Re: [PATCH 2/2] v4l-utils: fix compilation with 64-bit time_t

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On Sun, Jun 30, 2024 at 1:50 AM Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
>
> Hi Rosen,
>
> Apologies, I hadn't seen this patch, it was filed in my spam folder for some reason.
>
> On 10/06/2024 23:23, Rosen Penev wrote:
> > musl since version 1.2.0 uses 64-bit time_t even on 32-bit. Cast to
> > 64-bit for compatibility.
> >
> > Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
> > ---
> >  utils/cec-compliance/cec-compliance.cpp   |  3 ++-
> >  utils/cec-compliance/cec-test-adapter.cpp |  5 +++--
> >  utils/cec-ctl/cec-ctl.cpp                 | 19 ++++++++++---------
> >  utils/cec-follower/cec-follower.cpp       |  3 ++-
> >  utils/cec-follower/cec-processing.cpp     |  3 ++-
> >  utils/keytable/keytable.c                 |  1 +
> >  utils/libv4l2util/v4l2_driver.c           |  7 ++++---
> >  utils/v4l2-tracer/retrace.cpp             |  2 +-
> >  8 files changed, 25 insertions(+), 18 deletions(-)
> >
> > diff --git a/utils/cec-compliance/cec-compliance.cpp b/utils/cec-compliance/cec-compliance.cpp
> > index 8075e1d6..df633a33 100644
> > --- a/utils/cec-compliance/cec-compliance.cpp
> > +++ b/utils/cec-compliance/cec-compliance.cpp
> > @@ -3,6 +3,7 @@
> >   * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
> >   */
> >
> > +#include <cinttypes>
> >  #include <sstream>
> >
> >  #include <fcntl.h>
> > @@ -279,7 +280,7 @@ static std::string ts2s(__u64 ts)
> >       t = res.tv_sec;
> >       s = ctime(&t);
> >       s = s.substr(0, s.length() - 6);
> > -     sprintf(buf, "%03lu", res.tv_usec / 1000);
> > +     sprintf(buf, "%03" PRIu64, (uint64_t)res.tv_usec / 1000);
>
> This doesn't make sense: why is res.tv_usec cast to a uint64_t?
> Is that field really a 64 bit value under musl? But in any case, tv_usec is
> limited to 999999, so if it is a 64 bit value under musl, then just cast it
> to unsigned long and leave the %03lu as-is.
That's suseconds_t which is 64-bit. I felt it would be safer to cast
to 64-bit, but OK.
>
> The commit log is certainly insufficient since a lot of the changes in this
> patch have nothing to do with time_t but with tv_n/usec.
include/alltypes.h.in:TYPEDEF _Int64 suseconds_t; : <-- from musl source.
>
> Why use PRIu64? That's not explained in the commit log either. I had to look
> that up, as I've never seen it used before.
>
> As I understand it, musl doesn't support %llu in some cases? Looking at:
>
> https://github.com/cloudius-systems/musl/blob/master/include/inttypes.h
>
> it appears that PRIu64 can either be lu or llu. lu is used if UINTPTR_MAX == UINT64_MAX.
>
> But if that is needed, then I expect to see a single patch converting every
> %lld and %llu in v4l-utils to use PRId/u64. Here it is only done for some
> time-related code.
not exactly. kernel types use long long always. musl switches between both.
>
> Please don't mix changing to PRId/u64 with these time changes. If you believe
> that is needed, then do that as a final patch for all of v4l-utils. But the
> commit log should be very clear explaining why it is needed.
