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Date: Mon, 13 Jul 2015 10:30:21 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Julia Lawall <julia.lawall@...6.fr>,
Cristina Georgiana Opriceana <cristina.opriceana@...il.com>
CC: Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald <pmeerw@...erw.net>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
linux-kernel@...r.kernel.org,
Daniel Baluta <daniel.baluta@...el.com>,
octavian.purdila@...el.com
Subject: Re: [PATCH v2 1/4] tools: iio: Move printf failure messages to stderr
On 12 July 2015 13:20:45 BST, Julia Lawall <julia.lawall@...6.fr> wrote:
>> Yes, I could have included all in a single patch, but I tried to
>> automatize this task and build a rather generic semantic patch in
>> coccinelle for the substitutions. Had I included all in one patch,
>the
>> changes with coccinelle wouldn't have been differentiated from the
>> other ones. If that is okay, I think I can merge them in one patch.
>
>If it seems important, then you can say in the commit message what was
>done
>by hand.
>
>julia
Agreed. This is interesting information so a brief note would be great.
>
>
>> >> Signed-off-by: Cristina Opriceana <cristina.opriceana@...il.com>
>> >> ---
>> >> Changes in v2:
>> >> - s/failiure/failure
>> >>
>> >> tools/iio/generic_buffer.c | 17 ++++++++++-------
>> >> tools/iio/iio_event_monitor.c | 6 +++---
>> >> tools/iio/iio_utils.c | 34
>++++++++++++++++++++--------------
>> >> 3 files changed, 33 insertions(+), 24 deletions(-)
>> >>
>> >> diff --git a/tools/iio/generic_buffer.c
>b/tools/iio/generic_buffer.c
>> >> index 0e73723..2f4e12f 100644
>> >> --- a/tools/iio/generic_buffer.c
>> >> +++ b/tools/iio/generic_buffer.c
>> >> @@ -271,7 +271,7 @@ int main(int argc, char **argv)
>> >> }
>> >>
>> >> if (device_name == NULL) {
>> >> - printf("Device name not set\n");
>> >> + fprintf(stderr, "Device name not set\n");
>> >> print_usage();
>> >> return -1;
>> >> }
>> >> @@ -279,7 +279,7 @@ int main(int argc, char **argv)
>> >> /* Find the device requested */
>> >> dev_num = find_type_by_name(device_name, "iio:device");
>> >> if (dev_num < 0) {
>> >> - printf("Failed to find the %s\n", device_name);
>> >> + fprintf(stderr, "Failed to find the %s\n",
>device_name);
>> >> return dev_num;
>> >> }
>> >>
>> >> @@ -307,7 +307,8 @@ int main(int argc, char **argv)
>> >> /* Verify the trigger exists */
>> >> trig_num = find_type_by_name(trigger_name,
>"trigger");
>> >> if (trig_num < 0) {
>> >> - printf("Failed to find the trigger %s\n",
>trigger_name);
>> >> + fprintf(stderr, "Failed to find the trigger
>%s\n",
>> >> + trigger_name);
>> >> ret = trig_num;
>> >> goto error_free_triggername;
>> >> }
>> >> @@ -323,7 +324,7 @@ int main(int argc, char **argv)
>> >> */
>> >> ret = build_channel_array(dev_dir_name, &channels,
>&num_channels);
>> >> if (ret) {
>> >> - printf("Problem reading scan element
>information\n");
>> >> + fprintf(stderr, "Problem reading scan element
>information\n");
>> >> printf("diag %s\n", dev_dir_name);
>> >
>> > My preference would even be to print it all in just one fprintf.
>>
>> I thought so, also, but the string would go beyond 80 characters and
>> would have to be split which is ugly and brings a warning on it.
>>
>> >> goto error_free_triggername;
>> >> }
>> >> @@ -350,7 +351,8 @@ int main(int argc, char **argv)
>> >> dev_dir_name,
>> >> trigger_name);
>> >> if (ret < 0) {
>> >> - printf("Failed to write current_trigger
>file\n");
>> >> + fprintf(stderr,
>> >> + "Failed to write current_trigger
>file\n");
>> >> goto error_free_buf_dir_name;
>> >> }
>> >> }
>> >> @@ -382,7 +384,7 @@ int main(int argc, char **argv)
>> >> fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
>> >> if (fp == -1) { /* TODO: If it isn't there make the node */
>> >> ret = -errno;
>> >> - printf("Failed to open %s\n", buffer_access);
>> >> + fprintf(stderr, "Failed to open %s\n",
>buffer_access);
>> >> goto error_free_buffer_access;
>> >> }
>> >>
>> >
>> > At line 410 we have a block:
>> > read_size = read(fp, data, toread * scan_size);
>> > if (read_size < 0) {
>> > if (errno == EAGAIN) {
>> > printf("nothing available\n");
>> > continue;
>> >
>> > I'm tempted to say,that this should go to stderr, as well. Any
>opinions?
