The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
sched_setaffinity, sched_getaffinity – set and get a thread’s CPU affinity mask Synopsis#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <sched.h> int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *mask); int sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *mask);DescriptionA thread’s CPU affinity mask determines the set of CPUs on which it is eligible to run. On a multiprocessor system, setting…
sched_rr_get_interval – get the SCHED_RR interval for the named process Synopsis#include <sched.h> int sched_rr_get_interval(pid_t pid, struct timespec *tp); Descriptionsched_rr_get_interval() writes into the timespec structure pointed to by tp the round-robin time quantum for the process identified by pid. The specified process should be running under the SCHED_RR scheduling policy. The timespec structure has the following…
sched_setscheduler, sched_getscheduler – set and get scheduling policy/parameters Synopsis#include <sched.h> int sched_setscheduler(pid_t pid, int policy, const struct sched_param *param); int sched_getscheduler(pid_t pid);DescriptionThe sched_setscheduler() system call sets both the scheduling policy and parameters for the thread whose ID is specified in pid. If pid equals zero, the scheduling policy and parameters of the calling thread will…
sched_setparam, sched_getparam – set and get scheduling parameters Synopsis#include <sched.h> int sched_setparam(pid_t pid, const struct sched_param *param); int sched_getparam(pid_t pid, struct sched_param *param); struct sched_param { … int sched_priority; … }; Descriptionsched_setparam() sets the scheduling parameters associated with the scheduling policy for the thread whose thread ID is specified in pid. If pid is zero,…
sched_setattr, sched_getattr – set and get scheduling policy and attributes Synopsis#include <sched.h> int sched_setattr(pid_t pid, struct sched_attr *attr, unsigned int flags); int sched_getattr(pid_t pid, struct sched_attr *attr, unsigned int size, unsigned int flags);Descriptionsched_setattr()The sched_setattr() system call sets the scheduling policy and associated attributes for the thread whose ID is specified in pid. If pid equals…
sched_setaffinity, sched_getaffinity – set and get a thread’s CPU affinity mask Synopsis#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <sched.h> int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *mask); int sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *mask);DescriptionA thread’s CPU affinity mask determines the set of CPUs on which it is eligible to run. On a multiprocessor system, setting…
sched_get_priority_max, sched_get_priority_min – get static priority range Synopsis#include <sched.h> int sched_get_priority_max(int policy); int sched_get_priority_min(int policy); Descriptionsched_get_priority_max() returns the maximum priority value that can be used with the scheduling algorithm identified by policy. sched_get_priority_min() returns the minimum priority value that can be used with the scheduling algorithm identified by policy. Supported policy values are SCHED_FIFO, SCHED_RR,…
sched_get_priority_max, sched_get_priority_min – get static priority range Synopsis#include <sched.h> int sched_get_priority_max(int policy); int sched_get_priority_min(int policy); Descriptionsched_get_priority_max() returns the maximum priority value that can be used with the scheduling algorithm identified by policy. sched_get_priority_min() returns the minimum priority value that can be used with the scheduling algorithm identified by policy. Supported policy values are SCHED_FIFO, SCHED_RR,…
brk, sbrk – change data segment size Synopsis#include <unistd.h> int brk(void *addr); void *sbrk(intptr_t increment); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): brk(), sbrk(): Since glibc 2.19: _DEFAULT_SOURCE || (_XOPEN_SOURCE >= 500) && ! (_POSIX_C_SOURCE >= 200112L)From glibc 2.12 to 2.19: _BSD_SOURCE || _SVID_SOURCE || (_XOPEN_SOURCE >= 500) && ! (_POSIX_C_SOURCE >= 200112L)Before glibc 2.12: _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500Descriptionbrk() and sbrk()…
s390_sthyi – emulate STHYI instruction Synopsis#include <asm/unistd.h> int s390_sthyi(unsigned long function_code, void *resp_buffer, uint64_t *return_code, unsigned long flags);DescriptionThe s390_sthyi() system call emulates the STHYI (Store Hypervisor Information) instruction. It provides hardware resource information for the machine and its virtualization levels. This includes CPU type and capacity, as well as the machine model and other metrics….
