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- <title>system</title>
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- <h2 align=center>system</h2>
- <h4 align=center>OS/161 Reference Manual</h4>
- <h3>Name</h3>
- system - run command as subprocess
- <h3>Library</h3>
- Standard C Library (libc, -lc)
- <h3>Synopsis</h3>
- #include <stdlib.h><br>
- <br>
- int<br>
- system(const char *<em>command</em>);
- <h3>Description</h3>
- The system routine executes <em>command</em> as if it were typed into
- the shell.
- <h3>Return Values</h3>
- On success, system returns the exit status returned from
- <A HREF=../syscall/waitpid.html>waitpid</A>.
- On error, -1 is returned, and <A HREF=../syscall/errno.html>errno</A>
- is set according to the error encountered.
- <h3>Errors</h3>
- Any of the errors from <A HREF=../syscall/fork.html>fork</A> or
- <A HREF=../syscall/waitpid.html>waitpid</A>. Errors generated during
- <A HREF=../syscall/execv.html>execv</A> cannot readily be reported
- back in detail.
- <h3>Restrictions</h3>
- In OS/161 there may be no shell and when there is the shell's behavior
- and syntax is not specified. For this reason we make no assumptions
- about the shell's operation, and assume system() cannot reliably use
- the shell to parse and execute <em>command</em>. system() does this
- itself, in a way which may not necessarily be compatible with the
- shell as it finally appears. You may want to change system() to invoke
- the shell in a suitable fashion when/if a shell is available.
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