add munmap call

SCCS-vsn: usr.bin/tail/forward.c 5.6

diff --git a/usr/src/usr.bin/tail/forward.c b/usr/src/usr.bin/tail/forward.c
index 2c38703..8370ecd 100644 (file)
--- a/usr/src/usr.bin/tail/forward.c
+++ b/usr/src/usr.bin/tail/forward.c
@@ -169,18 +169,19 @@ rlines(fp, off, sbp)
 {
        register off_t size;
        register char *p;
 {
        register off_t size;
        register char *p;

+       char *start;

 
        if (!(size = sbp->st_size))
                return;
 
 
        if (!(size = sbp->st_size))
                return;
 

-       if ((p = mmap(NULL,
+       if ((start = mmap(NULL,

            size, PROT_READ, MAP_FILE, fileno(fp), (off_t)0)) == (caddr_t)-1) {
                err(0, "%s", strerror(errno));
                return;
        }
 
        /* Last char is special, ignore whether newline or not. */
            size, PROT_READ, MAP_FILE, fileno(fp), (off_t)0)) == (caddr_t)-1) {
                err(0, "%s", strerror(errno));
                return;
        }
 
        /* Last char is special, ignore whether newline or not. */

-       for (p += size - 1; --size;)
+       for (p = start + size - 1; --size;)

                if (*--p == '\n' && !--off) {
                        ++p;
                        break;
                if (*--p == '\n' && !--off) {
                        ++p;
                        break;


@@ -193,4 +194,8 @@ rlines(fp, off, sbp)
                ierr();
                return;
        }
                ierr();
                return;
        }

+       if (munmap(start, size)) {
+               err(0, "%s", strerror(errno));
+               return;
+       }

 }
 }