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kotek, yoavabadi
Aviv Kotek (203973490), Yoav Abadi (305613903)
EX: 1

FILES:
osm.cpp -- osm implementation
osm.h -- osm header file

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Assignment 1
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Analysing result of command 'strace WhatIDo 0' (with argument 0):
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mkdir("Welcome", 0775)                  = 0
mkdir("Welcome/To", 0775)               = 0

This command creates Welcome directory successfully (return value = 0)
And creates Inner 'To' directory successfully.

mode 775 is giving you permission to the file.
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open("Welcome/To/OS2018", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3

This command uses the open() sys-call:
it opens the file OS2018  in folder 'Welcome/To with flags of
'write' and 'create' and with O_trunc which will truncate file to 0 length.
'= 3' means the function returned FILE DESCRIPTOR is 3. In case of failure
we will have =-1, so this is not a failure.

flags -
O_WRONLY - Open for writing only.
O_CREAT - If the file exists, this flag has no effect, Otherwise, the file is created.
O_TRUNC - if the file exists and is a regular file, and the file is successfully opened by O_WRONLY,
 its length is truncated to 0 and the mode and owner are unchanged.

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fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0

This command uses the fstat() sys-call:
Which returns information about the 'os2018' file,
it returned 0 means the sys-call completed successfully.
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write(3, "kotek\nIf you haven't read the co"..., 74) = 74

Program calls write sys-call and tries to write 74 characters to OS2018 file,
about the course guidelines, and it did succeed (we can see by the
descriptor id that has been returned != -1).
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close(3)                                = 0

This system call succeed closing the file,
as return value is 0.
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unlink("Welcome/To/OS2018")             = 0

This sys-call deleted the file OS2018 from the file system.
this call also succeeded.
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rmdir("Welcome/To/")                    = 0
rmdir("Welcome/")                       = 0

Both sys-calls deletes given directories (Welcome and To) and succeed.
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exit_group(0)                           = ?
+++ exited with 0 +++

This sys-call exit all threads in the process and terminates them.
We can see that it has succeeded.
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