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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-12-11 13:17:46 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-12-11 13:17:46 -0300 |
| commit | 3a351127cbc682c3a0ae7383c4ff6fd0e8fee83c (patch) | |
| tree | 7764be99863cf2d9ca95f0f42336756f0e6dcbb7 /tools/lib/api | |
| parent | perf kvm stat live: Mark events as (x86 only) in help output (diff) | |
| download | linux-dev-3a351127cbc682c3a0ae7383c4ff6fd0e8fee83c.tar.xz linux-dev-3a351127cbc682c3a0ae7383c4ff6fd0e8fee83c.zip | |
tools lib fs: Adopt filename__read_int from tools/perf/
Will be useful for new helpers to read sysctl values.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib/api')
| -rw-r--r-- | tools/lib/api/fs/fs.c | 21 | ||||
| -rw-r--r-- | tools/lib/api/fs/fs.h | 2 |
2 files changed, 23 insertions, 0 deletions
diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c index c1b49c36a951..b8d0df8878d1 100644 --- a/tools/lib/api/fs/fs.c +++ b/tools/lib/api/fs/fs.c @@ -7,6 +7,10 @@ #include <stdlib.h> #include <string.h> #include <sys/vfs.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> #include "debugfs.h" #include "fs.h" @@ -163,3 +167,20 @@ const char *name##__mountpoint(void) \ FS__MOUNTPOINT(sysfs, FS__SYSFS); FS__MOUNTPOINT(procfs, FS__PROCFS); + +int filename__read_int(const char *filename, int *value) +{ + char line[64]; + int fd = open(filename, O_RDONLY), err = -1; + + if (fd < 0) + return -1; + + if (read(fd, line, sizeof(line)) > 0) { + *value = atoi(line); + err = 0; + } + + close(fd); + return err; +} diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h index cb7049551f33..4d0aef6e7163 100644 --- a/tools/lib/api/fs/fs.h +++ b/tools/lib/api/fs/fs.h @@ -11,4 +11,6 @@ const char *sysfs__mountpoint(void); const char *procfs__mountpoint(void); + +int filename__read_int(const char *filename, int *value); #endif /* __API_FS__ */ |