>
> Regards,
>
>         Hans
>
> >       return s + "." + buf;
> >  }
> >
> > diff --git a/utils/cec-compliance/cec-test-adapter.cpp b/utils/cec-compliance/cec-test-adapter.cpp
> > index 08c856af..7a80d17b 100644
> > --- a/utils/cec-compliance/cec-test-adapter.cpp
> > +++ b/utils/cec-compliance/cec-test-adapter.cpp
> > @@ -4,6 +4,7 @@
> >   */
> >
> >  #include <cerrno>
> > +#include <cinttypes>
> >  #include <ctime>
> >  #include <string>
> >
> > @@ -1276,9 +1277,9 @@ static int testLostMsgs(struct node *node)
> >                       printf("\t\tReceived messages: %d of which %d were CEC_MSG_CEC_VERSION\n",
> >                              pending_rx_msgs, pending_rx_cec_version_msgs);
> >               if (pending_quick_msgs < pending_msgs)
> > -                     printf("\t\tReceived %d messages immediately, and %d over %ld seconds\n",
> > +                     printf("\t\tReceived %d messages immediately, and %d over %" PRIu64 " seconds\n",
> >                              pending_quick_msgs, pending_msgs - pending_quick_msgs,
> > -                            time(nullptr) - start);
> > +                            (uint64_t)time(nullptr) - start);
> >       }
> >       print_sfts(sft[1][1], "SFTs for repeating messages (>= 7)");
> >       print_sfts(sft[1][0], "SFTs for repeating remote messages (>= 7)");
> > diff --git a/utils/cec-ctl/cec-ctl.cpp b/utils/cec-ctl/cec-ctl.cpp
> > index 69aeb8cd..a2ffcb2b 100644
> > --- a/utils/cec-ctl/cec-ctl.cpp
> > +++ b/utils/cec-ctl/cec-ctl.cpp
> > @@ -6,6 +6,7 @@
> >  #include <algorithm>
> >  #include <cctype>
> >  #include <cerrno>
> > +#include <cinttypes>
> >  #include <cstring>
> >  #include <ctime>
> >  #include <map>
> > @@ -416,7 +417,7 @@ std::string ts2s(__u64 ts)
> >               strftime(buf, sizeof(buf), "%a %b %e %T.000000", &tm);
> >       }
> >       secs = last_secs + t - last_t;
> > -     sprintf(buf + 14, "%02u:%02u.%06lu", secs / 60, secs % 60, res.tv_usec);
> > +     sprintf(buf + 14, "%02u:%02u.%06d", secs / 60, secs % 60, (int)res.tv_usec);
> >       return buf;
> >  }
> >
> > @@ -944,10 +945,10 @@ static void monitor(const struct node &node, __u32 monitor_time, const char *sto
> >               }
> >               fprintf(fstore, "# cec-ctl --store-pin\n");
> >               fprintf(fstore, "# version %d\n", CEC_CTL_VERSION);
> > -             fprintf(fstore, "# start_monotonic %lu.%09lu\n",
> > -                     start_monotonic.tv_sec, start_monotonic.tv_nsec);
> > -             fprintf(fstore, "# start_timeofday %lu.%06lu\n",
> > -                     start_timeofday.tv_sec, start_timeofday.tv_usec);
> > +             fprintf(fstore, "# start_monotonic %" PRIu64 ".%09" PRIu64 "\n",
> > +                     (uint64_t)start_monotonic.tv_sec, (uint64_t)start_monotonic.tv_nsec);
> > +             fprintf(fstore, "# start_timeofday %" PRIu64 ".%06" PRIu64 "\n",
> > +                     (uint64_t)start_timeofday.tv_sec, (uint64_t)start_timeofday.tv_usec);
> >               fprintf(fstore, "# log_addr_mask 0x%04x\n", node.log_addr_mask);
> >               fprintf(fstore, "# phys_addr %x.%x.%x.%x\n",
> >                       cec_phys_addr_exp(node.phys_addr));
> > @@ -986,10 +987,10 @@ static void monitor(const struct node &node, __u32 monitor_time, const char *sto
> >                        */
> >                       clock_gettime(CLOCK_MONOTONIC, &start_monotonic);
> >                       gettimeofday(&start_timeofday, nullptr);
> > -                     fprintf(fstore, "# start_monotonic %lu.%09lu\n",
> > -                             start_monotonic.tv_sec, start_monotonic.tv_nsec);
> > -                     fprintf(fstore, "# start_timeofday %lu.%06lu\n",
> > -                             start_timeofday.tv_sec, start_timeofday.tv_usec);
> > +                     fprintf(fstore, "# start_monotonic %" PRIu64 ".%09" PRIu64 "\n",
> > +                             (uint64_t)start_monotonic.tv_sec, (uint64_t)start_monotonic.tv_nsec);
> > +                     fprintf(fstore, "# start_timeofday %" PRIu64 ".%06" PRIu64 "\n",
> > +                             (uint64_t)start_timeofday.tv_sec, (uint64_t)start_timeofday.tv_usec);
> >                       fflush(fstore);
> >                       start_minute = now;
