04-21-2011
Quote:
Originally Posted by
shishong
It's 64-bit. When I use input redirect ( < ) on a smaller test file, I get no ouput.
yes... 'look' doesn't do quite what I thought it did. When you give it no input file it tries to use something in /usr/share/dict!
So no, redirection won't work in this case.
Annoying that your version of
look can't support large files on a 64-bit system! This may be a bug.
---------- Post updated at 01:53 PM ---------- Previous update was at 01:46 PM ----------
Looking at the code it doesn't have an explicit built-in limit, it just uses mmap. When I have access to a 64-bit machine later today I'll see what mmap does on 64-bit systems for enormous files.
This User Gave Thanks to Corona688 For This Post:
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MMAP2(2) Linux Programmer's Manual MMAP2(2)
NAME
mmap2 - map files or devices into memory
SYNOPSIS
#include <sys/mman.h>
void *mmap2(void *addr, size_t length, int prot,
int flags, int fd, off_t pgoffset);
DESCRIPTION
The mmap2() system call operates in exactly the same way as mmap(2), except that the final argument specifies the offset into the file in
4096-byte units (instead of bytes, as is done by mmap(2)). This enables applications that use a 32-bit off_t to map large files (up to
2^44 bytes).
RETURN VALUE
On success, mmap2() returns a pointer to the mapped area. On error -1 is returned and errno is set appropriately.
ERRORS
EFAULT Problem with getting the data from userspace.
EINVAL (Various platforms where the page size is not 4096 bytes.) offset * 4096 is not a multiple of the system page size.
mmap2() can return any of the same errors as mmap(2).
VERSIONS
mmap2() is available since Linux 2.3.31.
CONFORMING TO
This system call is Linux-specific.
NOTES
Nowadays, the glibc mmap() wrapper function invokes this system call rather than the mmap(2) system call.
On ia64, the unit for offset is actually the system page size, rather than 4096 bytes.
SEE ALSO
getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)
COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-04-22 MMAP2(2)