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mariadb

Posted by 夏泽民 Sep 19, 2019

https://mariadb.com/kb/zh-cn/mariadb-mariadbmysql/ MariaDB的目的是完全兼容MySQL，包括API和命令行，使之能轻松成为MySQL的代替品。

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system call table

Posted by 夏泽民 Sep 18, 2019

系统调用号 函数名 入口点 源代码 0 read sys_read fs/read_write.c 1 write sys_write fs/read_write.c 2 open sys_open fs/open.c 3 close sys_close fs/open.c 4 stat sys_newstat fs/stat.c 5 fstat sys_newfstat fs/stat.c 6 lstat sys_newlstat fs/stat.c 7 poll sys_poll fs/select.c 8 lseek sys_lseek fs/read_write.c 9 mmap sys_mmap arch/x86/kernel/sys_x86_64.c 10 mprotect sys_mprotect mm/mprotect.c 11 munmap sys_munmap mm/mmap.c 12 brk sys_brk mm/mmap.c 13 rt_sigaction sys_rt_sigaction kernel/signal.c 14 rt_sigprocmask sys_rt_sigprocmask kernel/signal.c 15 rt_sigreturn stub_rt_sigreturn arch/x86/kernel/signal.c 16 ioctl sys_ioctl fs/ioctl.c 17 pread64 sys_pread64 fs/read_write.c 18 pwrite64 sys_pwrite64 fs/read_write.c 19 readv sys_readv fs/read_write.c 20 writev sys_writev fs/read_write.c 21 access sys_access fs/open.c 22 pipe sys_pipe fs/pipe.c 23 select sys_select fs/select.c 24 sched_yield sys_sched_yield kernel/sched/core.c 25 mremap sys_mremap mm/mmap.c 26 msync sys_msync mm/msync.c 27 mincore sys_mincore mm/mincore.c 28 madvise sys_madvise mm/madvise.c 29 shmget sys_shmget ipc/shm.c 30 shmat sys_shmat ipc/shm.c 31 shmctl sys_shmctl ipc/shm.c 32 dup sys_dup fs/file.c 33 dup2 sys_dup2 fs/file.c 34 pause sys_pause kernel/signal.c 35 nanosleep sys_nanosleep kernel/hrtimer.c 36 getitimer sys_getitimer kernel/itimer.c 37 alarm sys_alarm kernel/timer.c 38 setitimer sys_setitimer kernel/itimer.c 39 getpid sys_getpid kernel/sys.c 40 sendfile sys_sendfile64 fs/read_write.c 41 socket sys_socket net/socket.c 42 connect sys_connect net/socket.c 43 accept sys_accept net/socket.c 44 sendto sys_sendto net/socket.c 45 recvfrom sys_recvfrom net/socket.c 46 sendmsg sys_sendmsg net/socket.c 47 recvmsg sys_recvmsg net/socket.c 48 shutdown sys_shutdown net/socket.c 49 bind sys_bind net/socket.c 50 listen sys_listen net/socket.c 51 getsockname sys_getsockname net/socket.c 52 getpeername sys_getpeername net/socket.c 53 socketpair sys_socketpair net/socket.c 54 setsockopt sys_setsockopt net/socket.c 55 getsockopt sys_getsockopt net/socket.c 56 clone stub_clone kernel/fork.c 57 fork stub_fork kernel/fork.c 58 vfork stub_vfork kernel/fork.c 59 execve stub_execve fs/exec.c 60 exit sys_exit kernel/exit.c 61 wait4 sys_wait4 kernel/exit.c 62 kill sys_kill kernel/signal.c 63 uname sys_newuname kernel/sys.c 64 semget sys_semget ipc/sem.c 65 semop sys_semop ipc/sem.c 66 semctl sys_semctl ipc/sem.c 67 shmdt sys_shmdt ipc/shm.c 68 msgget sys_msgget ipc/msg.c 69 msgsnd sys_msgsnd ipc/msg.c 70 msgrcv sys_msgrcv ipc/msg.c 71 msgctl sys_msgctl ipc/msg.c 72 fcntl sys_fcntl fs/fcntl.c 73 flock sys_flock fs/locks.c 74 fsync sys_fsync fs/sync.c 75 fdatasync sys_fdatasync fs/sync.c 76 truncate sys_truncate fs/open.c 77 ftruncate sys_ftruncate fs/open.c 78 getdents sys_getdents fs/readdir.c 79 getcwd sys_getcwd fs/dcache.c 80 chdir sys_chdir fs/open.c 81 fchdir sys_fchdir fs/open.c 82 rename sys_rename fs/namei.c 83 mkdir sys_mkdir fs/namei.c 84 rmdir sys_rmdir fs/namei.c 85 creat sys_creat fs/open.c 86 link