write() system call arguments


 
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# 1  
Old 04-09-2011
write() system call arguments

Hi,

I'm trying to understand the arguments from this system call, can someone help me figure it out?
Code:
write(1, "/home/nick/11sp/fred\n", 27/home/nick/11sp/fred) = 27

for argument 1, i know it is a file descriptor which specifies standard output. Argument 2, i believe is "what is to be written"... what's argument 3? and what is 27?

Thanks

Last edited by Scott; 04-09-2011 at 11:34 PM..
# 2  
Old 04-09-2011
I believe you get this msg from command strace. 27 is the return value of write, which represent the number of chars writed to stdout. And this format is not the standard call of write; it is sort of fake code.
# 3  
Old 04-09-2011
okay! thx...

is write() = 27 just to make sure that 27 bytes are written?

to make sure it doesn't return -1?
# 4  
Old 04-10-2011
No. strace is telling you what happened. It is not presenting C code. It means that write() was invoked. And it returned 27.
# 5  
Old 04-10-2011
ah okay, thank you.
 
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