>>
>> I see it more as an informing note, since the device continues
>looping
>> for data, but it could be considered an error as well.
>>
>> >> @@ -431,7 +433,8 @@ int main(int argc, char **argv)
>> >> ret = write_sysfs_string("trigger/current_trigger",
>> >> dev_dir_name, "NULL");
>> >> if (ret < 0)
>> >> - printf("Failed to write to %s\n",
>dev_dir_name);
>> >> + fprintf(stderr, "Failed to write to %s\n",
>> >> + dev_dir_name);
>> >>
>> >> error_close_buffer_access:
>> >> if (close(fp) == -1)
>> >> diff --git a/tools/iio/iio_event_monitor.c
>b/tools/iio/iio_event_monitor.c
>> >> index 703f4cb..843bc4c 100644
>> >> --- a/tools/iio/iio_event_monitor.c
>> >> +++ b/tools/iio/iio_event_monitor.c
>> >
>> > At line 217:
>> > if (!event_is_known(event)) {
>> > printf("Unknown event: time: %lld, id: %llx\n",
>> > event->timestamp, event->id);
>> >
>> > return;
>> > Better have this on stderr, as well?
>>
>> This is more suitable for stderr, indeed.
>>
>> >> @@ -278,14 +278,14 @@ int main(int argc, char **argv)
>> >> fd = open(chrdev_name, 0);
>> >> if (fd == -1) {
>> >> ret = -errno;
>> >> - fprintf(stdout, "Failed to open %s\n", chrdev_name);
>> >> + fprintf(stderr, "Failed to open %s\n", chrdev_name);
>> >> goto error_free_chrdev_name;
>> >> }
>> >>
>> >> ret = ioctl(fd, IIO_GET_EVENT_FD_IOCTL, &event_fd);
>> >> if (ret == -1 || event_fd == -1) {
>> >> ret = -errno;
>> >> - fprintf(stdout, "Failed to retrieve event fd\n");
>> >> + fprintf(stderr, "Failed to retrieve event fd\n");
>> >> if (close(fd) == -1)
>> >> perror("Failed to close character device
>file");
>> >>
>> >
>> > A similar borderline case as above in line 301:
>> > ret = read(event_fd, &event, sizeof(event));
>> > if (ret == -1) {
>> > if (errno == EAGAIN) {
>> > printf("nothing available\n");
>> > continue;
>> >
>> >> @@ -311,7 +311,7 @@ int main(int argc, char **argv)
>> >> }
>> >>
>> >> if (ret != sizeof(event)) {
>> >> - printf("Reading event failed!\n");
>> >> + fprintf(stderr, "Reading event failed!\n");
>> >> ret = -EIO;
>> >> break;
>> >> }
>> >> diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
>> >> index 8fb3214..46dfa3f 100644
>> >> --- a/tools/iio/iio_utils.c
>> >> +++ b/tools/iio/iio_utils.c
>> >> @@ -140,7 +140,8 @@ int iioutils_get_type(unsigned *is_signed,
>unsigned *bytes, unsigned *bits_used,
>> >> sysfsfp = fopen(filename, "r");
>> >> if (sysfsfp == NULL) {
>> >> ret = -errno;
>> >> - printf("failed to open %s\n",
>filename);
>> >> + fprintf(stderr, "failed to open
>%s\n",
>> >> + filename);
>> >> goto error_free_filename;
>> >> }
>> >>
>> >> @@ -152,7 +153,8 @@ int iioutils_get_type(unsigned *is_signed,
>unsigned *bytes, unsigned *bits_used,
>> >> &padint, shift);
>> >> if (ret < 0) {
>> >> ret = -errno;
>> >> - printf("failed to pass scan type
>description\n");
>> >> + fprintf(stderr,
>> >> + "failed to pass scan type
>description\n");
>> >> goto error_close_sysfsfp;
>> >> } else if (ret != 5) {
>> >> ret = -EIO;
>> >> @@ -170,7 +172,8 @@ int iioutils_get_type(unsigned *is_signed,
>unsigned *bytes, unsigned *bits_used,
>> >> *is_signed = (signchar == 's');
>> >> if (fclose(sysfsfp)) {
>> >> ret = -errno;
>> >> - printf("Failed to close %s\n",
>filename);
>> >> + fprintf(stderr, "Failed to close
>%s\n",
>> >> + filename);
>> >> goto error_free_filename;
>> >> }
>> >>
>> >> @@ -454,7 +457,8 @@ int build_channel_array(const char
>*device_dir,
>> >> sysfsfp = fopen(filename, "r");
>> >> if (sysfsfp == NULL) {
>> >> ret = -errno;