sys_link fs/namei.c 87 unlink sys_unlink fs/namei.c 88 symlink sys_symlink fs/namei.c 89 readlink sys_readlink fs/stat.c 90 chmod sys_chmod fs/open.c 91 fchmod sys_fchmod fs/open.c 92 chown sys_chown fs/open.c 93 fchown sys_fchown fs/open.c 94 lchown sys_lchown fs/open.c 95 umask sys_umask kernel/sys.c 96 gettimeofday sys_gettimeofday kernel/time.c 97 getrlimit sys_getrlimit kernel/sys.c 98 getrusage sys_getrusage kernel/sys.c 99 sysinfo sys_sysinfo kernel/sys.c 100 times sys_times kernel/sys.c 101 ptrace sys_ptrace kernel/ptrace.c 102 getuid sys_getuid kernel/sys.c 103 syslog sys_syslog kernel/printk/printk.c 104 getgid sys_getgid kernel/sys.c 105 setuid sys_setuid kernel/sys.c 106 setgid sys_setgid kernel/sys.c 107 geteuid sys_geteuid kernel/sys.c 108 getegid sys_getegid kernel/sys.c 109 setpgid sys_setpgid kernel/sys.c 110 getppid sys_getppid kernel/sys.c 111 getpgrp sys_getpgrp kernel/sys.c 112 setsid sys_setsid kernel/sys.c 113 setreuid sys_setreuid kernel/sys.c 114 setregid sys_setregid kernel/sys.c 115 getgroups sys_getgroups kernel/groups.c 116 setgroups sys_setgroups kernel/groups.c 117 setresuid sys_setresuid kernel/sys.c 118 getresuid sys_getresuid kernel/sys.c 119 setresgid sys_setresgid kernel/sys.c 120 getresgid sys_getresgid kernel/sys.c 121 getpgid sys_getpgid kernel/sys.c 122 setfsuid sys_setfsuid kernel/sys.c 123 setfsgid sys_setfsgid kernel/sys.c 124 getsid sys_getsid kernel/sys.c 125 capget sys_capget kernel/capability.c 126 capset sys_capset kernel/capability.c 127 rt_sigpending sys_rt_sigpending kernel/signal.c 128 rt_sigtimedwait sys_rt_sigtimedwait kernel/signal.c 129 rt_sigqueueinfo sys_rt_sigqueueinfo kernel/signal.c 130 rt_sigsuspend sys_rt_sigsuspend kernel/signal.c 131 sigaltstack sys_sigaltstack kernel/signal.c 132 utime sys_utime fs/utimes.c 133 mknod sys_mknod fs/namei.c 134 uselib   fs/exec.c 135 personality sys_personality kernel/exec_domain.c 136 ustat sys_ustat fs/statfs.c 137 statfs sys_statfs fs/statfs.c 138 fstatfs sys_fstatfs fs/statfs.c 139 sysfs sys_sysfs fs/filesystems.c 140 getpriority sys_getpriority kernel/sys.c 141 setpriority sys_setpriority kernel/sys.c 142 sched_setparam sys_sched_setparam kernel/sched/core.c 143 sched_getparam sys_sched_getparam kernel/sched/core.c 144 sched_setscheduler sys_sched_setscheduler kernel/sched/core.c 145 sched_getscheduler sys_sched_getscheduler kernel/sched/core.c 146 sched_get_priority_max sys_sched_get_priority_max kernel/sched/core.c 147 sched_get_priority_min sys_sched_get_priority_min kernel/sched/core.c 148 sched_rr_get_interval sys_sched_rr_get_interval kernel/sched/core.c 149 mlock sys_mlock mm/mlock.c 150 munlock sys_munlock mm/mlock.c 151 mlockall sys_mlockall mm/mlock.c 152 munlockall sys_munlockall mm/mlock.c 153 vhangup sys_vhangup fs/open.c 154 modify_ldt sys_modify_ldt arch/x86/um/ldt.c 155 pivot_root sys_pivot_root fs/namespace.c 156 _sysctl sys_sysctl kernel/sysctl_binary.c 157 prctl sys_prctl kernel/sys.c 158 arch_prctl sys_arch_prctl arch/x86/um/syscalls_64.c 159 adjtimex sys_adjtimex kernel/time.c 160 setrlimit sys_setrlimit kernel/sys.c 161 chroot sys_chroot fs/open.c 162 sync sys_sync fs/sync.c 163 acct sys_acct kernel/acct.c 164 settimeofday sys_settimeofday kernel/time.c 165 mount sys_mount fs/namespace.c 166 umount2 sys_umount