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#include <sys/epoll.h>
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int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout);
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int epoll_pwait(int epfd, struct epoll_event *events, int maxevents, int timeout, const sigset_t *sigmask);
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typedef union epoll_data {
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    void    *ptr;
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    int      fd;
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    uint32_t u32;
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    uint64_t u64;
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} epoll_data_t;
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struct epoll_event {
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    uint32_t     events;    /* Epoll events */
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    epoll_data_t data;      /* User data variable */
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};
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epoll_pwait(3, [{EPOLLIN, {u32=18, u64=18}}], 1024, 11749, NULL, 8)

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#include <sys/epoll.h>
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int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
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epoll_ctl(3, EPOLL_CTL_ADD, 22, {EPOLLOUT, {u32=22, u64=7575752952099373078}}) // 0
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epoll_ctl(3, EPOLL_CTL_ADD, 25, {EPOLLIN, {u32=25, u64=7575752952099373081}})  // -1 EEXIST (File exists)

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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/socket.h>
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int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags);
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accept4(18, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK)

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#include <unistd.h>
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ssize_t write(int fd, const void *buf, size_t count);
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write(21, "Q\0\0\0\372SELECT \"users\".\"id\" FROM \"u"..., 251)  // 251
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write(26, "HTTP/1.1 200 OK\r\nX-Powered-By: E"..., 30514)         // 30514

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#include <unistd.h>
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ssize_t read(int fd, void *buf, size_t count);
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read(26, "POST /graphql?query=ME HTTP/1"..., 65536)    // 1435

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#include <linux/futex.h>
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#include <sys/time.h>
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int futex(int *uaddr, int op, int val, const struct timespec *timeout,
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          int *uaddr2, int val3);
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futex(0x7f3804ef39a4, FUTEX_WAKE_PRIVATE, 1)        // = 1

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#include <sys/mman.h>
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int mprotect(void *addr, size_t len, int prot);
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mprotect(0x38ae4f980000, 524288, PROT_READ|PROT_WRITE) // = 0

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#include <sys/types.h>
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#include <unistd.h>
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pid_t getpid(void);
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pid_t getppid(void);
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getpid()                        // 122

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#include <sys/mman.h>
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void *mmap(void *addr, size_t lengthint, int prot, int flags,
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           int fd, off_t offset);
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int munmap(void *addr, size_t length);
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// 如果 addr 是 NULL，将会开辟一片空间
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// MAP_PRIVATE: 私有的 copy-on-write 的映射
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// MAP_ANONYMOUS: The mapping is not backed by any file; its contents are initialized to zero.
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mmap(NULL, 286720, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) // 0x7f38076a8000

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#include <unistd.h>
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int brk(void *addr);
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void *sbrk(intptr_t increment);
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brk(NULL)                           // 0x36df000

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#include <unistd.h>
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int execve(const char *filename, char *const argv[], char *const envp[]);
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execve("/usr/bin/node", ["node", "index.js"], [/* 27 vars */]) // = 0