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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>
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@ -152,16 +152,14 @@ unsigned long convert_unit(unsigned long value, char *unit)
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return value;
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}
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/*
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* Read exactly 'n' bytes or return an error.
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*/
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ssize_t readn(int fd, void *buf, size_t n)
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static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
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{
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void *buf_start = buf;
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size_t left = n;
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while (left) {
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ssize_t ret = read(fd, buf, left);
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ssize_t ret = is_read ? read(fd, buf, left) :
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write(fd, buf, left);
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if (ret <= 0)
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return ret;
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@ -174,6 +172,22 @@ ssize_t readn(int fd, void *buf, size_t n)
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return n;
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}
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/*
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* Read exactly 'n' bytes or return an error.
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*/
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ssize_t readn(int fd, void *buf, size_t n)
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{
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return ion(true, fd, buf, n);
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}
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/*
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* Write exactly 'n' bytes or return an error.
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*/
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ssize_t writen(int fd, void *buf, size_t n)
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{
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return ion(false, fd, buf, n);
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}
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size_t hex_width(u64 v)
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{
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size_t n = 1;
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@ -254,6 +254,7 @@ int strtailcmp(const char *s1, const char *s2);
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char *strxfrchar(char *s, char from, char to);
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unsigned long convert_unit(unsigned long value, char *unit);
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ssize_t readn(int fd, void *buf, size_t n);
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ssize_t writen(int fd, void *buf, size_t n);
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struct perf_event_attr;
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