Re: [spamdyke-users] 5.0.1 - make warning fscanf on Ubuntu 14.04 LTS
They're just warnings that I'm not checking the return value of a call to fscanf(). fscanf() reads data from a file into one or more variables; its return value shows how many variables were assigned. In the case of those lines, I'm using fscanf() to simply skip over any carriage return or newline characters at the end of a line and not assigning anything to any variables. That's why I'm not checking the return value -- I don't care about the actual data, I just want to move forward to the start of the next line. So the warnings are completely harmless. But I don't like my code to generate warnings, so I'll get it fixed in the next version and add Ubuntu 14.04 to my list of test systems. Thanks for reporting this! -- Sam Clippinger On Aug 19, 2015, at 5:42 AM, Arne Metzger via spamdyke-users spamdyke-users@spamdyke.org wrote: Hi, i am trying to make spamdyke on ubuntu 14.04. Make show several warnings ~/spamdyke-5.0.1/spamdyke# ./configure checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for stdint.h... (cached) yes checking sys/inttypes.h usability... no checking sys/inttypes.h presence... no checking for sys/inttypes.h... no checking for sys/types.h... (cached) yes checking for stdint.h... (cached) yes checking for sys/inttypes.h... (cached) no checking whether time.h and sys/time.h may both be included... yes checking for int16_t... no checking for int32_t... no checking for int64_t... no checking for uint16_t... no checking for uint32_t... no checking for uint64_t... no checking for dirent.h that defines DIR... yes checking for library containing opendir... none required checking for struct dirent.d_type... yes checking whether DT_WHT is declared... yes checking whether S_IFWHT is declared... no checking whether INADDR_LOOPBACK is declared... yes checking whether to include debugging symbols (for gdb)... no checking for strip... strip spamdyke checking whether to include excessive debugging output... no checking whether to include some debugging output... yes checking whether to compile with address sanitizer... no checking whether to include configuration tests... yes checking if openssl/ssl.h will include without additional include directories... yes checking for library containing RSA_sign... -lcrypto checking for library containing SSL_library_init... -lssl checking for OpenSSL libraries (for TLS support)... yes checking for library containing inet_aton... none required checking for library containing bind... none required checking for library containing inet_ntoa... none required checking for library containing getopt_long... none required checking whether anonymous inner functions are supported by default... yes checking whether struct option is defined in getopt.h... yes checking whether GCC diagnostic pragma directives are supported... yes checking whether pid_t is an unsigned int or an unsigned long... unsigned int checking whether uid_t is an unsigned int or an unsigned long... unsigned int checking whether gid_t is an unsigned int or an unsigned long... unsigned int checking whether time_t is an int or a long... long checking whether int64_ts are supported in a test program... yes checking whether printf()/scanf() uses %ld for 64-bit integers... yes checking whether __func__ is available... yes checking whether socklen_t is available... yes checking whether RLIMIT_AS is available... yes configure: creating ./config.status config.status: creating Makefile config.status: creating config.h config.status: config.h is unchanged ~/spamdyke-5.0.1/spamdyke# make gcc -Wall -O2 -funsigned-char -c spamdyke.c gcc -E -Wall -O2 -funsigned-char configuration.c | gcc -Wall -O2 -funsigned-char -x c -c -o configuration.o - gcc -Wall -O2 -funsigned-char -c dns.c gcc -Wall -O2 -funsigned-char -c environment.c gcc -Wall -O2 -funsigned-char -c usage.c gcc -Wall -O2 -funsigned-char -c search_fs.c search_fs.c: In function 'search_file': search_fs.c:347:15: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
[spamdyke-users] 5.0.1 - make warning fscanf on Ubuntu 14.04 LTS
Hi, i am trying to make spamdyke on ubuntu 14.04. Make show several warnings ~/spamdyke-5.0.1/spamdyke# ./configure checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for stdint.h... (cached) yes checking sys/inttypes.h usability... no checking sys/inttypes.h presence... no checking for sys/inttypes.h... no checking for sys/types.h... (cached) yes checking for stdint.h... (cached) yes checking for sys/inttypes.h... (cached) no checking whether time.h and sys/time.h may both be included... yes checking for int16_t... no checking for int32_t... no checking for int64_t... no checking for uint16_t... no checking for uint32_t... no checking for uint64_t... no checking for dirent.h that defines DIR... yes checking for library containing opendir... none required checking for struct dirent.d_type... yes checking whether DT_WHT is declared... yes checking whether S_IFWHT is declared... no checking whether INADDR_LOOPBACK is declared... yes checking whether to include debugging symbols (for gdb)... no checking for strip... strip spamdyke checking whether to include excessive debugging output... no checking whether to include some debugging output... yes checking whether to compile with address sanitizer... no checking whether to include configuration tests... yes checking if openssl/ssl.h will include without additional include directories... yes checking for library containing RSA_sign... -lcrypto checking for library containing SSL_library_init... -lssl checking for OpenSSL libraries (for TLS support)... yes checking for library containing inet_aton... none required checking for library containing bind... none required checking for library containing inet_ntoa... none required checking for library containing getopt_long... none required checking whether anonymous inner functions are supported by default... yes checking whether struct option is defined in getopt.h... yes checking