Stat each file and mmap(3) only as much as is really needed
Signed-off-by: Christoph Lohmann <20h@r-36.net>master
parent
78504360bf
commit
7f4f527303
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@ -1,6 +1,7 @@
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/* $Id: catpoint.c,v 1.2 2013/03/28 12:00:48 lostd Exp $ */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <err.h>
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@ -42,6 +43,7 @@ int
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main(int argc, char *argv[])
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{
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int c, i, fd;
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struct stat statbuf;
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if (argc == 1)
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errx(1, "usage: %s file ...", argv[0]);
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@ -59,7 +61,9 @@ main(int argc, char *argv[])
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fd = open(argv[i], O_RDONLY, 0);
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if (fd == -1)
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err(1, "open: %s", argv[i]);
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p[i] = mmap(NULL, 0x1000, PROT_READ, MAP_PRIVATE, fd, 0);
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if (fstat(fd, &statbuf) < 0)
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err(1, "fstat: %s", argv[i]);
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p[i] = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (p[i] == MAP_FAILED)
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err(1, "mmap");
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close(fd);
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