diff options
| author | Jiri Olsa <jolsa@redhat.com> | 2013-11-28 11:30:16 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-12-02 09:22:46 -0300 |
| commit | bc3a502bc2bc78d03526d6abcc5697aab18d5ae9 (patch) | |
| tree | 9811125522636d12b6c2bb67d8ef4e8c69f6511c /tools/perf/util | |
| parent | 838d14520267769648fb2fc2a637107a1d102590 (diff) | |
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: Jiri Olsa <jolsa@redhat.com>
Requested-by: Arnaldo 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: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util')
| -rw-r--r-- | tools/perf/util/util.c | 24 | ||||
| -rw-r--r-- | tools/perf/util/util.h | 1 |
2 files changed, 20 insertions, 5 deletions
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 6ea0b4ae956..b1d5376b9dd 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -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; diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 9f6b928f6b2..ce0f73d4d91 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -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; |