ex1's Introduction
kotek, yoavabadi Aviv Kotek (203973490), Yoav Abadi (305613903) EX: 1 FILES: osm.cpp -- osm implementation osm.h -- osm header file ------------- Assignment 1 ------------- Analysing result of command 'strace WhatIDo 0' (with argument 0): ------------------------------------------------------------- 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. ------------------------------------------------------------- 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. -------------------------------------------------------------- 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. -------------------------------------------------------------- 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). -------------------------------------------------------------- close(3) = 0 This system call succeed closing the file, as return value is 0. -------------------------------------------------------------- unlink("Welcome/To/OS2018") = 0 This sys-call deleted the file OS2018 from the file system. this call also succeeded. -------------------------------------------------------------- rmdir("Welcome/To/") = 0 rmdir("Welcome/") = 0 Both sys-calls deletes given directories (Welcome and To) and succeed. -------------------------------------------------------------- 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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