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Commit 4bd112df authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

tools lib api fs: Add helper to read string from procfs file 

To read things like /proc/self/comm.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ztpkbmseidt0hq2psr46o0h9@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent ccd9b2a7

tools/lib/api/fs/fs.c

+13 −0
Original line number Diff line number Diff line
@@ -351,6 +351,19 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep) 
	return err;

}



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

{

	char path[PATH_MAX];

	const char *procfs = procfs__mountpoint();



	if (!procfs)

		return -1;



	snprintf(path, sizeof(path), "%s/%s", procfs, entry);



	return filename__read_str(path, buf, sizep);

}



int sysfs__read_ull(const char *entry, unsigned long long *value)

{

	char path[PATH_MAX];

tools/lib/api/fs/fs.h

+2 −0
Original line number Diff line number Diff line
@@ -29,6 +29,8 @@ 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 procfs__read_str(const char *entry, char **buf, size_t *sizep);



int sysctl__read_int(const char *sysctl, int *value);

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

int sysfs__read_ull(const char *entry, unsigned long long *value);