errno pb Post: 54240

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1. Programming

Getting errno in a Multithreaded program

In Tru64 Unix, the 'errno' variable is not thread safe. Could anybody help me about how to make it thread safe or how to check 'errno' in a Multithreaded program ???? The Programming process is like this. There are some definite number of threads having their own task. There is one...

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Hi errno in sys/stat.h

How should I use errno in a c program and what info does it have . I am working with directories and files. So can any one tell me How to access errno?I am using the stat() function on \etc directory and I am alble to access only the half of the directories.I am not able to access other half and...

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errno

Hey, Can I assume that for certain function calls, errno can never be set to a certain value. More specifically, can I assume that for if the stat function call fails, the errno can never be or "No space left on device." I am assuming that a read function cannot fail because of no space...

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does perror() set errno?

here the program gives a odd result: #include <stdio.h> int main(){ perror("first"); perror("next"); return 0; } result: first: Success next: Illegal seek why? any resonable explanation? i found no information about this in man pages. thanks in advance

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need help about get errno [ENXIO] for mmap

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[Errno 256] No more mirrors to try.

Dear all, CentOS 6 After executing "yum update -y" command I am facing this error. Please help me out. thanks in advance. Full error & error code is given as follow: ...

7. Programming

Getpwnam_r returning null with errno 25

I am calling getpwnam_r with all proper argument as below:- rv = getpwnam_r(name, result, buffer, buflen); This program runs fine on sol 8/9/10. But on sol 11 it returns NULL with errno set to 25 (#define ENOTTY 25 /* Inappropriate ioctl for device */) All boxes are...

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Function open() sets errno

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[Ultrix] /etc/init failed, errno 2

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Errno.h symbols

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ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)

10 More Discussions You Might Find Interesting

1. Programming

Getting errno in a Multithreaded program

Discussion started by: S.Vishwanath

2. Programming

Hi errno in sys/stat.h

Discussion started by: vijlak

3. Programming

errno

Discussion started by: the_learner

4. Programming

does perror() set errno?

Discussion started by: ebd