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Add os/posix-fork

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Very simple fork function that returns a process object that can be
waited on.
This commit is contained in:
Calvin Rose 2023-10-08 11:09:00 -05:00
parent 8c0d65cf9f
commit 4b8c1ac2d2
1 changed files with 29 additions and 0 deletions
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29
src/core/os.c
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@ -2340,6 +2340,34 @@ JANET_CORE_FN(os_permission_int,
return janet_wrap_integer(os_get_unix_mode(argv, 0)); return janet_wrap_integer(os_get_unix_mode(argv, 0));
} }
JANET_CORE_FN(os_posix_fork,
"(os/posix-fork)",
"Make a `fork` system call and create a new process. Return nil if in the new process, otherwise a core/proc object (as returned by os/spawn). "
"Not supported on all system (POSIX only).") {
janet_sandbox_assert(JANET_SANDBOX_SUBPROCESS);
janet_fixarity(argc, 0);
(void) argv;
#ifdef JANET_WINDOWS
janet_panic("not supported");
#else
pid_t result;
do {
result = fork();
} while (result == -1 && errno == EINTR);
if (result == -1) {
janet_panic(strerror(errno));
}
if (result) {
JanetProc *proc = janet_abstract(&ProcAT, sizeof(JanetProc));
memset(proc, 0, sizeof(JanetProc));
proc->pid = result;
proc->flags = JANET_PROC_ALLOW_ZOMBIE;
return janet_wrap_abstract(proc);
}
return janet_wrap_nil();
#endif
}
#ifdef JANET_EV #ifdef JANET_EV
/* /*
@ -2626,6 +2654,7 @@ void janet_lib_os(JanetTable *env) {
JANET_CORE_REG("os/execute", os_execute), JANET_CORE_REG("os/execute", os_execute),
JANET_CORE_REG("os/spawn", os_spawn), JANET_CORE_REG("os/spawn", os_spawn),
JANET_CORE_REG("os/shell", os_shell), JANET_CORE_REG("os/shell", os_shell),
JANET_CORE_REG("os/posix-fork", os_posix_fork),
/* no need to sandbox process management if you can't create processes /* no need to sandbox process management if you can't create processes
* (allows for limited functionality if use exposes C-functions to create specific processes) */ * (allows for limited functionality if use exposes C-functions to create specific processes) */
JANET_CORE_REG("os/proc-wait", os_proc_wait), JANET_CORE_REG("os/proc-wait", os_proc_wait),