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[Linux & Unix -- exec and fock System Call], linux operating system
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Series of blog posts:
Linux and Unix -- file descriptors and permissions
The second bullet
Linux command issues called by Exec, system, and other functions in PHPFirst novel two sentences: Today, the next PHP call the function of the Linux command, the beginning of how to do the call is unsuccessful, tried for a long time to finally
Chapter 5
5.5 Linux system call
5.5.1 System Call Interface
System calls (commonly referred to as syscils) are the only interface for interaction between linux kernels and upper-layer applications. See Figure 5-4. According to the description of
implementation of system call under Linux
Introduction to architecture and system invocation of Unix/linux operating system
what is an operating system and system call
The operating system is a virtual machine that is abstracted from the hardware,
Php provides the system (), exec (), passthru () functions to call external commands.Their differences:System () outputs and returns the last shell result.Exec () does not output results. The last shell result is returned. All results can be saved
start a new process (systemfunction)The system () function can start a new process.int system (const char *string)The effect of this function is equivalent to executing the SH–C string.In general, using the system function is far from the ideal way
PHP executes the system's external command system () exec () passthru (). Difference: system () outputs and returns the last shell result. Exec () does not output results. The last shell result is returned. all results can be saved to a returned
Method 1: # include INT system (const char * string );Method 2: exec () function familyNext let's take a look at how a process can start the execution of another program. Use the exec function family in Linux. The system calls execve () to replace
(1) exec Function Description
The fork function is used to create a child process, which is almost a copy of the parent process. Sometimes we want the child process to execute another program, the exec function family provides a method to start
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