>> >> - printf("failed to open %s\n",
>filename);
>> >> + fprintf(stderr, "failed to open
>%s\n",
>> >> + filename);
>> >> free(filename);
>> >> goto error_cleanup_array;
>> >> }
>> >> @@ -581,11 +585,13 @@ int find_type_by_name(const char *name,
>const char *type)
>> >> ret = sscanf(ent->d_name + strlen(type),
>"%d", &number);
>> >> if (ret < 0) {
>> >> ret = -errno;
>> >> - printf("failed to read element
>number\n");
>> >> + fprintf(stderr,
>> >> + "failed to read element
>number\n");
>> >> goto error_close_dir;
>> >> } else if (ret != 1) {
>> >> ret = -EIO;
>> >> - printf("failed to match element
>number\n");
>> >> + fprintf(stderr,
>> >> + "failed to match element
>number\n");
>> >> goto error_close_dir;
>> >> }
>> >>
>> >> @@ -664,7 +670,7 @@ static int _write_sysfs_int(const char
>*filename, const char *basedir, int val,
>> >> sysfsfp = fopen(temp, "w");
>> >> if (sysfsfp == NULL) {
>> >> ret = -errno;
>> >> - printf("failed to open %s\n", temp);
>> >> + fprintf(stderr, "failed to open %s\n", temp);
>> >> goto error_free;
>> >> }
>> >>
>> >> @@ -685,7 +691,7 @@ static int _write_sysfs_int(const char
>*filename, const char *basedir, int val,
>> >> sysfsfp = fopen(temp, "r");
>> >> if (sysfsfp == NULL) {
>> >> ret = -errno;
>> >> - printf("failed to open %s\n", temp);
>> >> + fprintf(stderr, "failed to open %s\n",
>temp);
>> >> goto error_free;
>> >> }
>> >>
>> >> @@ -750,7 +756,7 @@ static int _write_sysfs_string(const char
>*filename, const char *basedir,
>> >> char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
>> >>
>> >> if (temp == NULL) {
>> >> - printf("Memory allocation failed\n");
>> >> + fprintf(stderr, "Memory allocation failed\n");
>> >> return -ENOMEM;
>> >> }
>> >>
>> >> @@ -761,7 +767,7 @@ static int _write_sysfs_string(const char
>*filename, const char *basedir,
>> >> sysfsfp = fopen(temp, "w");
>> >> if (sysfsfp == NULL) {
>> >> ret = -errno;
>> >> - printf("Could not open %s\n", temp);
>> >> + fprintf(stderr, "Could not open %s\n", temp);
>> >> goto error_free;
>> >> }
>> >>
>> >> @@ -782,7 +788,7 @@ static int _write_sysfs_string(const char
>*filename, const char *basedir,
>> >> sysfsfp = fopen(temp, "r");
>> >> if (sysfsfp == NULL) {
>> >> ret = -errno;
>> >> - printf("Could not open file to verify\n");
>> >> + fprintf(stderr, "Could not open file to
>verify\n");
>> >> goto error_free;
>> >> }
>> >>
>> >> @@ -856,7 +862,7 @@ int read_sysfs_posint(const char *filename,
>const char *basedir)
>> >> char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
>> >>
>> >> if (temp == NULL) {
>> >> - printf("Memory allocation failed");
>> >> + fprintf(stderr, "Memory allocation failed");
>> >> return -ENOMEM;
>> >> }
>> >>
>> >> @@ -903,7 +909,7 @@ int read_sysfs_float(const char *filename,
>const char *basedir, float *val)
>> >> char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
>> >>
>> >> if (temp == NULL) {
>> >> - printf("Memory allocation failed");
>> >> + fprintf(stderr, "Memory allocation failed");
>> >> return -ENOMEM;
>> >> }
>> >>
>> >> @@ -950,7 +956,7 @@ int read_sysfs_string(const char *filename,
>const char *basedir, char *str)
>> >> char *temp = malloc(strlen(basedir) + strlen(filename) + 2);
>> >>
>> >> if (temp == NULL) {
>> >> - printf("Memory allocation failed");
>> >> + fprintf(stderr, "Memory allocation failed");
>> >> return -ENOMEM;
>> >> }
>> >>
>> >>
>> >
>>
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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