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authorWarner Losh <imp@bsdimp.com>2022-01-31 16:34:03 -0700
committerWarner Losh <imp@bsdimp.com>2022-06-10 22:00:48 -0600
commit770d8abae736535c9bff17ee82bd48aea0e5fea4 (patch)
tree2212963d53312d78e02b4bcc4948760b5043f265 /bsd-user/bsd-file.h
parent80da1b00886782520286e26f39ce8e21c1855072 (diff)
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bsd-user/bsd-file.h: Meat of the write system calls
Implement write, writev, pwrite and pwritev and connect them to the system call dispatch routine. Signed-off-by: Stacey Son <sson@FreeBSD.org> Signed-off-by: Kyle Evans <kevans@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'bsd-user/bsd-file.h')
-rw-r--r--bsd-user/bsd-file.h84
1 files changed, 84 insertions, 0 deletions
diff --git a/bsd-user/bsd-file.h b/bsd-user/bsd-file.h
index 839f8c5..e9e2c85 100644
--- a/bsd-user/bsd-file.h
+++ b/bsd-user/bsd-file.h
@@ -32,6 +32,11 @@ ssize_t safe_pread(int fd, void *buf, size_t nbytes, off_t offset);
ssize_t safe_readv(int fd, const struct iovec *iov, int iovcnt);
ssize_t safe_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+ssize_t safe_write(int fd, void *buf, size_t nbytes);
+ssize_t safe_pwrite(int fd, void *buf, size_t nbytes, off_t offset);
+ssize_t safe_writev(int fd, const struct iovec *iov, int iovcnt);
+ssize_t safe_pwritev(int fd, const struct iovec *iov, int iovcnt, off_t offset);
+
/* read(2) */
static abi_long do_bsd_read(abi_long arg1, abi_long arg2, abi_long arg3)
{
@@ -106,4 +111,83 @@ static abi_long do_bsd_preadv(void *cpu_env, abi_long arg1,
return ret;
}
+/* write(2) */
+static abi_long do_bsd_write(abi_long arg1, abi_long arg2, abi_long arg3)
+{
+ abi_long nbytes, ret;
+ void *p;
+
+ /* nbytes < 0 implies that it was larger than SIZE_MAX. */
+ nbytes = arg3;
+ if (nbytes < 0) {
+ return -TARGET_EINVAL;
+ }
+ p = lock_user(VERIFY_READ, arg2, nbytes, 1);
+ if (p == NULL) {
+ return -TARGET_EFAULT;
+ }
+ ret = get_errno(safe_write(arg1, p, arg3));
+ unlock_user(p, arg2, 0);
+
+ return ret;
+}
+
+/* pwrite(2) */
+static abi_long do_bsd_pwrite(void *cpu_env, abi_long arg1,
+ abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
+{
+ abi_long ret;
+ void *p;
+
+ p = lock_user(VERIFY_READ, arg2, arg3, 1);
+ if (p == NULL) {
+ return -TARGET_EFAULT;
+ }
+ if (regpairs_aligned(cpu_env) != 0) {
+ arg4 = arg5;
+ arg5 = arg6;
+ }
+ ret = get_errno(safe_pwrite(arg1, p, arg3, target_arg64(arg4, arg5)));
+ unlock_user(p, arg2, 0);
+
+ return ret;
+}
+
+/* writev(2) */
+static abi_long do_bsd_writev(abi_long arg1, abi_long arg2, abi_long arg3)
+{
+ abi_long ret;
+ struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
+
+ if (vec != NULL) {
+ ret = get_errno(safe_writev(arg1, vec, arg3));
+ unlock_iovec(vec, arg2, arg3, 0);
+ } else {
+ ret = -host_to_target_errno(errno);
+ }
+
+ return ret;
+}
+
+/* pwritev(2) */
+static abi_long do_bsd_pwritev(void *cpu_env, abi_long arg1,
+ abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6)
+{
+ abi_long ret;
+ struct iovec *vec = lock_iovec(VERIFY_READ, arg2, arg3, 1);
+
+ if (vec != NULL) {
+ if (regpairs_aligned(cpu_env) != 0) {
+ arg4 = arg5;
+ arg5 = arg6;
+ }
+ ret = get_errno(safe_pwritev(arg1, vec, arg3, target_arg64(arg4, arg5)));
+ unlock_iovec(vec, arg2, arg3, 0);
+ } else {
+ ret = -host_to_target_errno(errno);
+ }
+
+ return ret;
+}
+
#endif /* BSD_FILE_H */