From: Jiri Olsa <[email protected]> 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 <[email protected]> Requested-by: Arnaldo Carvalho de Melo <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/util.c | 24 +++++++++++++++++++----- 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 6ea0b4ae9569..b1d5376b9dd9 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 9f6b928f6b2b..ce0f73d4d91f 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; -- 1.8.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
