Implemented getpriority and setpriority

libc.gmk

@@ -209,7 +209,9 @@ C_POSIX := \
 	wait/waitpid.o \
 	posix/waitpoll.o \
 	posix/writev.o \
-	posix/uname.o
+	posix/uname.o \
+	posix/getpriority.o \
+	posix/setpriority.o
 
 C_REGEX := \
 	regex/regcomp.o \
@@ -529,6 +531,7 @@ C_STDLIB := \
 	stdlib/mprec.o \
 	stdlib/mulsi3.o \
 	stdlib/posix_memalign.o \
+	stdlib/processscan_hook_function.o \
 	stdlib/program_name.o \
 	stdlib/putenv.o \
 	stdlib/qsort.o \

library/include/sys/resource.h

@@ -68,10 +68,20 @@ struct rusage
 #define RUSAGE_BOTH     (-2) /* sys_wait4() uses this */
 #define RUSAGE_THREAD   1    /* only the calling thread */
 
+#define PRIO_MIN (-127)
+#define PRIO_MAX 127
+
+#define PRIO_PROCESS 0
+#define PRIO_PGRP    1
+#define PRIO_USER    2
+
 extern int getrlimit(int resource, struct rlimit *rlp);
 extern int setrlimit(int resource, const struct rlimit *rlp);
 extern int getrusage(int who, struct rusage *usage);
 
+extern int getpriority (int which, unsigned int who);
+extern int setpriority (int which, unsigned int who, int priority);
+
 __END_DECLS
 
 #endif /* _SYS_RESOURCE_H */

library/posix/getpriority.c

@@ -0,0 +1,34 @@
+/*
+ * $Id: resource_getpriority.c,v 1.0 2025-04-13 14:37:27 clib4devs Exp $
+*/
+
+#include <sys/resource.h>
+
+#ifndef _STDLIB_HEADERS_H
+#include "stdlib_headers.h"
+#endif /* _STDLIB_HEADERS_H */
+
+int
+getpriority (int which, unsigned int who) {
+    switch (which) {
+        case PRIO_PROCESS:
+        case PRIO_PGRP:
+        case PRIO_USER: {
+            struct Hook h = {{NULL, NULL}, (HOOKFUNC) processscan_hook_function, NULL, NULL};
+
+            int32 process = ProcessScan(&h, (CONST_APTR) who, 0);
+            if (process > 0) {
+                struct Process *cli_process = (struct Process *) process;
+                return cli_process->pr_Task.tc_Node.ln_Pri;
+            }
+            else {
+                __set_errno(ESRCH);
+                return -1;
+            }
+            break;
+        }
+        default:
+            __set_errno(EINVAL);
+            return -1;
+    }
+}

library/posix/kill.c

@@ -8,18 +8,6 @@
 
 #include <unistd.h>
 
-static APTR
-hook_function(struct Hook *hook, APTR userdata, struct Process *process) {
-    uint32 pid = (uint32) userdata;
-    (void) (hook);
-
-    if (process->pr_ProcessID == pid) {
-        return process;
-    }
-
-    return 0;
-}
-
 int
 kill(pid_t pid, int signal_number) {
     struct Process *cli_process;
@@ -42,7 +30,7 @@ kill(pid_t pid, int signal_number) {
             SHOWVALUE(result);
         } else {
             SHOWMSG("This is a kill for a different process. Search it");
-            struct Hook h = {{NULL, NULL}, (HOOKFUNC) hook_function, NULL, NULL};
+            struct Hook h = {{NULL, NULL}, (HOOKFUNC) processscan_hook_function, NULL, NULL};
 
             Forbid();
 

library/posix/setpriority.c

@@ -0,0 +1,41 @@
+/*
+ * $Id: resource_getpriority.c,v 1.0 2025-04-13 14:37:27 clib4devs Exp $
+*/
+
+#include <sys/resource.h>
+
+#ifndef _STDLIB_HEADERS_H
+#include "stdlib_headers.h"
+#endif /* _STDLIB_HEADERS_H */
+
+int
+setpriority (int which, unsigned int who, int priority) {
+
+    if (priority < PRIO_MIN || priority > PRIO_MAX) {
+        __set_errno(EINVAL);
+        return -1;
+    }
+
+    switch (which) {
+        case PRIO_PROCESS:
+        case PRIO_PGRP:
+        case PRIO_USER: {
+            struct Hook h = {{NULL, NULL}, (HOOKFUNC) processscan_hook_function, NULL, NULL};
+
+            int32 process = ProcessScan(&h, (CONST_APTR) who, 0);
+            if (process > 0) {
+                struct Process *cli_process = (struct Process *) process;
+                SetTaskPri((struct Task *) cli_process, priority);
+                return 0;
+            }
+            else {
+                __set_errno(ESRCH);
+                return -1;
+            }
+            break;
+        }
+        default:
+            __set_errno(EINVAL);
+            return -1;
+    }
+}

library/pthread/sched_get_priority_max.c

@@ -31,9 +31,6 @@
 
 #include "sched.h"
 
