diff options
Diffstat (limited to 'libc/sysdeps/linux/common/sendfile.c')
| -rw-r--r-- | libc/sysdeps/linux/common/sendfile.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/common/sendfile.c b/libc/sysdeps/linux/common/sendfile.c index 64c200eb2..2bd717929 100644 --- a/libc/sysdeps/linux/common/sendfile.c +++ b/libc/sysdeps/linux/common/sendfile.c @@ -9,12 +9,55 @@ #include <sys/syscall.h> -#ifdef __NR_sendfile # include <sys/sendfile.h> # include <bits/wordsize.h> + +#if defined __NR_sendfile _syscall4(ssize_t, sendfile, int, out_fd, int, in_fd, __off_t *, offset, size_t, count) # if defined __UCLIBC_HAS_LFS__ && (!defined __NR_sendfile64 || __WORDSIZE == 64) strong_alias_untyped(sendfile,sendfile64) # endif + +#elif defined __NR_sendfile64 && !defined __NR_sendfile +# include <unistd.h> +# include <stddef.h> + +ssize_t sendfile(int out_fd, int in_fd, __off_t *offset, size_t count) +{ + __off64_t off64, *off; + ssize_t res; + + /* + * Check if valid fds and valid pointers were passed + * This does not prevent the user from passing + * an arbitrary pointer causing a segfault or + * other security issues + */ + + if (in_fd < 0 || out_fd < 0) { + __set_errno(EBADF); + return -1; + } + + if (offset == NULL || (int)offset < 0) { + __set_errno(EFAULT); + return -1; + } + + if (offset) { + off = &off64; + off64 = *offset; + } else { + off = NULL; + } + + res = INLINE_SYSCALL(sendfile64, 4, out_fd, in_fd, off, count); + + if (res >= 0) + *offset = off64; + + return res; +} + #endif |