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0

What part of the system sets up the buffering of the three standard streams when a program is started?

Is this part of linux, or glibc, or maybe bash? Does POSIX define the behaviour, or is it part of C?

Posix has some answers:

https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_05

At program start-up, three streams are predefined and need not be
opened explicitly: standard input (for reading conventional input),
standard output (for writing conventional output), and standard error
(for writing diagnostic output). When opened, the standard error
stream is not fully buffered; the standard input and standard output
streams are fully buffered if and only if the stream can be determined
not to refer to an interactive device.

So if the system can determine that streams are NOT interactive, they CAN be fully buffered (except stderr), but in practice what part of the system does this determining?

linux stdout stderr buffer

share|improve this question

edited 6 secs ago

Evan Benn

asked 4 hours ago

Evan BennEvan Benn

1184

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Some similar questions that don't quite touch the right points:
  
  – Evan Benn
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  unix.stackexchange.com/questions/56634 unix.stackexchange.com/questions/25372 unix.stackexchange.com/questions/116453
  
  – Evan Benn
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Start here
  
  – Thomas Dickey
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  is your question specifically about the stdio buffering? Then please add the stdio tag. Notice that many programs don't do any userland buffering (eg. cat), and other programs do their own, different from and bypassing stdio (eg. PerlIO in perl).
  
  – mosvy
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It would be completely different for different types of file. The kernel do have buffer mechanism, but userspace usually have option to open that file with kernel buffer disabled and do its own userspace buffering
  
  – 炸鱼薯条德里克
  2 hours ago
  

  
  
  
  

add a comment | 

0

What part of the system sets up the buffering of the three standard streams when a program is started?

Is this part of linux, or glibc, or maybe bash? Does POSIX define the behaviour, or is it part of C?

Posix has some answers:

https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_05

At program start-up, three streams are predefined and need not be
opened explicitly: standard input (for reading conventional input),
standard output (for writing conventional output), and standard error
(for writing diagnostic output). When opened, the standard error
stream is not fully buffered; the standard input and standard output
streams are fully buffered if and only if the stream can be determined
not to refer to an interactive device.

So if the system can determine that streams are NOT interactive, they CAN be fully buffered (except stderr), but in practice what part of the system does this determining?

linux stdout stderr buffer

share|improve this question

edited 6 secs ago

Evan Benn

asked 4 hours ago

Evan BennEvan Benn

1184

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Some similar questions that don't quite touch the right points:
  
  – Evan Benn
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  unix.stackexchange.com/questions/56634 unix.stackexchange.com/questions/25372 unix.stackexchange.com/questions/116453
  
  – Evan Benn
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Start here
  
  – Thomas Dickey
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  is your question specifically about the stdio buffering? Then please add the stdio tag. Notice that many programs don't do any userland buffering (eg. cat), and other programs do their own, different from and bypassing stdio (eg. PerlIO in perl).
  
  – mosvy
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It would be completely different for different types of file. The kernel do have buffer mechanism, but userspace usually have option to open that file with kernel buffer disabled and do its own userspace buffering
  
  – 炸鱼薯条德里克
  2 hours ago
  

  
  
  
  

add a comment | 

What part of the system sets up the buffering of the three standard streams when a program is started?

Is this part of linux, or glibc, or maybe bash? Does POSIX define the behaviour, or is it part of C?

Posix has some answers:

https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_05

At program start-up, three streams are predefined and need not be
opened explicitly: standard input (for reading conventional input),
standard output (for writing conventional output), and standard error
(for writing diagnostic output). When opened, the standard error
stream is not fully buffered; the standard input and standard output
streams are fully buffered if and only if the stream can be determined
not to refer to an interactive device.

So if the system can determine that streams are NOT interactive, they CAN be fully buffered (except stderr), but in practice what part of the system does this determining?

linux stdout stderr buffer

share|improve this question

edited 6 secs ago

Evan Benn

asked 4 hours ago

Evan BennEvan Benn

1184

share|improve this question

edited 6 secs ago

Evan Benn

asked 4 hours ago

Evan BennEvan Benn

1184

share|improve this question

edited 6 secs ago

Evan Benn

asked 4 hours ago

Evan BennEvan Benn

1184

asked 4 hours ago

Evan BennEvan Benn

1184

asked 4 hours ago

Evan BennEvan Benn

1184