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I have also tried to use a named pipe created with mkfifo and this still happens. This appears to be a bug with the source highlighter. Compiled with: [bash]ifort -g -warn all -check all -traceback -o tester tester. If I try this technique with sequential access I don't encounter this problem.
Note, you need to write binary data with fortran so that it includes the sequential access record indicators which are stripped off for stream access. Thanks, -Z. Tags 1. All forum topics Previous Topic Next Topic. The less than simply binds the input file to stdin. Jim Dempsey. Copy link. The file test. I have no idea what system you guys are on but on GNU Linux cat is binary safe. A few preliminary tests show no difference in the data stream after running through cat:. Try running a tab character through it and not on tab boundry -1 e.
Previously, we did not know what OS you were on. We still don't know which version of IFort you are using. I cannot reproduce the error using Cygwin for cat -- no tab expansions on Cygwin either and IFort With that, you may be able to find out what is causing the problem.
I am running ifort The error is an 'Illegal seek' error whatever that is as stated in the original post. When implemented as a temp file, the lhs of pipe runs to completion creating a file prior to running the rhs of the pipe, and then attaches the file to stdin, being an actual file, fseek can be performed. When implemented as an actual pipe, the lhs can run concurrently with the rhs a little in advance of the rhs producing a continuous stream of data until program termination or pipe close function.
I'm notsurewhat fseek is sounds like a cfunction , but my intention is to just read the data from the pipe in sequential order using portable Fortran. You will note that the file is opened as unformatted, stream access. Is there really no way to do this with Fortran? Are we sure this isn't an issue with the compiler? After all stream access is F and my track record with ifort There are nice performance benefits to using a pipe as a read ahead mechanism rather than first writing to a file then reading the file.
I have taken a more careful look at your code, and I see some problems that I overlooked earlier. Once the stdin stream is closed, there is no more connection to the data input either through input redirection or using cat and a pipe. According to my reading of Metcalf, Reid and Cohen, Sec. I agree with the usefulness of what you want to do.
Yeah thanks for looking at this mecej4. I might do some more experimentation. As I said, this works if I use sequential, record based unformatted input, but fails with stream access. Any way, if anyone especially you folks over at Intel has any aditional wisdom I would appreciate it.
When I get a chance to run some tests I'll psot my findings here. Why not handle the file manipulation at the OS-shell level, and give the Fortran program a fixed name, as in: [bash]ln -s fort. This is referred to as formatted input as the function has to know the format of the data it is expecting integer, floating-point number, text string without spaces, etc. An example Consider a file that starts: 1 2 8. As far as our program is concerned, it is as if it were a giant character string starting: Notice how I had accidentally typed a space at the end of the first line.
This is quite common. This will be very important later on. Quick discussion: In this section we shall be dealing with situations where it is fairly easy to describe what we want to happen but actually making it happen involves some irritating and potentially confusing details.
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But, as in the accepted answer, invoking python with a -u is another option which forces stdin, stdout and stderr to be totally unbuffered. See the python 1 manpage for details. See the documentation on io for more information on text buffering, and use sys. If you still need this This simple test i've used to read binary file that contains 0x1A character in between. Without setting stdin to binary mode this test prints 1 as soon it treats 0x1A as EOF.
Of course it works on windows only, because depends on msvcrt module. Learn more. Reading binary data from stdin Ask Question. Asked 10 years, 9 months ago. Active 1 year, 10 months ago. Viewed 35k times. Is it possible to read stdin as binary data in Python 2. If so, how? Update 2 First off, thanks for all the answers. In case anyone was wondering, this is also related to the question I asked a few days ago.
Packaging and deploying a Jython program from Eclipse Some of that question was answered in this question. So I'll try to update my original question with some notes on what I have figured out so far. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Dan Menes Dan Menes 5, 1 1 gold badge 30 30 silver badges 35 35 bronze badges. I have tested this with 'type' and it appears to work.
That is, if I leave out the -u flag, I get one fewer character per line. Not sure if that helps. Even easier, it appears that all you need to do is: sys. I don't know if that's because I'm using CPython instead of Jython, or if it's because I'm running Windows XP Pro, and "type" behaves differently, or its because there is a magnetic anomaly in the Manassas area that makes computers do different things.
FWIW, I tried a number of ways to get Python to change the file mode after the interpreter had started, including accessing the C runtime's "setmode" function via ctypes. Nothing works for me. I smell a portability issue. Thanks for the info. I guess I'm going to have to do some fairly rigorous testing on multiple platforms. I hope this doesn't have to do with the JVM in use.
Show 1 more comments. From the docs see here : The standard streams are in text mode by default. I've tried -u with Python v3. But using sys. The OP's question was about Python 2. This simple test i've used to read binary file that contains 0x1A character in between import os, sys, msvcrt msvcrt. Frazil Frazil 1 1 silver badge 2 2 bronze badges.