fs/namespace.c 167 swapon sys_swapon mm/swapfile.c 168 swapoff sys_swapoff mm/swapfile.c 169 reboot sys_reboot kernel/reboot.c 170 sethostname sys_sethostname kernel/sys.c 171 setdomainname sys_setdomainname kernel/sys.c 172 iopl stub_iopl arch/x86/kernel/ioport.c 173 ioperm sys_ioperm arch/x86/kernel/ioport.c 174 create_module   NOT IMPLEMENTED 175 init_module sys_init_module kernel/module.c 176 delete_module sys_delete_module kernel/module.c 177 get_kernel_syms   NOT IMPLEMENTED 178 query_module   NOT IMPLEMENTED 179 quotactl sys_quotactl fs/quota/quota.c 180 nfsservctl   NOT IMPLEMENTED 181 getpmsg   NOT IMPLEMENTED 182 putpmsg   NOT IMPLEMENTED 183 afs_syscall   NOT IMPLEMENTED 184 tuxcall   NOT IMPLEMENTED 185 security   NOT IMPLEMENTED 186 gettid sys_gettid kernel/sys.c 187 readahead sys_readahead mm/readahead.c 188 setxattr sys_setxattr fs/xattr.c 189 lsetxattr sys_lsetxattr fs/xattr.c 190 fsetxattr sys_fsetxattr fs/xattr.c 191 getxattr sys_getxattr fs/xattr.c 192 lgetxattr sys_lgetxattr fs/xattr.c 193 fgetxattr sys_fgetxattr fs/xattr.c 194 listxattr sys_listxattr fs/xattr.c 195 llistxattr sys_llistxattr fs/xattr.c 196 flistxattr sys_flistxattr fs/xattr.c 197 removexattr sys_removexattr fs/xattr.c 198 lremovexattr sys_lremovexattr fs/xattr.c 199 fremovexattr sys_fremovexattr fs/xattr.c 200 tkill sys_tkill kernel/signal.c 201 time sys_time kernel/time.c 202 futex sys_futex kernel/futex.c 203 sched_setaffinity sys_sched_setaffinity kernel/sched/core.c 204 sched_getaffinity sys_sched_getaffinity kernel/sched/core.c 205 set_thread_area   arch/x86/kernel/tls.c 206 io_setup sys_io_setup fs/aio.c 207 io_destroy sys_io_destroy fs/aio.c 208 io_getevents sys_io_getevents fs/aio.c 209 io_submit sys_io_submit fs/aio.c 210 io_cancel sys_io_cancel fs/aio.c 211 get_thread_area   arch/x86/kernel/tls.c 212 lookup_dcookie sys_lookup_dcookie fs/dcookies.c 213 epoll_create sys_epoll_create fs/eventpoll.c 214 epoll_ctl_old   NOT IMPLEMENTED 215 epoll_wait_old   NOT IMPLEMENTED 216 remap_file_pages sys_remap_file_pages mm/fremap.c 217 getdents64 sys_getdents64 fs/readdir.c 218 set_tid_address sys_set_tid_address kernel/fork.c 219 restart_syscall sys_restart_syscall kernel/signal.c 220 semtimedop sys_semtimedop ipc/sem.c 221 fadvise64 sys_fadvise64 mm/fadvise.c 222 timer_create sys_timer_create kernel/posix-timers.c 223 timer_settime sys_timer_settime kernel/posix-timers.c 224 timer_gettime sys_timer_gettime kernel/posix-timers.c 225 timer_getoverrun sys_timer_getoverrun kernel/posix-timers.c 226 timer_delete sys_timer_delete kernel/posix-timers.c 227 clock_settime sys_clock_settime kernel/posix-timers.c 228 clock_gettime sys_clock_gettime kernel/posix-timers.c 229 clock_getres sys_clock_getres kernel/posix-timers.c 230 clock_nanosleep sys_clock_nanosleep kernel/posix-timers.c 231 exit_group sys_exit_group kernel/exit.c 232 epoll_wait sys_epoll_wait fs/eventpoll.c 233 epoll_ctl sys_epoll_ctl fs/eventpoll.c 234 tgkill sys_tgkill kernel/signal.c 235 utimes sys_utimes fs/utimes.c 236 vserver   NOT IMPLEMENTED 237 mbind sys_mbind mm/mempolicy.c 238 set_mempolicy sys_set_mempolicy mm/mempolicy.c 239 get_mempolicy sys_get_mempolicy mm/mempolicy.c 240 mq_open sys_mq_open ipc/mqueue.c 241 mq_unlink sys_mq_unlink ipc/mqueue.c 242 mq_timedsend sys_mq_timedsend