whether GCC diagnostic pragma directives are supported... yes checking whether pid_t is an unsigned int or an unsigned long... unsigned int checking whether uid_t is an unsigned int or an unsigned long... unsigned int checking whether gid_t is an unsigned int or an unsigned long... unsigned int checking whether time_t is an int or a long... long checking whether int64_ts are supported in a test program... yes checking whether printf()/scanf() uses %ld for 64-bit integers... yes checking whether __func__ is available... yes checking whether socklen_t is available... yes checking whether RLIMIT_AS is available... yes configure: creating ./config.status config.status: creating Makefile config.status: creating config.h config.status: config.h is unchanged ~/spamdyke-5.0.1/spamdyke# make gcc -Wall -O2 -funsigned-char -c spamdyke.c gcc -E -Wall -O2 -funsigned-char configuration.c | gcc -Wall -O2 -funsigned-char -x c -c -o configuration.o - gcc -Wall -O2 -funsigned-char -c dns.c gcc -Wall -O2 -funsigned-char -c environment.c gcc -Wall -O2 -funsigned-char -c usage.c gcc -Wall -O2 -funsigned-char -c search_fs.c search_fs.c: In function 'search_file': search_fs.c:347:15: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(tmp_file, %*1[\r\n]); ^ search_fs.c: In function 'search_tcprules_file': search_fs.c:636:15: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(tmp_file, %*1[\r\n]); ^ search_fs.c: In function 'load_resolver_file': search_fs.c:820:15: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(tmp_file, %*1[\r\n]); ^ search_fs.c: In function 'read_file': search_fs.c:993:15: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(tmp_file, %*1[\r\n]); ^ search_fs.c: In function 'search_header_file': search_fs.c:1225:15: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(tmp_file, %*1[\r\n]); ^
Re: [spamdyke-users] 5.0.1 - make warning fscanf on Ubuntu 14.04 LTS
Hi Sam, thank you for this detailed answer. I will move forward and start to setup spamdyke on my new server - using it on a older one for years. Great code, thank you very much for the time and enegry you spent. Best regards, Arne Am 19.08.2015 um 16:09 schrieb Sam Clippinger via spamdyke-users: They're just warnings that I'm not checking the return value of a call to fscanf(). fscanf() reads data from a file into one or more variables; its return value shows how many variables were assigned. In the case of those lines, I'm using fscanf() to simply skip over any carriage return or newline characters at the end of a line and not assigning anything to any variables. That's why I'm not checking the return value -- I don't care about the actual data, I just want to move forward to the start of the next line. So the warnings are completely harmless. But I don't like my code to generate warnings, so I'll get it fixed in the next version and add Ubuntu 14.04 to my list of test systems. Thanks for reporting this! -- Sam Clippinger On Aug 19, 2015, at 5:42 AM, Arne Metzger via spamdyke-users spamdyke-users@spamdyke.org mailto:spamdyke-users@spamdyke.org wrote: Hi, i am trying to make spamdyke on ubuntu 14.04. Make show several warnings ~/spamdyke-5.0.1/spamdyke# ./configure checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for stdint.h... (cached) yes checking sys/inttypes.h usability... no checking sys/inttypes.h presence... no checking for sys/inttypes.h... no checking for sys/types.h... (cached) yes checking for stdint.h... (cached) yes checking for sys/inttypes.h... (cached) no checking whether time.h and sys/time.h may both be included... yes checking for int16_t... no checking for int32_t... no checking for int64_t... no checking for uint16_t... no checking for uint32_t... no checking for uint64_t... no checking for dirent.h that defines DIR... yes checking for library containing opendir... none required checking for struct dirent.d_type... yes checking whether DT_WHT is declared... yes checking whether S_IFWHT is declared... no checking whether INADDR_LOOPBACK is declared... yes checking whether to include debugging symbols (for gdb)... no checking for strip... strip spamdyke checking whether to include excessive debugging output... no checking whether to include some debugging output... yes checking whether to compile with address sanitizer... no checking whether to include configuration tests... yes checking if openssl/ssl.h will include without additional include directories... yes checking for library containing RSA_sign... -lcrypto checking for library containing SSL_library_init... -lssl checking for OpenSSL libraries (for TLS support)... yes checking for library containing inet_aton... none required checking for library containing bind... none required checking for library containing inet_ntoa... none required checking for library containing getopt_long... none required checking whether anonymous inner functions are supported by default... yes checking whether struct option is defined in getopt.h... yes checking whether GCC diagnostic pragma directives are supported... yes checking whether pid_t is an unsigned int or an unsigned long... unsigned int checking whether uid_t is an unsigned int or an unsigned long... unsigned int checking whether gid_t is an unsigned int or an unsigned long... unsigned int checking whether time_t is an int or a long... long checking whether int64_ts are supported in a test program... yes checking whether printf()/scanf() uses %ld for 64-bit integers... yes checking whether __func__ is available... yes checking whether socklen_t is available... yes checking whether RLIMIT_AS is available... yes configure: creating ./config.status config.status: creating Makefile config.status: creating config.h config.status: config.h is unchanged ~/spamdyke-5.0.1/spamdyke# make gcc -Wall -O2 -funsigned-char -c spamdyke.c gcc -E -Wall -O2 -funsigned-char configuration.c | gcc -Wall -O2 -funsigned-char -x c -c -o configuration.o - gcc -Wall -O2 -funsigned-char -c dns.c gcc -Wall -O2 -funsigned-char -c environment.c gcc -Wall -O2
