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Commit 3b00ea93 authored by Kan Liang's avatar Kan Liang Committed by Arnaldo Carvalho de Melo
Browse files

tools lib api fs: Add sysfs__write_int function 



Add sysfs__write_int() to ease up writing int to sysfs.  New interface
is:

  int sysfs__write_int(const char *entry, int value);

Also, introducing filename__write_int() which is useful for new helpers
to write sysctl values.

Signed-off-by: default avatarKan Liang <Kan.liang@intel.com>
Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Robert Elliott <elliott@hpe.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1495825538-5230-2-git-send-email-kan.liang@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent fd25bf8b

tools/lib/api/fs/fs.c

+30 −0
Original line number Diff line number Diff line
@@ -387,6 +387,22 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep) 
	return err;

}



int filename__write_int(const char *filename, int value)

{

	int fd = open(filename, O_WRONLY), err = -1;

	char buf[64];



	if (fd < 0)

		return err;



	sprintf(buf, "%d", value);

	if (write(fd, buf, sizeof(buf)) == sizeof(buf))

		err = 0;



	close(fd);

	return err;

}



int procfs__read_str(const char *entry, char **buf, size_t *sizep)

{

	char path[PATH_MAX];
@@ -480,3 +496,17 @@ int sysctl__read_int(const char *sysctl, int *value) 


	return filename__read_int(path, value);

}



int sysfs__write_int(const char *entry, int value)

{

	char path[PATH_MAX];

	const char *sysfs = sysfs__mountpoint();



	if (!sysfs)

		return -1;



	if (snprintf(path, sizeof(path), "%s/%s", sysfs, entry) >= PATH_MAX)

		return -1;



	return filename__write_int(path, value);

}

tools/lib/api/fs/fs.h

+4 −0
Original line number Diff line number Diff line
@@ -31,6 +31,8 @@ int filename__read_int(const char *filename, int *value); 
int filename__read_ull(const char *filename, unsigned long long *value);

int filename__read_str(const char *filename, char **buf, size_t *sizep);



int filename__write_int(const char *filename, int value);



int procfs__read_str(const char *entry, char **buf, size_t *sizep);



int sysctl__read_int(const char *sysctl, int *value);
@@ -38,4 +40,6 @@ int sysfs__read_int(const char *entry, int *value); 
int sysfs__read_ull(const char *entry, unsigned long long *value);

int sysfs__read_str(const char *entry, char **buf, size_t *sizep);

int sysfs__read_bool(const char *entry, bool *value);



int sysfs__write_int(const char *entry, int value);

#endif /* __API_FS__ */