a22e08d763
This means that we don't have to do rounding calculations for page boundaries. (We do all our accesses via the mmapped area now.) Reviewed by:
161 lines
4.8 KiB
C
161 lines
4.8 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)nlist.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <errno.h>
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#include <a.out.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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int
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nlist(name, list)
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const char *name;
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struct nlist *list;
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{
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int fd, n;
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fd = open(name, O_RDONLY, 0);
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if (fd < 0)
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return (-1);
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n = __fdnlist(fd, list);
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(void)close(fd);
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return (n);
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}
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#define ISLAST(p) (p->n_un.n_name == 0 || p->n_un.n_name[0] == 0)
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int
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__fdnlist(fd, list)
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register int fd;
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register struct nlist *list;
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{
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register struct nlist *p, *symtab;
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register caddr_t strtab, a_out_mmap;
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register off_t stroff, symoff;
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register u_long symsize;
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register int nent;
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size_t strsize;
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struct nlist nbuf[1024];
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struct exec * exec;
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struct stat st;
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/* check that file is at least as large as struct exec! */
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if ((fstat(fd, &st) < 0) || (st.st_size < sizeof(struct exec)))
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return (-1);
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/* Check for files too large to mmap. */
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if (st.st_size > SIZE_T_MAX) {
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errno = EFBIG;
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return (-1);
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}
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/*
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* Map the whole a.out file into our address space.
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* We then find the string table withing this area.
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* We do not just mmap the string table, as it probably
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* does not start at a page boundary - we save ourselves a
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* lot of nastiness by mmapping the whole file.
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*
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* This gives us an easy way to randomly access all the strings,
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* without making the memory allocation permanent as with
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* malloc/free (i.e., munmap will return it to the system).
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*/
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a_out_mmap = mmap(NULL, (size_t)st.st_size, PROT_READ, 0, fd, (off_t)0);
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if (a_out_mmap == (char *)-1)
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return (-1);
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exec = (struct exec *)a_out_mmap;
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if (N_BADMAG(*exec)) {
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munmap(a_out_mmap, (size_t)st.st_size);
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return (-1);
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}
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symoff = N_SYMOFF(*exec);
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symsize = exec->a_syms;
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stroff = symoff + symsize;
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/* find the string table in our mmapped area */
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strtab = a_out_mmap + stroff;
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symtab = (struct nlist *)(a_out_mmap + symoff);
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/*
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* clean out any left-over information for all valid entries.
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* Type and value defined to be 0 if not found; historical
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* versions cleared other and desc as well. Also figure out
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* the largest string length so don't read any more of the
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* string table than we have to.
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*
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* XXX clearing anything other than n_type and n_value violates
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* the semantics given in the man page.
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*/
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nent = 0;
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for (p = list; !ISLAST(p); ++p) {
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p->n_type = 0;
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p->n_other = 0;
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p->n_desc = 0;
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p->n_value = 0;
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++nent;
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}
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while (symsize > 0) {
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register int soff;
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symsize-= sizeof(struct nlist);
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soff = symtab->n_un.n_strx;
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if (soff != 0 && (symtab->n_type & N_STAB) == 0)
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for (p = list; !ISLAST(p); p++)
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if (!strcmp(&strtab[soff], p->n_un.n_name)) {
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p->n_value = symtab->n_value;
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p->n_type = symtab->n_type;
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p->n_desc = symtab->n_desc;
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p->n_other = symtab->n_other;
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if (--nent <= 0)
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break;
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}
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symtab++;
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}
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munmap(a_out_mmap, (size_t)st.st_size);
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return (nent);
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}
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