define call number

1. Define (that is, host variable)The main role of the host variable is to act as an alternative variable, a medium in which the host environment can interact with Oracle . When you define a host variable by define, you must specify the variable

1, x86 platform 32-bit Linux system call number Location: include/asm-x86/unistd_32.h #define __NR_RESTART_SYSCALL 0 #define __NR_EXIT 1 #define __NR_FORK 2 #define __nr_read 3 #d Efine __nr_write 4 #define __NR_OPEN 5 #define __NR_CLOSE 6 #define _

(1) The system call number is defined in the/usr/include/asm/unistd. h file.(2) 2.6.16 is defined as follows:# Define _ NR_restart_syscall 0# Define _ NR_exit 1# Define _ NR_fork 2# Define _ NR_read 3# Define _ NR_write 4# Define _ NR_open 5# Define

#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not understand the nature of the command in learning,

References:"Linux kernel design and implementation"0 SummarySystem call process for Linux:Levels such as the following:User program------>C library (i.e. API): INT 0x80----->system_call-------> System invoke Service Routines--------> Kernel

Reference:"Linux kernel design and implementation"0 SummarySystem call process for Linux:The hierarchy is as follows:User program------>C library (i.e. API): INT 0x80----->system_call-------> System invoke Service Routines--------> Kernel

#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not understand the nature of the command in learning,

IOS receives a call/call system notification to reach the call/call location effect (1) The implementation principle here is to get the incoming call system notification, and then according to the local call phone number, the corresponding phone

Define is a pre-processing command in C language. It is used for macro definition, which can improve the readability of the source code and provide convenience for programming.Pre-processing commands start with "#", for example, include commands #

Http://blog.sina.com.cn/s/blog_686188ef0100klku.html#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not