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Diffstat (limited to 'libc')
-rw-r--r--libc/stdio/_stdio.h15
1 files changed, 14 insertions, 1 deletions
diff --git a/libc/stdio/_stdio.h b/libc/stdio/_stdio.h
index 310510d66..727e331d1 100644
--- a/libc/stdio/_stdio.h
+++ b/libc/stdio/_stdio.h
@@ -110,6 +110,18 @@ do { \
cfile->__gcs.NAME(cfile->__cookie, ##ARGS); \
}
+#define __STDIO_STREAM_CUSTOM_WRITE_FUNC(S, ARGS...) \
+ if (__STDIO_STREAM_IS_CUSTOM((S))) { \
+ _IO_cookie_file_t *cfile = (_IO_cookie_file_t *) (S); \
+ if (cfile->__gcs.write == NULL) { \
+ __set_errno(EINVAL); \
+ return -1; \
+ } \
+ __set_errno(EAGAIN); \
+ ssize_t w = cfile->__gcs.write(cfile->__cookie, ##ARGS); \
+ return (w == 0 ? -1 : w); \
+ }
+
typedef struct {
struct __STDIO_FILE_STRUCT __fp;
void *__cookie;
@@ -121,6 +133,7 @@ typedef struct {
#undef __STDIO_STREAM_GLIBC_CUSTOM_FILEDES
#define __STDIO_STREAM_IS_CUSTOM(S) (0)
#define __STDIO_STREAM_CUSTOM_IO_FUNC(S, NAME, RC, ARGS...)
+#define __STDIO_STREAM_CUSTOM_WRITE_FUNC(S, ARGS...)
#endif /* __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__ */
@@ -135,7 +148,7 @@ static inline ssize_t __READ(FILE *stream, char *buf, size_t bufsize)
static inline ssize_t __WRITE(FILE *stream, const char *buf, size_t bufsize)
{
- __STDIO_STREAM_CUSTOM_IO_FUNC(stream, write, -1, buf, bufsize);
+ __STDIO_STREAM_CUSTOM_WRITE_FUNC(stream, buf, bufsize);
return write(stream->__filedes, buf, bufsize);
}