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======================================================================== ============================== task_01.c ============================= ======================================================================== A program that accepts as argument a "pathname", open the file and using a partition size of the file bytes of 80 bytes, create an output file in which shall contain the following: Block 1 // the first 80 Bytes Block 2 // the next 80 Bytes Failure to pass an argument to the program must use standard input as input file. ======================================================================== ============================= task_01_a.c ============================ ======================================================================== Edit the file task_1.c so that once the writing in the output file and before closing, we could indicate in its first line the number of labels "block i " had written that looks like this: The number of blocks is <number_blocks> Block 1 // the first 80 bytes Block 2 // the next 80 bytes ======================================================================== ============================== task_02.c ============================= ======================================================================== A macro in C that implements the macro S_ISREG (mode) using the flags for it <sys/stat.h> defined for the st_mode field of struct stat. # define S_ISREG2 (mode) ... ======================================================================== ============================== task_03.c ============================= ======================================================================== This program is designed to supply to first create a program with the FILE CREATION and do a ls-l to look at the permissions and understand the call umask. Secondly (after the files are created) a second program with the part of CHANGE OF PERMISSIONS to understand the change of permissions on the permissions you currently have a file against an absolute setting permissions._ ======================================================================== ============================== task_04.c ============================= ======================================================================== A program using system calls necessary to accept as input: - An argument represents the 'pathname' of a directory. - Another argument which is a 4-digit octal number (similar to that can be used to change the permissions on the system call chmod) The program must use the octal number indicated in the second argument to change the permissions of all files found in the directory indicated in the first argument. The program should provide the standard output a line for each file in the directory that is formed by: <file_name>: <old_permits> <new_permits> If you can not change the permissions of a given file must specify the following information on the stardard output: <file_name>: <errno> <new_permits> ======================================================================== ============================== task_05.c ============================= ======================================================================== task_5 have two files: task_5_a.c - consumer process run: consumerFIFO & task_5_b.c - producer process run: producerFIFO <message> Task_5 use a FIFO file, the consumer process read the message of producer process ======================================================================== ============================== task_06.c ============================= ======================================================================== A pipe example program ======================================================================== ============================== task_07.c ============================= ======================================================================== A pipe example program and input-output standard redirection: "ls | sort" ======================================================================== ============================== task_08.c ============================= ======================================================================== Working with system calls Process Subsystem POSIX 2.10 A pipe example program and input-output standard redirection: "ls | sort" using the call dup2 ======================================================================== ============================== task_09.c ============================= ======================================================================== Test the program, then delete the comments (1) and try it again.Try to understand what happens to the variables and especially with messages on screen when the kernel is on / off the buffering mechanism. ======================================================================== ============================== task_09_a.c =========================== ======================================================================== A program to launch five child processes. Each is identified in the standard output, showing a message like I am the son PID. The parent process will simply have to wait for the completion of all their children and each time it detects the end of one of his children written to standard output a message like: My son just finished with <PID> I only have <NUM_HIJOS> living children. ======================================================================== ============================== task_09_b.c =========================== ======================================================================== This program is a modification of the previous task in which the parent process waiting children first created in order odd (1st, 3rd, 5th) and then the children peer (2nd & 4th).