diff --git a/kernel-src/arch/x86-64/syscall.asm b/kernel-src/arch/x86-64/syscall.asm
index 067aba13..5fa0f716 100644
--- a/kernel-src/arch/x86-64/syscall.asm
+++ b/kernel-src/arch/x86-64/syscall.asm
@@ -103,6 +103,7 @@ extern syscall_fstatvfs
 extern syscall_fstatvfsat
 extern syscall_getsockopt
 extern syscall_clock_getres
+extern syscall_setpriority
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -208,7 +209,8 @@ dq syscall_fstatvfs
 dq syscall_fstatvfsat
 dq syscall_getsockopt
 dq syscall_clock_getres
-syscallcount equ 104
+dq syscall_setpriority
+syscallcount equ 105
 section .text
 global arch_syscall_entry
 ; on entry:
diff --git a/kernel-src/arch/x86-64/syscalllog.c b/kernel-src/arch/x86-64/syscalllog.c
index 4a663cdf..70123ddc 100644
--- a/kernel-src/arch/x86-64/syscalllog.c
+++ b/kernel-src/arch/x86-64/syscalllog.c
@@ -9,7 +9,7 @@
 void arch_interrupt_disable();
 void arch_interrupt_enable();
 
-#define SYSCALL_COUNT 104
+#define SYSCALL_COUNT 105
 #define LOGSTR(x) arch_e9_puts(x)
 
 static char *name[] = {
@@ -117,6 +117,7 @@ static char *name[] = {
 	"fstatvfsat",
 	"getsockopt",
 	"clock_getres",
+	"setpriority",
 };
 
 static char *args[] = {
@@ -224,6 +225,7 @@ static char *args[] = {
 	"dirfd %d path %s ustat %p flags %d", // fstatvfsat
 	"fd %d level %d optname %d optval %p optlen %p", // getsockopt
 	"clockid %d timespec %p", // clock_getres
+	"which %d who %d prio %d", // setpriority
 };
 
 #endif
diff --git a/kernel-src/sys/syscalls/setpriority.c b/kernel-src/sys/syscalls/setpriority.c
new file mode 100644
index 00000000..a2147bac
--- /dev/null
+++ b/kernel-src/sys/syscalls/setpriority.c
@@ -0,0 +1,29 @@
+#include <kernel/syscalls.h>
+#include <kernel/thread.h>
+#include <kernel/auth.h>
+#include <arch/cpu.h>
+
+syscallret_t syscall_setpriority(context_t *, int which, int who, int priority) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	if (which != 0) {
+		ret.errno = EINVAL;
+		return ret;
+	}
+
+	if (who) {
+		ret.errno = ESRCH;
+		return ret;
+	}
+
+	ret.errno = priority < current_thread()->proc->nice ? auth_process_check(&current_thread()->proc->cred, AUTH_ACTIONS_PROCESS_NICE, NULL) : 0;
+	if (ret.errno)
+		return ret;
+
+	current_thread()->proc->nice = max(min(priority, SCHED_NICE_MAX), SCHED_NICE_MIN);
+
+	ret.ret = 0;
+	return ret;
+}
diff --git a/patches/mlibc/jinx-working-patch.patch b/patches/mlibc/jinx-working-patch.patch
index cd3f0bce..5196a4fe 100644
--- a/patches/mlibc/jinx-working-patch.patch
+++ b/patches/mlibc/jinx-working-patch.patch
@@ -388,7 +388,7 @@ index ba9a520..b958ef3 100644
  .section .note.GNU-stack,"",%progbits
 -
 diff --git mlibc-clean/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp
-index 3b04372..028fa48 100644
+index 3b04372..e5741d1 100644
 --- mlibc-clean/sysdeps/astral/generic/generic.cpp
 +++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
 @@ -1,7 +1,9 @@
@@ -818,8 +818,20 @@ index 3b04372..028fa48 100644
  	int Sysdeps<Readv>::operator()(int fd, const struct iovec *iovs, int iovc, ssize_t *bytes_read) {
  		long r;
  		int error = syscall(SYSCALL_READV, &r, fd, (uint64_t)iovs, iovc);
-@@ -444,6 +827,12 @@ namespace mlibc {
- 		return ret;
+@@ -86,6 +469,11 @@ namespace mlibc {
+ 		return e;
+ 	}
+ 
++	int Sysdeps<SetPriority>::operator()(int which, id_t who, int prio) {
++		long ret;
++		return syscall(SYSCALL_SETPRIORITY, &ret, which, who, prio);
++	}
++
+ 	int Sysdeps<Shutdown>::operator()(int sockfd, int how) {
+ 		long ret;
+ 		return syscall(SYSCALL_SHUTDOWN, &ret, sockfd, how);
+@@ -487,8 +875,15 @@ namespace mlibc {
+ 		return err;
  	}
  
