Baguette/catpoint
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Stat each file and mmap(3) only as much as is really needed

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Signed-off-by: Christoph Lohmann <20h@r-36.net>
This commit is contained in:
Ekkie 2020-05-04 12:51:49 +02:00 committed by Christoph Lohmann
parent 78504360bf
commit 7f4f527303
1 changed files with 5 additions and 1 deletions
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6
catpoint.c
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@ -1,6 +1,7 @@
/* $Id: catpoint.c,v 1.2 2013/03/28 12:00:48 lostd Exp $ */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <err.h>
@ -42,6 +43,7 @@ int
main(int argc, char *argv[])
{
int c, i, fd;
struct stat statbuf;
if (argc == 1)
errx(1, "usage: %s file ...", argv[0]);
@ -59,7 +61,9 @@ main(int argc, char *argv[])
fd = open(argv[i], O_RDONLY, 0);
if (fd == -1)
err(1, "open: %s", argv[i]);
p[i] = mmap(NULL, 0x1000, PROT_READ, MAP_PRIVATE, fd, 0);
if (fstat(fd, &statbuf) < 0)
err(1, "fstat: %s", argv[i]);
p[i] = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (p[i] == MAP_FAILED)
err(1, "mmap");
close(fd);