Advanced Programming in the UNIX® Environment

ptg10805159

Appendix A Function Prototypes 861

int getsockopt(intsockfd,intlevel,intoption,void *restrict val,

socklen_t *restrictlenp);

<sys/socket.h> p. 624

Returns: 0 if OK,−1 on error

struct

spwd *getspent(void);

<shadow.h> p. 182

Returns: pointer if OK,NULLon error

Platforms: Linux 3.2.0, Solaris 10

struct

spwd *getspnam(const char *name);

<shadow.h> p. 182

Returns: pointer if OK,NULLon error

Platforms: Linux 3.2.0, Solaris 10

int gettimeofday(struct timeval *restricttp,

void *restricttzp);

<sys/time.h> p. 190

Returns: 0 always

uid_t getuid(void);

<unistd.h> p. 228

Returns: real user ID of calling process

struct

tm *gmtime(const time_t *calptr);

<time.h> p. 192

Returns: pointer to broken-down time,NULLon error

int grantpt(intfd);

<stdlib.h> p. 723

Returns: 0 on success,−1 on error

uint32_t htonl(uint32_thostint32);

<arpa/inet.h> p. 594

Returns: 32-bit integer in network byte order

uint16_t htons(uint16_thostint16);

<arpa/inet.h> p. 594

Returns: 16-bit integer in network byte order