74 lines
1.3 KiB
C
74 lines
1.3 KiB
C
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <libelf.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "_libelf.h"
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#include "../libelf_compat.h"
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void *
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libelf_mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)
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{
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void *p; /* malloc'ed pointer */
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size_t bufsize;
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if ((addr != NULL) || (flags != MAP_PRIVATE) || (prot != PROT_READ)) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (MAP_FAILED);
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}
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/*
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* Fall back to malloc+read.
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*/
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p = NULL;
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bufsize = 1024 * 1024;
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while (/*CONSTCOND*/true) {
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void *newp = realloc(p, bufsize);
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ssize_t rsz;
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if (newp == NULL) {
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free(p);
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LIBELF_SET_ERROR(RESOURCE, 0);
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return (MAP_FAILED);
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}
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p = newp;
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rsz = pread(fd, p, bufsize, 0);
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if (rsz == -1) {
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free(p);
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LIBELF_SET_ERROR(IO, errno);
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return (MAP_FAILED);
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} else if ((size_t) rsz > bufsize) {
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free(p);
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LIBELF_SET_ERROR(IO, EIO); /* XXX */
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return (MAP_FAILED);
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} else if ((size_t) rsz < bufsize) {
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/*
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* try to shrink the buffer.
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*/
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newp = realloc(p, (size_t) rsz);
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if (newp != NULL) {
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p = newp;
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}
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break;
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}
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bufsize *= 2;
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}
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return p;
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}
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int
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libelf_munmap(void *addr, size_t len)
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{
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free(addr);
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return 0;
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}
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