perf header: Fix up argument to ctime()

Reducing this noise when cross building to the Android NDK:

  util/header.c: In function 'perf_header__fprintf_info':
  util/header.c:2710:45: warning: pointer targets in passing argument 1 of 'ctime' differ in signedness [-Wpointer-sign]
    fprintf(fp, "# captured on    : %s", ctime(&st.st_ctime));
  In file included from util/../perf.h:5:0,
                   from util/evlist.h:11,
                   from util/header.c:22:
  /opt/android-ndk-r15c/platforms/android-26/arch-arm/usr/include/time.h:81:14: note: expected 'const time_t *' but argument is of type 'long unsigned int *'
   extern char* ctime(const time_t*) __LIBC_ABI_PUBLIC__;

Cc: Adrian Hunter <>
Cc: Jiri Olsa <>
Cc: Namhyung Kim <>
Link: 's avatarArnaldo Carvalho de Melo <>
parent 748fe088
......@@ -2698,6 +2698,7 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
struct perf_header *header = &session->header;
int fd = perf_data__fd(session->data);
struct stat st;
time_t stctime;
int ret, bit;
hd.fp = fp;
......@@ -2707,7 +2708,8 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
if (ret == -1)
return -1;
fprintf(fp, "# captured on : %s", ctime(&st.st_ctime));
stctime = st.st_ctime;
fprintf(fp, "# captured on : %s", ctime(&stctime));
fprintf(fp, "# header version : %u\n", header->version);
fprintf(fp, "# data offset : %" PRIu64 "\n", header->data_offset);
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