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Commit c03538b1 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

libperf: Adopt the readn()/writen() functions from tools/perf 



Move the readn()/writen() functions into libperf.

Keep those non-namespaced names because they will be shared only between
perf and libperf.

Again, these are not exported functions.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-61-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 5643b1a5

tools/perf/lib/Build

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ libperf-y += evsel.o 
libperf-y += evlist.o

libperf-y += zalloc.o

libperf-y += xyarray.o

libperf-y += lib.o



$(OUTPUT)zalloc.o: ../../lib/zalloc.c FORCE

	$(call rule_mkdir)

tools/perf/lib/include/internal/lib.h

0 → 100644
+10 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __LIBPERF_INTERNAL_LIB_H

#define __LIBPERF_INTERNAL_LIB_H



#include <unistd.h>



ssize_t readn(int fd, void *buf, size_t n);

ssize_t writen(int fd, const void *buf, size_t n);



#endif /* __LIBPERF_INTERNAL_CPUMAP_H */

tools/perf/lib/lib.c

0 → 100644
+46 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <unistd.h>

#include <stdbool.h>

#include <errno.h>

#include <linux/kernel.h>

#include <internal/lib.h>



static ssize_t ion(bool is_read, int fd, void *buf, size_t n)

{

	void *buf_start = buf;

	size_t left = n;



	while (left) {

		/* buf must be treated as const if !is_read. */

		ssize_t ret = is_read ? read(fd, buf, left) :

					write(fd, buf, left);



		if (ret < 0 && errno == EINTR)

			continue;

		if (ret <= 0)

			return ret;



		left -= ret;

		buf  += ret;

	}



	BUG_ON((size_t)(buf - buf_start) != 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, const void *buf, size_t n)

{

	/* ion does not modify buf. */

	return ion(false, fd, (void *)buf, n);

}

tools/perf/util/util.c

+0 −40
Original line number Diff line number Diff line
@@ -384,46 +384,6 @@ int copyfile(const char *from, const char *to) 
	return copyfile_mode(from, to, 0755);

}



static ssize_t ion(bool is_read, int fd, void *buf, size_t n)

{

	void *buf_start = buf;

	size_t left = n;



	while (left) {

		/* buf must be treated as const if !is_read. */

		ssize_t ret = is_read ? read(fd, buf, left) :

					write(fd, buf, left);



		if (ret < 0 && errno == EINTR)

			continue;

		if (ret <= 0)

			return ret;



		left -= ret;

		buf  += ret;

	}



	BUG_ON((size_t)(buf - buf_start) != 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, const void *buf, size_t n)

{

	/* ion does not modify buf. */

	return ion(false, fd, (void *)buf, n);

}



size_t hex_width(u64 v)

{

	size_t n = 1;

tools/perf/util/util.h

+1 −3
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include <stddef.h>

#include <linux/compiler.h>

#include <sys/types.h>

#include <internal/lib.h>



/* General helper functions */

void usage(const char *err) __noreturn;
@@ -30,9 +31,6 @@ int copyfile_mode(const char *from, const char *to, mode_t mode); 
int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi);

int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size);



ssize_t readn(int fd, void *buf, size_t n);

ssize_t writen(int fd, const void *buf, size_t n);



size_t hex_width(u64 v);



extern unsigned int page_size;