gcc - C #define causes Seg Fault? -


here function trying working on red hat 6..

and have little experience c, , using #define, i'm unsure portion trying do: sp->s_port = htons(sp->s_port); 

#ifdef __linux #define get_service_by_name(sp, service, protocol)                           \    char            gsbn_servbuf[hostbufferlength] = {0};                     \    struct servent  gsbn_sp;                                                  \    struct servent *gsbn_serv_result;                                         \    int             gsbn_s = 0;                                               \    gsbn_s = getservbyname_r(service,                                         \                        protocol,                                             \                        &gsbn_sp,                                             \                        gsbn_servbuf,                                         \                        sizeof(gsbn_servbuf),                                 \                        &gsbn_serv_result);                                   \    sp = gsbn_serv_result;                                                    \    sp->s_port = htons(sp->s_port);                                           \    if (sp && socket_debug) {                                                 \       printf("%s get_service_by_name - service: %s port: %d protocol: %s\n", \              get_timestamp(), sp->s_name, sp->s_port, sp->s_proto);          \        }                                                                         \    if (sp == null) {                                                         \       fprintf(stderr, "%s get_service_by_name - service %s not found.\n",    \               get_timestamp(), service);                                     \    } #else #define get_service_by_name(sp, service, protocol)                           \    char            gsbn_servbuf[hostbufferlength] = {0};                     \    struct servent  gsbn_serv_result;                                         \    sp = getservbyname_r(service,                                             \                        protocol,                                             \                        &gsbn_serv_result,                                    \                        gsbn_servbuf,                                         \                        sizeof(gsbn_servbuf));                                \    if (sp && socket_debug) {                                                 \       printf("%s get_service_by_name - service: %s port: %d protocol: %s\n", \              get_timestamp(), sp->s_name, sp->s_port, sp->s_proto);          \    }                                                                         \    if (sp == null) {                                                         \       fprintf(stderr, "%s get_service_by_name - service %s not found.\n",    \               get_timestamp(), service);                                     \    } #endif

this error getting:

according gdb getting seg fault @ function call:

get_service_by_name(sp, serv, prot);

here gdb output:

program received signal sigsegv, segmentation fault. [switching thread 0x456c6c90 (lwp 14645)] 0x420b1e69 in gi_get_port (serv=unhandled dwarf expression opcode 0x9c )     @ /home/user1/common/src/socket.c:282 282           get_service_by_name(sp, serv, prot); current language:  auto; c

here how function called:

int gi_get_port (char *serv, char *prot) /* obtain port named service */ {   int p, s;    /* data resolving service name socket description. */   struct servent *sp = null;    get_service_by_name(sp, serv, prot);    if (sp != null) {     p = sp->s_port;   } else {     p = -1;   };    return p; }

this code once preprocessor executed : 

int gi_get_port (char *serv, char *prot) /* obtain port named service */ {   int p, s;    /* data resolving service name socket description. */   struct servent *sp = null;    char            gsbn_servbuf[hostbufferlength] = {0};                         struct servent  gsbn_sp;                                                      struct servent *gsbn_serv_result;                                             int             gsbn_s = 0;                                                   gsbn_s = getservbyname_r(serv,                                                                 prot,                                                                     &gsbn_sp,                                                                     gsbn_servbuf,                                                                 sizeof(gsbn_servbuf),                                                         &gsbn_serv_result);                                       sp = gsbn_serv_result;                                                        sp->s_port = htons(sp->s_port);                                               if (sp && socket_debug) {                                                        printf("%s get_service_by_name - service: %s port: %d protocol: %s\n",               get_timestamp(), sp->s_name, sp->s_port, sp->s_proto);                  }                                                                             if (sp == null) {                                                                fprintf(stderr, "%s get_service_by_name - service %s not found.\n",                   get_timestamp(), serv);                                         }    if (sp != null) {     p = sp->s_port;   } else {     p = -1;   };    return p; }

as see, should checking 'sp' being 'null' before htons() on port.


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