ipc/mqueue.c 243 mq_timedreceive sys_mq_timedreceive ipc/mqueue.c 244 mq_notify sys_mq_notify ipc/mqueue.c 245 mq_getsetattr sys_mq_getsetattr ipc/mqueue.c 246 kexec_load sys_kexec_load kernel/kexec.c 247 waitid sys_waitid kernel/exit.c 248 add_key sys_add_key security/keys/keyctl.c 249 request_key sys_request_key security/keys/keyctl.c 250 keyctl sys_keyctl security/keys/keyctl.c 251 ioprio_set sys_ioprio_set fs/ioprio.c 252 ioprio_get sys_ioprio_get fs/ioprio.c 253 inotify_init sys_inotify_init fs/notify/inotify/inotify_user.c 254 inotify_add_watch sys_inotify_add_watch fs/notify/inotify/inotify_user.c 255 inotify_rm_watch sys_inotify_rm_watch fs/notify/inotify/inotify_user.c 256 migrate_pages sys_migrate_pages mm/mempolicy.c 257 openat sys_openat fs/open.c 258 mkdirat sys_mkdirat fs/namei.c 259 mknodat sys_mknodat fs/namei.c 260 fchownat sys_fchownat fs/open.c 261 futimesat sys_futimesat fs/utimes.c 262 newfstatat sys_newfstatat fs/stat.c 263 unlinkat sys_unlinkat fs/namei.c 264 renameat sys_renameat fs/namei.c 265 linkat sys_linkat fs/namei.c 266 symlinkat sys_symlinkat fs/namei.c 267 readlinkat sys_readlinkat fs/stat.c 268 fchmodat sys_fchmodat fs/open.c 269 faccessat sys_faccessat fs/open.c 270 pselect6 sys_pselect6 fs/select.c 271 ppoll sys_ppoll fs/select.c 272 unshare sys_unshare kernel/fork.c 273 set_robust_list sys_set_robust_list kernel/futex.c 274 get_robust_list sys_get_robust_list kernel/futex.c 275 splice sys_splice fs/splice.c 276 tee sys_tee fs/splice.c 277 sync_file_range sys_sync_file_range fs/sync.c 278 vmsplice sys_vmsplice fs/splice.c 279 move_pages sys_move_pages mm/migrate.c 280 utimensat sys_utimensat fs/utimes.c 281 epoll_pwait sys_epoll_pwait fs/eventpoll.c 282 signalfd sys_signalfd fs/signalfd.c 283 timerfd_create sys_timerfd_create fs/timerfd.c 284 eventfd sys_eventfd fs/eventfd.c 285 fallocate sys_fallocate fs/open.c 286 timerfd_settime sys_timerfd_settime fs/timerfd.c 287 timerfd_gettime sys_timerfd_gettime fs/timerfd.c 288 accept4 sys_accept4 net/socket.c 289 signalfd4 sys_signalfd4 fs/signalfd.c 290 eventfd2 sys_eventfd2 fs/eventfd.c 291 epoll_create1 sys_epoll_create1 fs/eventpoll.c 292 dup3 sys_dup3 fs/file.c 293 pipe2 sys_pipe2 fs/pipe.c 294 inotify_init1 sys_inotify_init1 fs/notify/inotify/inotify_user.c 295 preadv sys_preadv fs/read_write.c 296 pwritev sys_pwritev fs/read_write.c 297 rt_tgsigqueueinfo sys_rt_tgsigqueueinfo kernel/signal.c 298 perf_event_open sys_perf_event_open kernel/events/core.c 299 recvmmsg sys_recvmmsg net/socket.c 300 fanotify_init sys_fanotify_init fs/notify/fanotify/fanotify_user.c 301 fanotify_mark sys_fanotify_mark fs/notify/fanotify/fanotify_user.c 302 prlimit64 sys_prlimit64 kernel/sys.c 303 name_to_handle_at sys_name_to_handle_at fs/fhandle.c 304 open_by_handle_at sys_open_by_handle_at fs/fhandle.c 305 clock_adjtime sys_clock_adjtime kernel/posix-timers.c 306 syncfs sys_syncfs fs/sync.c 307 sendmmsg sys_sendmmsg net/socket.c 308 setns sys_setns kernel/nsproxy.c 309 getcpu sys_getcpu kernel/sys.c 310 process_vm_readv sys_process_vm_readv mm/process_vm_access.c 311 process_vm_writev sys_process_vm_writev mm/process_vm_access.c 312 kcmp sys_kcmp kernel/kcmp.c 313 finit_module sys_finit_module kernel/module.c 在linux 查看32位的系统调用号 cat /usr/include/asm/unistd_32.h

