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perf top: Fix window dimensions change handling 

The stdio perf top crashes when we change the terminal
window size. The reason is that we assumed we get the
perf_top pointer as a signal handler argument which is
not the case.

Changing the SIGWINCH handler logic to change global
resize variable, which is checked in the main thread
loop.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ysuzwz77oev1ftgvdscn9bpu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
zero-colors
Jiri Olsa 2017-11-14 10:23:39 +01:00 committed by Arnaldo Carvalho de Melo
parent 34900ec5c9
commit 89d0aeab42
1 changed files with 12 additions and 3 deletions
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15
tools/perf/builtin-top.c
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@ -77,6 +77,7 @@
#include "sane_ctype.h"
static volatile int done;
static volatile int resize;
#define HEADER_LINE_NR 5
@ -86,10 +87,13 @@ static void perf_top__update_print_entries(struct perf_top *top)
}
static void perf_top__sig_winch(int sig __maybe_unused,
siginfo_t *info __maybe_unused, void *arg)
siginfo_t *info __maybe_unused, void *arg __maybe_unused)
{
struct perf_top *top = arg;
resize = 1;
}
static void perf_top__resize(struct perf_top *top)
{
get_term_dimensions(&top->winsize);
perf_top__update_print_entries(top);
}
@ -477,7 +481,7 @@ static bool perf_top__handle_keypress(struct perf_top *top, int c)
.sa_sigaction = perf_top__sig_winch,
.sa_flags = SA_SIGINFO,
};
perf_top__sig_winch(SIGWINCH, NULL, top);
perf_top__resize(top);
sigaction(SIGWINCH, &act, NULL);
} else {
signal(SIGWINCH, SIG_DFL);
@ -1032,6 +1036,11 @@ static int __cmd_top(struct perf_top *top)
if (hits == top->samples)
ret = perf_evlist__poll(top->evlist, 100);
if (resize) {
perf_top__resize(top);
resize = 0;
}
}
ret = 0;