But Windows is the only system where most people will run into a problem, so this should be an acceptable solution. This is the correct solution for Python 2 to retrieve the raw bytes from stdin on Windows. On Unix, there is no difference between binary and normal mode. See this thread: code. Jan-Philip Gehrcke Feb 20 '14 at I was getting a ValueError: insecure string pickle exception on Windows when trying to un pickle data that had been written to stdout in one process which was being piped into another.
The solution turned out to be adding a msvcrt. See here for solutions: stackoverflow. See stackoverflow. EvgeniSergeev Did you actually try it? Unless you're using the Windows Subsystem for Linux thing, which for these purposes we can consider to be not-Windows. The Overflow Blog. I followed my dreams and got demoted to software developer. Podcast How to think in React. Featured on Meta. Opt-in alpha test for a new Stacks editor. Visual design changes to the review queues.
I thought the program was complete, as the first test files uploaded correctly. When I tested with a binary file JPG. The results of uploading a 1. If filename is a null pointer, the freopen function shall attempt to change the mode of the stream to that specified by mode, as if the name of the file currently associated with the stream had been used. In this case, the file descriptor associated with the stream need not be closed if the call to freopen succeeds.
It is implementation-defined which changes of mode are permitted if any , and under what circumstances. But when I check the man page on my system with man 3 freopen , it doesn't say any of this at all. Furthermore, reading the man page, I find out the the option for binary adding 'b' to the mode is no longer recognized and only exists for archaic compliancy:. The mode string can also include the letter 'b' either as a last character or as a character between the characters in any of the two-character strings described above.
Ok, it appears what NominalAnimal said was correct. You can store binary data in a string, but the moment you use any function in the string. The easy solution is to make a separate function that takes a pointer to the binary data and do your string searches in that function, returning what pertinent information is needed. That way, the original data is never changed. See also 'unistd. You have to stop when fread function returns 0, which means it stopped to read : it encountered EOF.
Learn more. Asked 3 years, 10 months ago. Active 3 years, 9 months ago. Viewed times. Furthermore, reading the man page, I find out the the option for binary adding 'b' to the mode is no longer recognized and only exists for archaic compliancy: The mode string can also include the letter 'b' either as a last character or as a character between the characters in any of the two-character strings described above.
So right now I'm completely lost. Improve this question. Deanie Deanie 2, 2 2 gold badges 13 13 silver badges 29 29 bronze badges. It is not the stream, it's your code. All file handles in Linux and other POSIXy systems are always "binary"; they do not massage the stream contents at all. The issue is definitely in your code -- which you have chosen not to show --, not in any library function.
NominalAnimal Yes, I use fwrite to write the data to file. I've added my code above. You treat the fread data as a string by using strstr , strlen , and so on. Even easier, it appears that all you need to do is: sys. I don't know if that's because I'm using CPython instead of Jython, or if it's because I'm running Windows XP Pro, and "type" behaves differently, or its because there is a magnetic anomaly in the Manassas area that makes computers do different things.
FWIW, I tried a number of ways to get Python to change the file mode after the interpreter had started, including accessing the C runtime's "setmode" function via ctypes. Nothing works for me. I smell a portability issue.
Thanks for the info. I guess I'm going to have to do some fairly rigorous testing on multiple platforms. I hope this doesn't have to do with the JVM in use. Show 1 more comments. From the docs see here : The standard streams are in text mode by default.
I've tried -u with Python v3. But using sys. The OP's question was about Python 2. This simple test i've used to read binary file that contains 0x1A character in between import os, sys, msvcrt msvcrt. Frazil Frazil 1 1 silver badge 2 2 bronze badges. But Windows is the only system where most people will run into a problem, so this should be an acceptable solution. This is the correct solution for Python 2 to retrieve the raw bytes from stdin on Windows.
On Unix, there is no difference between binary and normal mode. See this thread: code. Jan-Philip Gehrcke Feb 20 '14 at I was getting a ValueError: insecure string pickle exception on Windows when trying to un pickle data that had been written to stdout in one process which was being piped into another. The solution turned out to be adding a msvcrt. You can perform an unbuffered read with: os. Jay Jay 1, 20 20 silver badges 32 32 bronze badges. Yann Ramin Yann Ramin If I then call sys.
How then do I determine the length correctly? How do you check and correct for this situation? Python does not have null terminated strings. I wonder then if it might be the 'type' command from the MS-DOS shell that is causing the loss of the final byte? I guess I will have to test the equivalent on Linux. I think this answer misses the point of the question: if the stream is in "text" mode, the results from read might be different than if the stream is in "binary" mode.
It might corrupt input stream on Windows e. Also, on Python 3 sys. It is undesirable behaviour if input is not text. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.
Email Required, but never shown. The Overflow Blog. I followed my dreams and got demoted to software developer. Podcast How to think in React. Featured on Meta. Opt-in alpha test for a new Stacks editor. Visual design changes to the review queues. Should we burninate [username]? Linked
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