Section 2: system calls
pidfd_open – obtain a file descriptor that refers to a process Synopsis#include <sys/types.h> int pidfd_open(pid_t pid, unsigned int flags);DescriptionThe pidfd_open() system call creates a file descriptor that refers to the process whose PID is specified in pid. The file descriptor is returned as the function result; the close-on-exec flag is set on the file descriptor….
pidfd_getfd – obtain a duplicate of another process’s file descriptor Synopsisint pidfd_getfd(int pidfd, int targetfd, unsigned int flags);DescriptionThe pidfd_getfd() system call allocates a new file descriptor in the calling process. This new file descriptor is a duplicate of an existing file descriptor, targetfd, in the process referred to by the PID file descriptor pidfd. The…
afs_syscall, break, fattach, fdetach, ftime, getmsg, getpmsg, gtty, isastream, lock, madvise1, mpx, prof, profil, putmsg, putpmsg, security, stty, tuxcall, ulimit, vserver – unimplemented system calls SynopsisUnimplemented system calls. DescriptionThese system calls are not implemented in the Linux kernel. Return ValueThese system calls always return -1 and set errno to ENOSYS. NotesNote that ftime(3), profil(3), and…
personality – set the process execution domain Synopsis#include <sys/personality.h> int personality(unsigned long persona); DescriptionLinux supports different execution domains, or personalities, for each process. Among other things, execution domains tell Linux how to map signal numbers into signal actions. The execution domain system allows Linux to provide limited support for binaries compiled under other UNIX-like operating…
perfmonctl – interface to IA-64 performance monitoring unit Synopsis#include <syscall.h> #include <perfmon.h> long perfmonctl(int fd, int cmd, void *arg, int narg);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionThe IA-64-specific perfmonctl() system call provides an interface to the PMU (performance monitoring unit). The PMU consists of PMD (performance monitoring data) registers…
perf_event_open – set up performance monitoring Synopsis#include <linux/perf_event.h> #include <linux/hw_breakpoint.h> int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu, int group_fd, unsigned long flags);Note: There is no glibc wrapper for this system call; see NOTES. DescriptionGiven a list of parameters, perf_event_open() returns a file descriptor, for use in subsequent system calls (read(2), mmap(2), prctl(2), fcntl(2), etc.)….
pciconfig_read, pciconfig_write, pciconfig_iobase – pci device information handling Synopsis#include <pci.h> int pciconfig_read(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf); int pciconfig_write(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf); int pciconfig_iobase(long which, unsigned long bus, unsigned long devfn);DescriptionMost of the interaction with PCI devices…
pciconfig_read, pciconfig_write, pciconfig_iobase – pci device information handling Synopsis#include <pci.h> int pciconfig_read(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf); int pciconfig_write(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf); int pciconfig_iobase(long which, unsigned long bus, unsigned long devfn);DescriptionMost of the interaction with PCI devices…
pciconfig_read, pciconfig_write, pciconfig_iobase – pci device information handling Synopsis#include <pci.h> int pciconfig_read(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf); int pciconfig_write(unsigned long bus, unsigned long dfn, unsigned long off, unsigned long len, void *buf); int pciconfig_iobase(long which, unsigned long bus, unsigned long devfn);DescriptionMost of the interaction with PCI devices…
pause – wait for signal Synopsis#include <unistd.h> int pause(void); Descriptionpause() causes the calling process (or thread) to sleep until a signal is delivered that either terminates the process or causes the invocation of a signal-catching function. Return Valuepause() returns only when a signal was caught and the signal-catching function returned. In this case, pause() returns…
path_resolution – how a pathname is resolved to a file DescriptionSome UNIX/Linux system calls have as parameter one or more filenames. A filename (or pathname) is resolved as follows. Step 1: Start of the resolution processIf the pathname starts with the ‘/’ character, the starting lookup directory is the root directory of the calling process….
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…
outb, outw, outl, outsb, outsw, outsl, inb, inw, inl, insb, insw, insl, outb_p, outw_p, outl_p, inb_p, inw_p, inl_p – port I/O Synopsis#include <sys/io.h> unsigned char inb(unsigned short port); unsigned char inb_p(unsigned short port); unsigned short inw(unsigned short port); unsigned short inw_p(unsigned short port); unsigned int inl(unsigned short port); unsigned int inl_p(unsigned short port); void outb(unsigned…