Adding 'writen' function as a synchronous wrapper
for write syscall with following prototype:
ssize_t writen(int fd, void *buf, size_t n)
Returns the number of bytes written on success
or -1 in case of err.
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Mike Galbraith <efa...@gmx.de>
Cc: David Ahern <dsah...@gmail.com>
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
---
tools/perf/util/util.c | 24 +++++++++++++++++++-----
tools/perf/util/util.h | 1 +
2 files changed, 20 insertions(+), 5 deletions(-)
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 6ea0b4a..b1d5376 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -152,16 +152,14 @@ unsigned long convert_unit(unsigned long value, char
*unit)
return value;
}
-/*
- * Read exactly 'n' bytes or return an error.
- */
-ssize_t readn(int fd, void *buf, size_t n)
+static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
{
void *buf_start = buf;
size_t left = n;
while (left) {
- ssize_t ret = read(fd, buf, left);
+ ssize_t ret = is_read ? read(fd, buf, left) :
+ write(fd, buf, left);
if (ret <= 0)
return ret;
@@ -174,6 +172,22 @@ ssize_t readn(int fd, void *buf, size_t n)
return n;
}
+/*
+ * Read exactly 'n' bytes or return an error.
+ */
+ssize_t readn(int fd, void *buf, size_t n)
+{
+ return ion(true, fd, buf, n);
+}
+
+/*
+ * Write exactly 'n' bytes or return an error.
+ */
+ssize_t writen(int fd, void *buf, size_t n)
+{
+ return ion(false, fd, buf, n);
+}
+
size_t hex_width(u64 v)
{
size_t n = 1;
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 9f6b928..ce0f73d 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -254,6 +254,7 @@ int strtailcmp(const char *s1, const char *s2);
char *strxfrchar(char *s, char from, char to);
unsigned long convert_unit(unsigned long value, char *unit);
ssize_t readn(int fd, void *buf, size_t n);
+ssize_t writen(int fd, void *buf, size_t n);
struct perf_event_attr;
--
1.8.3.1
--
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