-#define PRIO_MAX 2
-#define PRIO_MIN -2
-
 int
 sched_get_priority_max(int policy) {
     (void) (policy);

library/pthread/sched_get_priority_min.c

@@ -31,9 +31,6 @@
 
 #include "sched.h"
 
-#define PRIO_MAX 2
-#define PRIO_MIN -2
-
 int sched_get_priority_min(int policy) {
     (void) (policy);
     return PRIO_MIN;

library/shared_library/clib4_vectors.h

@@ -1187,5 +1187,8 @@ static void *clib4Vectors[] = {
         (void *) (backtrace_symbols_fd),                  /* 4432 */
 		(void *) (dladdr),								  /* 4436 */
 
+        (void *) (getpriority),							  /* 4440 */
+        (void *) (setpriority),							  /* 4444 */
+
         (void *)-1
 };

library/shared_library/interface.h

@@ -1359,6 +1359,9 @@ struct Clib4IFace {
 	void (* backtrace_symbols_fd) (void *const *buffer, int size, int fd);    																		 /* 4432 */
 	int (* dladdr) (const void *addr, Dl_info *info);																								 /* 4436 */
 
+    int (* getpriority) (int which, unsigned int who);																								 /* 4440 */
+    int (* setpriority) (int which, unsigned int who, int priority);																				 /* 4444 */
+
 };
 
 #ifdef __PIC__

library/shared_library/stubs_getpriority.c

@@ -0,0 +1,2 @@
+#include "stubs_common.h"
+Clib4Call(getpriority, 4440);

library/shared_library/stubs_setpriority.c

@@ -0,0 +1,2 @@
+#include "stubs_common.h"
+Clib4Call(setpriority, 4444);

library/stdlib/processscan_hook_function.c

@@ -0,0 +1,19 @@
+/*
+ * $Id: stdlib_processscan_hook_function.c,v 1.0 2025-04-17 08:39:45 clib4devs Exp $
+*/
+
+#ifndef _STDLIB_HEADERS_H
+#include "stdlib_headers.h"
+#endif /* _STDLIB_HEADERS_H */
+
+APTR
+processscan_hook_function(struct Hook *hook, APTR userdata, struct Process *process) {
+    uint32 pid = (uint32) userdata;
+    (void) (hook);
+
+    if (process->pr_ProcessID == pid) {
+        return process;
+    }
+
+    return 0;
+}

library/stdlib/stdlib_headers.h

@@ -119,6 +119,7 @@ extern BOOL arg_init();
 extern void arg_exit();
 
 extern ULONG amigaos_symbols_callback(struct Hook *hook, struct Task *task, struct SymbolMsg *symbolmsg);
+extern APTR processscan_hook_function(struct Hook *hook, APTR userdata, struct Process *process);
 
 #define NAMELEN 32
 

test_programs/misc/priority.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/resource.h>
+#include <unistd.h>
+#include <errno.h>
+
+int
+main(int argc, char *argv[]) {
+    pid_t pid = getpid();  // Get current process ID
+    int which = PRIO_PROCESS;
+    int priority;
+
+    // Get the current priority
+    errno = 0;  // Clear errno before calling getpriority
+    priority = getpriority(which, pid);
+    if (priority == -1 && errno != 0) {
+        perror("getpriority");
+        exit(EXIT_FAILURE);
+    }
+
+    printf("Current priority of process %d: %d\n", pid, priority);
+
+    // Set a new priority (nice value)
+    int new_priority = 10;
+    if (setpriority(which, pid, new_priority) == -1) {
+        perror("setpriority");
+        exit(EXIT_FAILURE);
+    }
+
+    // Confirm the priority was changed
+    errno = 0;
+    priority = getpriority(which, pid);
+    if (priority == -1 && errno != 0) {
+        perror("getpriority");
+        exit(EXIT_FAILURE);
+    }
+
+    printf("New priority of process %d: %d\n", pid, priority);
+
+    return 0;
+}