From cd74fd521c3e0cc80cd4640d5de059ba14b9c563 Mon Sep 17 00:00:00 2001
From: Aldegheri Alessandro <alessandroaldegherivr@gmail.com>
Date: Wed, 29 Mar 2023 17:27:38 +0200
Subject: [PATCH] Pseudocode for semctl, semget and semop functions

---
 mentos/src/ipc/sem.c      | 76 +++++++++++++++++++++++++++++++++++++--
 programs/tests/t_semget.c |  4 +--
 2 files changed, 75 insertions(+), 5 deletions(-)

diff --git a/mentos/src/ipc/sem.c b/mentos/src/ipc/sem.c
index 6f4ff9a..1c1c547 100644
--- a/mentos/src/ipc/sem.c
+++ b/mentos/src/ipc/sem.c
@@ -17,20 +17,90 @@
 //test
 long sys_semget(key_t key, int nsems, int semflg)
 {
-    printf("qui");
+    /*PSEUDOCODE (todo)*/
+
+
+    /*
+    Check if num_sems is a valid value
+    */
+    /* .... */
+
+
+    /*
+    Compute the IPC id using key. (Hashing Algorithm?)
+    */
+    /* .... */
+
+
+    /*
+    Check if a semaphore set with the ID already exists (and then check for IPC_EXCL flag)
+    */
+    /* .... */
+
+    /*
+    If the semaphore does not exist, create a new semaphore set with the specified number of sems
+    (allocation, initialization...) 
+    */
+    /* .... */
+
+    /*
+    Set the semaphore set permissions (default 0666)
+    */
+    /* .... */
+
+
+    /*
+    Return the new semaphore set ID
+    */
+    /* .... */
+
+
+
+
+
+    //printf("qui");  test
     //TODO("Not implemented");
     return 0;
 }
 
 long sys_semop(int semid, struct sembuf *sops, unsigned nsops)
 {
-    TODO("Not implemented");
+    /*
+    Check if semid is a valid semaphore set identifier
+    */
+    /* .... */
+
+
+    /*
+    Handle the sembuf structure and perform the operation (spinlocks?)
+    */
+    /* .... */
+
+    /*
+    Update the semaphores values
+    */
+    /* .... */
+
+
+    //TODO("Not implemented");
     return 0;
 }
 
 long sys_semctl(int semid, int semnum, int cmd, unsigned long arg)
 {
-    TODO("Not implemented");
+
+    /*
+    Check if semid is a valid semaphore identifier
+    */
+    /* .... */
+
+    /*
+    Check the cmd parameter (GETVAL, SETVAL...) and perform the operation
+    */
+    /* .... */
+
+
+    //TODO("Not implemented");
     return 0;
 }
 
diff --git a/programs/tests/t_semget.c b/programs/tests/t_semget.c
index 00f7899..dab2594 100644
--- a/programs/tests/t_semget.c
+++ b/programs/tests/t_semget.c
@@ -1,8 +1,8 @@
-//testtt
+//test
 #include <ipc/sem.h>
 int main()
 {
-    long i = semget(0,0,0);
+    long i = semget(0,0,0);  //checking if the syscalls are already linked
     
     return 0;
 }