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The exec calls named ending with an e alter the environment for the new process image by passing a list of environment settings through the envp argument. This argument is an array of character pointers; each element (except for the final element) points to a null-terminated string defining an environment variable .
A high-level overview of the Linux kernel's system call interface, which handles communication between its various components and the userspace. In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the operating system [a] on which it is executed.
exec (system call), an operating system function for running a program; eval, a programming language function for executing a statement or evaluating an expression, variously called exec or eval; Exec (Amiga), the OS kernel of Amiga computers; CMS EXEC, an interpreted command procedure control language for IBM's VM/CMS operating system
REXX scripts for CMS share the filetype EXEC with EXEC and EXEC2, and the first line of the script specifies the interpreter to be used. REXX scripts for MVS may [a] be recognized by the low level qualifier EXEC or may [b] be recognized by context and the first line. REXX scripts for OS/2 share the filename extension .cmd with other scripting ...
In Unix (and in Unix-like operating systems), the exec() system call is used to perform chain loading. The program image of the current process is replaced with an entirely new image, and the current thread begins execution of that image. The common data area comprises the process' environment variables, which are preserved across the system call.
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kexec (kernel execute), analogous to the Unix/Linux kernel call exec, is a mechanism of the Linux kernel that allows booting of a new kernel from the currently running one. Details [ edit ]