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[/] [c0or1k/] [trunk/] [conts/] [posix/] [libposix/] [write.c] - Rev 7
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/* * l4/posix glue for write() * * Copyright (C) 2007 Bahadir Balban */ #include <errno.h> #include <stdio.h> #include <sys/types.h> #include <unistd.h> #include <l4lib/ipcdefs.h> #include <libposix.h> static inline int l4_write(int fd, const void *buf, size_t count) { int wrcnt; write_mr(L4SYS_ARG0, fd); write_mr(L4SYS_ARG1, (const unsigned long)buf); write_mr(L4SYS_ARG2, count); /* Call pager with write() request. Check ipc error. */ if ((wrcnt = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_WRITE)) < 0) { print_err("%s: L4 IPC Error: %d.\n", __FUNCTION__, wrcnt); return wrcnt; } /* Check if syscall itself was successful */ if ((wrcnt = l4_get_retval()) < 0) { print_err("%s: WRITE Error: %d.\n", __FUNCTION__, (int)wrcnt); return wrcnt; } return wrcnt; } ssize_t write(int fd, const void *buf, size_t count) { int ret; if (!count) return 0; ret = l4_write(fd, buf, count); /* If error, return positive error code */ if (ret < 0) { errno = -ret; return -1; } /* else return value */ return ret; }
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