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I've been reading its man page but haven't yet been successful in figuring out how it works. On calling system(), is a new child process forked and the shell binary exec()-ed in it? That may be a stupid guess though.
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system() executes a command specified in command by calling /bin/sh -c command, and returns after the command has been completed. During execution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT will be ignored.
In the C Programming Language, the system function allows a C program to run another program by passing a command line (pointed to by string) to the operating system's command processor that will then be executed.
System() Function in C/C++It is used to pass the commands that can be executed in the command processor or the terminal of the operating system, and finally returns the command after it has been completed. <stdlib. h> or <cstdlib> should be included to call this function.
On any POSIX OS (including Linux), the shell used by std::system is /bin/sh .
Yes, system() is essentially a fork() and exec() "sh -c" for the passed command string. An example implementation (from eglibc, recently forked from glibc) can be found here.
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Yes, system("foo bar") is equivalent to execv("/bin/sh", ["sh", "-c", "foo bar"]).
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