb->fd = open(fn, O_RDONLY);  in lb_init()
89 	if (lb->fd == -1)  in lb_init()
91 	lb->pos = lb->eos = lb->buf;  in lb_init()
99 // True -> data returned
100 // False -> EOF / ERROR w/o data
104 	char *bufeos = buffer + buflen - 1;	// point at byte for NUL at eos  in lb_1line()
108 		if (lb->pos >= lb->eos) {	// Refill empty buffer  in lb_1line()
116 		*walker = *lb->pos++;  in lb_1line()
171 			return (0);	/* PARSE ERROR -- what to do? */  in symbol_addr()
181  * Parse /proc/kcore to find if we can get the data for @len bytes that are
183  * kernel exports for the 'safe' areas to touch. We can read random kernel
184  * varaibles, but we can't read arbitrary addresses since it doesn't export
196 	ef.fd = open(KCORE_PATH, O_RDONLY);  in read_at_address()
197 	if (ef.fd == -1) {  in read_at_address()
208 	rv = read(ef.fd, ef.buf, sizeof(ef.buf));  in read_at_address()
211 		close(ef.fd);  in read_at_address()
217 		close(ef.fd);  in read_at_address()
220 	if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||	/* Layout ? */  in read_at_address()
221 	    hdr->e_ident[EI_DATA] != ELF_TARG_DATA ||  in read_at_address()
222 	    hdr->e_ident[EI_VERSION] != EV_CURRENT ||	/* Version ? */  in read_at_address()
223 	    hdr->e_version != EV_CURRENT ||  in read_at_address()
224 	    hdr->e_machine != ELF_TARG_MACH ||		/* Machine ? */  in read_at_address()
225 	    hdr->e_type != ET_CORE) {  in read_at_address()
227 		close(ef.fd);  in read_at_address()
231 	phdr = (Elf64_Phdr *)(ef.buf + hdr->e_phoff);  in read_at_address()
232 	for (int i = 0; i < hdr->e_phnum; i++) {  in read_at_address()
238 		lseek(ef.fd, (off_t)phdr[i].p_offset + addr - phdr[i].p_vaddr,  in read_at_address()
240 		rv = read(ef.fd, buf, len);  in read_at_address()
242 			perror("Can't read buffer\n");  in read_at_address()
243 		close(ef.fd);  in read_at_address()
247 	close(ef.fd);  in read_at_address()
262 		fprintf(stderr, "Can't find symbol %s", sym);  in data_from_kernel()
266 		fprintf(stderr, "Can't read from kernel");  in data_from_kernel()