s390_runtime_instr – enable/disable s390 CPU run-time instrumentation Synopsis#include <asm/runtime_instr.h> int s390_runtime_instr(int command, int signum);DescriptionThe s390_runtime_instr() system call starts or stops CPU run-time instrumentation for the calling thread. The command argument controls whether run-time instrumentation is started (S390_RUNTIME_INSTR_START, 1) or stopped (S390_RUNTIME_INSTR_STOP, 2) for the calling thread. The signum argument specifies the number of a real-time…
s390_pci_mmio_write, s390_pci_mmio_read – transfer data to/from PCI MMIO memory page Synopsis#include <asm/unistd.h> int s390_pci_mmio_write(unsigned long mmio_addr, void *user_buffer, size_t length); int s390_pci_mmio_read(unsigned long mmio_addr, void *user_buffer, size_t length);DescriptionThe s390_pci_mmio_write() system call writes length bytes of data from the user-space buffer user_buffer to the PCI MMIO memory location specified by mmio_addr. The s390_pci_mmio_read() system call reads…
s390_pci_mmio_write, s390_pci_mmio_read – transfer data to/from PCI MMIO memory page Synopsis#include <asm/unistd.h> int s390_pci_mmio_write(unsigned long mmio_addr, void *user_buffer, size_t length); int s390_pci_mmio_read(unsigned long mmio_addr, void *user_buffer, size_t length);DescriptionThe s390_pci_mmio_write() system call writes length bytes of data from the user-space buffer user_buffer to the PCI MMIO memory location specified by mmio_addr. The s390_pci_mmio_read() system call reads…
s390_guarded_storage – operations with z/Architecture guarded storage facility Synopsis#include <asm/guarded_storage.h> int s390_guarded_storage(int command, struct gs_cb *gs_cb);DescriptionThe s390_guarded_storage() system call enables the use of the Guarded Storage Facility (a z/Architecture-specific feature) for user-space processes. The guarded storage facility is a hardware feature that allows marking up to 64 memory regions (as of z14) as guarded; reading…
rtas – Allows userspace to call RTAS (Run Time Abstraction Services) Synopsisint ppc_rtas (struct rtas_args *uargs); Descriptionppc_rtas enables userspace manipulation of the RunTime Abstraction Services (RTAS). RTAS provides for a portable method of access and setting system information. For example, you could gather information on various system sensors and set poweron values. RTAS is accessed via the /proc…
rt_sigqueueinfo, rt_tgsigqueueinfo – queue a signal and data Synopsisint rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info); int rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *info);Note: There are no glibc wrappers for these system calls; see NOTES. DescriptionThe rt_sigqueueinfo() and rt_tgsigqueueinfo() system calls are the low-level interfaces used to send a signal plus data to a process…
sigwaitinfo, sigtimedwait, rt_sigtimedwait – synchronously wait for queued signals Synopsis#include <signal.h> int sigwaitinfo(const sigset_t *set, siginfo_t *info); int sigtimedwait(const sigset_t *set, siginfo_t *info, const struct timespec *timeout);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigwaitinfo(), sigtimedwait(): _POSIX_C_SOURCE >= 199309L Descriptionsigwaitinfo() suspends execution of the calling thread until one of the signals in set is pending (If one…
sigsuspend, rt_sigsuspend – wait for a signal Synopsis#include <signal.h> int sigsuspend(const sigset_t *mask); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): sigsuspend(): _POSIX_C_SOURCE Descriptionsigsuspend() temporarily replaces the signal mask of the calling thread with the mask given by mask and then suspends the thread until delivery of a signal whose action is to invoke a…
sigreturn, rt_sigreturn – return from signal handler and cleanup stack frame Synopsisint sigreturn(…); DescriptionIf the Linux kernel determines that an unblocked signal is pending for a process, then, at the next transition back to user mode in that process (e.g., upon return from a system call or when the process is rescheduled onto the CPU),…
rt_sigqueueinfo, rt_tgsigqueueinfo – queue a signal and data Synopsisint rt_sigqueueinfo(pid_t tgid, int sig, siginfo_t *info); int rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *info);Note: There are no glibc wrappers for these system calls; see NOTES. DescriptionThe rt_sigqueueinfo() and rt_tgsigqueueinfo() system calls are the low-level interfaces used to send a signal plus data to a process…