mirror of
https://github.com/drasko/codezero.git
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cb561ab262
Added UTCB functions for full ipc that copy buffer or string payloads in secondary message registers. Some posix syscalls now use these utcb functions to copy pathnames.
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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* l4/posix glue for fork()
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*
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* Copyright (C) 2008 Bahadir Balban
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <l4lib/arch/syscalls.h>
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#include <l4lib/arch/syslib.h>
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#include <l4lib/ipcdefs.h>
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#include <l4lib/utcb.h>
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#include <l4/macros.h>
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#include INC_GLUE(memory.h)
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#include <shpage.h>
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#include <libposix.h>
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static inline int l4_fork(void)
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{
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int err;
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/* Call pager with open() request. Check ipc error. */
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if ((err = l4_sendrecv(PAGER_TID, PAGER_TID, L4_IPC_TAG_FORK)) < 0) {
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print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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/* Check if syscall itself was successful */
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if ((err = l4_get_retval()) < 0) {
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print_err("%s: OPEN Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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return err;
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}
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int fork(void)
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{
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int ret = l4_fork();
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/* If error, return positive error code */
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if (ret < 0) {
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errno = -ret;
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return -1;
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}
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return ret;
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}
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extern int arch_clone(l4id_t to, l4id_t from, unsigned int flags);
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int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...)
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{
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/* Set up the child stack */
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unsigned int *stack = child_stack;
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int ret;
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/* First word of new stack is arg */
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stack[-1] = (unsigned long)arg;
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/* Second word of new stack is function address */
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stack[-2] = (unsigned long)fn;
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/* Write the tag */
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l4_set_tag(L4_IPC_TAG_CLONE);
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/* Write the args as in usual ipc */
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write_mr(L4SYS_ARG0, (unsigned long)child_stack);
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write_mr(L4SYS_ARG1, flags);
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/* Perform an ipc but with different return logic. See implementation. */
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if ((ret = arch_clone(PAGER_TID, PAGER_TID, 0)) < 0) {
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print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, ret);
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return ret;
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}
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if ((ret = l4_get_retval()) < 0) {
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print_err("%s: CLONE Error: %d.\n", __FUNCTION__, ret);
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return ret;
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}
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return ret;
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}
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