 +	int Sysdeps<ThreadSetname>::operator()(void *tcb, const char *name) {
@@ -828,18 +840,13 @@ index 3b04372..028fa48 100644
 +		return 0;
 +	}
 +
- 	#ifndef MLIBC_BUILDING_RTLD
- 
- 	[[noreturn]] void Sysdeps<ThreadExit>::operator()() {
-@@ -489,6 +878,7 @@ namespace mlibc {
- 
  	int Sysdeps<SetSockopt>::operator()(int fd, int layer, int number, const void *buffer, socklen_t size) {
  		long ret;
 +		mlibc::infoLogger() << "setsockopt: fd " << fd << " layer " << layer << " number " << number << frg::endlog;
  		return syscall(SYSCALL_SETSOCKOPT, &ret, fd, layer, number, (uint64_t)buffer, size);
  	}
  
-@@ -511,6 +901,11 @@ namespace mlibc {
+@@ -511,6 +906,11 @@ namespace mlibc {
  		return err;
  	}
  
@@ -851,7 +858,7 @@ index 3b04372..028fa48 100644
  	int Sysdeps<Renameat>::operator()(int olddirfd, const char *old_path, int newdirfd, const char *new_path) {
  		long ret;
  		return syscall(SYSCALL_RENAMEAT, &ret, olddirfd, (uint64_t)old_path, newdirfd, (uint64_t)new_path);
-@@ -562,6 +957,16 @@ namespace mlibc {
+@@ -562,6 +962,16 @@ namespace mlibc {
  		return sysdep<Ioctl>(fd, TCSETS, (void *)attr, &res);
  	}
  
@@ -868,7 +875,7 @@ index 3b04372..028fa48 100644
  	int Sysdeps<Poll>::operator()(struct pollfd *fds, nfds_t count, int timeout, int *num_events) {
  		long ret;
  		long error = syscall(SYSCALL_POLL, &ret, (uint64_t)fds, count, timeout);
-@@ -932,4 +1337,13 @@ namespace mlibc {
+@@ -932,4 +1342,13 @@ namespace mlibc {
  		*nanos = ts.tv_nsec;
  		return err;
  	}
@@ -905,10 +912,10 @@ index 7e4f2a1..ecc2677 100644
  #ifdef __cplusplus
  extern "C" {
 diff --git mlibc-clean/sysdeps/astral/include/astral/syscall.h mlibc-workdir/sysdeps/astral/include/astral/syscall.h
-index a6c4067..f1e0b65 100644
+index a6c4067..fd38197 100644
 --- mlibc-clean/sysdeps/astral/include/astral/syscall.h
 +++ mlibc-workdir/sysdeps/astral/include/astral/syscall.h
-@@ -103,6 +103,11 @@
+@@ -103,6 +103,12 @@
  #define SYSCALL_SYSINFO 96
  #define SYSCALL_WRITEV 97
  #define SYSCALL_READV 98
@@ -917,11 +924,12 @@ index a6c4067..f1e0b65 100644
 +#define SYSCALL_FSTATVFSAT 101
 +#define SYSCALL_GETSOCKOPT 102
 +#define SYSCALL_CLOCK_GETRES 103
++#define SYSCALL_SETPRIORITY 104
  
  #ifndef __MLIBC_ABI_ONLY
  
 diff --git mlibc-clean/sysdeps/astral/include/mlibc/sysdeps.hpp mlibc-workdir/sysdeps/astral/include/mlibc/sysdeps.hpp
-index ce91084..5e96961 100644
+index ce91084..0fffdf3 100644
 --- mlibc-clean/sysdeps/astral/include/mlibc/sysdeps.hpp
 +++ mlibc-workdir/sysdeps/astral/include/mlibc/sysdeps.hpp
 @@ -7,8 +7,30 @@ namespace mlibc {
@@ -980,14 +988,17 @@ index ce91084..5e96961 100644
  	Poll,
  	Ppoll,
  	Pselect,
-@@ -135,6 +161,7 @@ struct AstralSysdepTags :
+@@ -135,7 +161,9 @@ struct AstralSysdepTags :
  	VmUnmap,
  	Isatty,
  	ClockGet,
+-	PrepareStack
 +	ClockGetres,
- 	PrepareStack
++	PrepareStack,
++	SetPriority
  {};
  
+ template<typename Tag>
 diff --git mlibc-clean/sysdeps/linux/generic/sysdeps.cpp mlibc-workdir/sysdeps/linux/generic/sysdeps.cpp
 index a07ed53..1474470 100644
 --- mlibc-clean/sysdeps/linux/generic/sysdeps.cpp