> >               }
> > diff --git a/utils/cec-follower/cec-follower.cpp b/utils/cec-follower/cec-follower.cpp
> > index a7481aea..9b29e3c6 100644
> > --- a/utils/cec-follower/cec-follower.cpp
> > +++ b/utils/cec-follower/cec-follower.cpp
> > @@ -3,6 +3,7 @@
> >   * Copyright 2016 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
> >   */
> >
> > +#include <cinttypes>
> >  #include <cstring>
> >  #include <ctime>
> >  #include <sstream>
> > @@ -354,7 +355,7 @@ void print_timers(struct node *node)
> >                       printf("source: %s, ", source.c_str());
> >                       if (t.recording_seq)
> >                               printf("rec-seq: 0x%x, ", t.recording_seq);
> > -                     printf("needs: %ld %s\n", t.duration, "MB."); /* 1MB per second. */
> > +                     printf("needs: %" PRIu64 " %s\n", (uint64_t)t.duration, "MB."); /* 1MB per second. */
> >               }
> >               printf("Total media space available for recording: ");
> >               if (node->state.media_space_available >= 0)
> > diff --git a/utils/cec-follower/cec-processing.cpp b/utils/cec-follower/cec-processing.cpp
> > index 3b5c3ce5..cc38f143 100644
> > --- a/utils/cec-follower/cec-processing.cpp
> > +++ b/utils/cec-follower/cec-processing.cpp
> > @@ -6,6 +6,7 @@
> >  #include "linux/compiler.h"
> >
> >  #include <cerrno>
> > +#include <cinttypes>
> >  #include <ctime>
> >  #include <string>
> >
> > @@ -74,7 +75,7 @@ static std::string ts2s(__u64 ts, bool wallclock)
> >       t = res.tv_sec;
> >       s = ctime(&t);
> >       s = s.substr(0, s.length() - 6);
> > -     sprintf(buf, "%03lu", res.tv_usec / 1000);
> > +     sprintf(buf, "%03" PRIu64, (uint64_t)res.tv_usec / 1000);
> >       return s + "." + buf;
> >  }
> >
> > diff --git a/utils/keytable/keytable.c b/utils/keytable/keytable.c
> > index a726921a..ba7c7c4d 100644
> > --- a/utils/keytable/keytable.c
> > +++ b/utils/keytable/keytable.c
> > @@ -214,6 +214,7 @@ static enum sysfs_protocols parse_sysfs_protocol(const char *name, bool all_allo
> >       return SYSFS_INVALID;
> >  }
> >
> > +__attribute__((format(printf, 3, 0)))
> >  static void write_sysfs_protocols(enum sysfs_protocols protocols, FILE *fp, const char *fmt)
> >  {
> >       const struct protocol_map_entry *pme;
> > diff --git a/utils/libv4l2util/v4l2_driver.c b/utils/libv4l2util/v4l2_driver.c
> > index 6b6366fa..5cd63fac 100644
> > --- a/utils/libv4l2util/v4l2_driver.c
> > +++ b/utils/libv4l2util/v4l2_driver.c
> > @@ -15,6 +15,7 @@
> >  #include <assert.h>
> >  #include <errno.h>
> >  #include <fcntl.h>
> > +#include <inttypes.h>
> >  #include <stdio.h>
> >  #include <stdlib.h>
> >  #include <string.h>
> > @@ -174,13 +175,13 @@ static void prt_buf_info(char *name,struct v4l2_buffer *p)
> >  {
> >       struct v4l2_timecode *tc=&p->timecode;
> >
> > -     printf ("%s: %02ld:%02d:%02d.%08ld index=%d, type=%s, "
> > +     printf ("%s: %02" PRIu64 ":%02d:%02d.%08" PRIu64 " index=%d, type=%s, "
> >               "bytesused=%d, flags=0x%08x, "
> >               "field=%s, sequence=%d, memory=%s, offset=0x%08x, length=%d\n",
> > -             name, (p->timestamp.tv_sec/3600),
> > +             name, (uint64_t)(p->timestamp.tv_sec/3600),
> >               (int)(p->timestamp.tv_sec/60)%60,
> >               (int)(p->timestamp.tv_sec%60),
> > -             p->timestamp.tv_usec,
> > +             (uint64_t)p->timestamp.tv_usec,
> >               p->index,
> >               prt_names(p->type,v4l2_type_names),
> >               p->bytesused,p->flags,
> > diff --git a/utils/v4l2-tracer/retrace.cpp b/utils/v4l2-tracer/retrace.cpp
> > index 60d64d8b..010936c0 100644
> > --- a/utils/v4l2-tracer/retrace.cpp
> > +++ b/utils/v4l2-tracer/retrace.cpp
> > @@ -72,7 +72,7 @@ void retrace_mmap(json_object *mmap_obj, bool is_mmap64)
> >                                  (long) buf_address_retrace_pointer);
> >
> >       if (is_verbose() || (errno != 0)) {
> > -             fprintf(stderr, "fd: %d, offset: %ld, ", fd_retrace, off);
> > +             fprintf(stderr, "fd: %d, offset: %lld, ", fd_retrace, (long long)off);
> >               if (is_mmap64)
> >                       perror("mmap64");
> >               else
>





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