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Commit bc3a502b authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add writen function 



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: default avatarJiri Olsa <jolsa@redhat.com>
Requested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1385634619-8129-5-git-send-email-jolsa@redhat.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 838d1452

tools/perf/util/util.c

+19 −5
Original line number Diff line number Diff line
@@ -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;

tools/perf/util/util.h

+1 −0
Original line number Diff line number Diff line
@@ -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;