about fork and execve system call

Question

It is said that fork system call creates a clone of the calling process, and then (usually) the child process issues execve system call to change its i

Answer 1

What does execve stand for?

The 6 variations of the exec functions in C are are exec{l,v}{,e,p}. See function prototypes below for details.

Command-line arguments

• v - Command-line arguments are passed to the function as an array (vector) of pointers.
• l - Command-line arguments are passed individually (a list) to the function.

Environment variables (optional)

• e - An array of pointers to environment variables is explicitly passed to the new process image

Locate the file to be executed (optional)

• p - Uses the PATH environment variable to find the file named in the file argument to be executed

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int execl (char const *path, char const *arg0, ...);
int execle(char const *path, char const *arg0, ..., char const *envp[]);
int execlp(char const *file, char const *arg0, ...);
int execv (char const *path, char const *argv[]);
int execve(char const *path, char const *argv[], char const *envp[]);
int execvp(char const *file, char const *argv[]);

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