• chmike (8/8) May 19 2016 Hello,
• ag0aep6g (6/13) May 19 2016 I think the description for ErrnoException is a bit misleading. I'm
• Adam D. Ruppe (4/7) May 19 2016 It just means the Phobos functions that use these functions (like
• Alex Parrill (5/14) May 19 2016 ErrnoException is the exception thrown by errnoEnforce, which is

chmike <christophe meessen.net> writes:

Hello,

I'm planning to call some posix functions core.sys.posix that may 
set the errno value in case of error. e.g. read() or write().

Checking the std.exception documentation I see that 
ErrnoException may be thrown when errors setting errno may occur. 
Does this affect the posix calls ?

 From what I saw in the code, it doesn't seam the case. Just 
making sure I'm correct.

ag0aep6g <anonymous example.com> writes:

On 05/19/2016 03:05 PM, chmike wrote:
 I'm planning to call some posix functions core.sys.posix that may set
 the errno value in case of error. e.g. read() or write().

 Checking the std.exception documentation I see that ErrnoException may
 be thrown when errors setting errno may occur. Does this affect the
 posix calls ?

  From what I saw in the code, it doesn't seam the case. Just making sure
 I'm correct.

I think the description for ErrnoException is a bit misleading. I'm 
fairly certain that there is no code running that watches errno and 
throws an ErrnoException whenever it gets set. Rather, code that calls C 
functions which set errno can/should use ErrnoException and the 
errnoEnforce helper function to make a nice Exception from an errno value.

Adam D. Ruppe <destructionator gmail.com> writes:

On Thursday, 19 May 2016 at 13:05:19 UTC, chmike wrote:
 Checking the std.exception documentation I see that 
 ErrnoException may be thrown when errors setting errno may 
 occur. Does this affect the posix calls ?

It just means the Phobos functions that use these functions (like 
std.file or std.socket) might throw the exception, not the C 
functions themselves.

Alex Parrill <initrd.gz gmail.com> writes:

On Thursday, 19 May 2016 at 13:05:19 UTC, chmike wrote:
 Hello,

 I'm planning to call some posix functions core.sys.posix that 
 may set the errno value in case of error. e.g. read() or 
 write().

 Checking the std.exception documentation I see that 
 ErrnoException may be thrown when errors setting errno may 
 occur. Does this affect the posix calls ?

 From what I saw in the code, it doesn't seam the case. Just 
 making sure I'm correct.

ErrnoException is the exception thrown by errnoEnforce, which is 
a convenient function for checking system calls.

D links to the same Posix functions that C does; their behavior 
is exactly the same (ie they don't throw).