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[/] [c0or1k/] [trunk/] [conts/] [posix/] [libposix/] [fork.c] - Rev 7
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/* * l4/posix glue for fork() * * Copyright (C) 2008 Bahadir Balban */ #include <errno.h> #include <stdio.h> #include <sys/types.h> #include <l4lib/ipcdefs.h> #include <l4lib/utcb.h> #include <l4/macros.h> #include INC_GLUE(memory.h) #include <shpage.h> #include <libposix.h> static inline int l4_fork(void) { int err; /* Call pager with open() request. Check ipc error. */ if ((err = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_FORK)) < 0) { print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, err); return err; } /* Check if syscall itself was successful */ if ((err = l4_get_retval()) < 0) { print_err("%s: OPEN Error: %d.\n", __FUNCTION__, err); return err; } return err; } int fork(void) { int ret = l4_fork(); /* If error, return positive error code */ if (ret < 0) { errno = -ret; return -1; } return ret; } extern int arch_clone(l4id_t to, l4id_t from, unsigned int flags); int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ...) { /* Set up the child stack */ unsigned int *stack = child_stack; int ret; /* First word of new stack is arg */ stack[-1] = (unsigned long)arg; /* Second word of new stack is function address */ stack[-2] = (unsigned long)fn; /* Write the tag */ l4_set_tag(L4_IPC_TAG_CLONE); /* Write the args as in usual ipc */ write_mr(L4SYS_ARG0, (unsigned long)child_stack); write_mr(L4SYS_ARG1, flags); /* Perform an ipc but with different return logic. See implementation. */ if ((ret = arch_clone(pagerid, pagerid, 0)) < 0) { print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, ret); return ret; } if ((ret = l4_get_retval()) < 0) { print_err("%s: CLONE Error: %d.\n", __FUNCTION__, ret); return ret; } return ret; }
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