diff options
Diffstat (limited to 'libexec')
| -rw-r--r-- | libexec/rtld-aout/rtld.c | 57 |
1 files changed, 56 insertions, 1 deletions
diff --git a/libexec/rtld-aout/rtld.c b/libexec/rtld-aout/rtld.c index 202dfa4..b889020 100644 --- a/libexec/rtld-aout/rtld.c +++ b/libexec/rtld-aout/rtld.c @@ -27,7 +27,7 @@ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * - * $Id: rtld.c,v 1.5 1993/11/30 20:47:49 jkh Exp $ + * $Id: rtld.c,v 1.4 1993/11/22 19:05:27 jkh Exp $ */ #include <machine/vmparam.h> @@ -1031,6 +1031,7 @@ char *fmt; va_end(ap); } +#if 1 caddr_t sbrk(incr) int incr; @@ -1075,3 +1076,57 @@ xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk); return oldbrk; } + +#else + +caddr_t +sbrk(incr) +int incr; +{ + int fd = -1; + caddr_t oldbrk; + +xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk); +#if DEBUG +xprintf("sbrk: incr = %#x, curbrk = %#x\n", incr, curbrk); +#endif + if (curbrk == 0 && (curbrk = mmap(0, PAGSIZ, + PROT_READ|PROT_WRITE, + MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) { + xprintf("Cannot map anonymous memory"); + _exit(1); + } + + /* There's valid memory from `curbrk' to next page boundary */ + if ((long)curbrk + incr <= (((long)curbrk + PAGSIZ) & ~(PAGSIZ - 1))) { + oldbrk = curbrk; + curbrk += incr; + return oldbrk; + } + /* + * If asking for than currently left in this chunk, + * go somewhere completely different. + */ + +#ifdef NEED_DEV_ZERO + fd = open("/dev/zero", O_RDWR, 0); + if (fd == -1) + perror("/dev/zero"); +#endif + + if ((curbrk = mmap(0, incr, + PROT_READ|PROT_WRITE, + MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) { + perror("Cannot map anonymous memory"); + } + +#ifdef NEED_DEV_ZERO + close(fd); +#endif + + oldbrk = curbrk; + curbrk += incr; + + return oldbrk; +} +#endif |
