uplime/shellfish
uplime
/
shellfish
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Clarify why the child process is useful

This commit is contained in:
Nick Chambers 2024-03-04 12:44:22 -06:00
parent fb132a4f0f
commit 1f4326fd68
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
exec.c
View File

@ -14,10 +14,13 @@ int main() {
// When the child process returns from `fork`, the value assigned to `pid`
// will be 0. In the parent process, `pid` will be the process ID (a non-0
// number) of the child process.
// number) of the child process. It is important to note that the process ID
// of the child isn't actually 0. The call to `fork` only returns 0 to
// allow code to determine if it is the child.
if(pid == 0) {
// This call to `exec` will only be run by the child process. This is
// because `exec` replaces the process' instructions with the instructions
// Since this block only executes if `pid` is 0, the call to `execvp` will
// only be run by the child process. This is done because the `exec` family
// of functions replace the process' instructions with the instructions
// found in `cmdline[0]` (in this case, `echo`). The `v` in `execvp` means
// vector, which in this case refers to the array `cmdline`. The `p` means
// path, indicating that it will search all of the directories found in the