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函数调用帧栈

Posted by 夏泽民 Sep 18, 2019

区域 作用 栈区（stack） 由编译器自动分配和释放，存放函数的参数值，局部变量的值等。操作方式类似与数据结构中的栈 堆区（heap） 一般由程序员分配和释放，若程序员不释放，程序结束时可能由操作系统回收。与数据结构中的堆是两码事，分配方式类似于链表 静态区（static） 全局变量和静态变量存放于此 文字常量区 常量字符串放在此，程序结束后由系统释放 程序代码区 存放函数体的二进制代码 栈帧就是一个函数执行的环境。实际上，栈帧可以简单理解为：栈帧就是存储在用户栈上的（当然内核栈同样适用）每一次函数调用涉及的相关信息的记录单元。 栈是从高地址向低地址延伸的。每个函数的每次调用，都有它自己独立的一个栈帧，这个栈帧中维持着所需要的各种信息。寄存器ebp指向当前的栈帧的底部（高地址），寄存器esp指向当前的栈帧的顶部（地址地）。

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C语言的异常机制 setjump longjump函数

Posted by 夏泽民 Sep 18, 2019

与刺激的abort()和exit()相比,goto语句看起来是处理异常的更可行方案。不幸的是，goto是本地的：它只能跳到所在函数内部的标号上，而不能将控制权转移到所在程序的任意地点（当然，除非你的所有代码都在main体中）。 为了解决这个限制，C函数库提供了setjmp()和longjmp()函数，它们分别承担非局部标号和goto作用。头文件申明了这些函数及同时所需的jmp_buf数据类型。 原理非常简单： 1.setjmp(j)设置“jump”点，用正确的程序上下文填充jmp_buf对象j。这个上下文包括程序存放位置、栈和框架指针，其它重要的寄存器和内存数据。当初始化完jump的上下文，setjmp()返回0值。

  1. 以后调用longjmp(j,r)的效果就是一个非局部的goto或“长跳转”到由j描述的上下文处（也就是到那原来设置j的setjmp()处）。当作为长跳转的目标而被调用时，setjmp()返回r或1（如果r设为0的话）。（记住，setjmp()不能在这种情况时返回0。）
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rtld_fini

Posted by 夏泽民 Sep 18, 2019

C/C++程序员在写程序时，总是默认程序是从main函数开始的，我们会认为这理所当然，但事实上，当程序在执行到main函数时，很多事情已经完成了。我们可以看看一下几个例子：

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