Advanced Programming in the UNIX® Environment

ptg10805159

Appendix A Function Prototypes 877

int putchar_unlocked(intc);

<stdio.h> p. 444

Returns:cif OK,EOFon error

int putc_unlocked(intc,FILE *fp);

<stdio.h> p. 444

Returns:cif OK,EOFon error

int putenv(char *str);

<stdlib.h> p. 212

Returns: 0 if OK, nonzero on error

int puts(const char *str);

<stdio.h> p. 153

Returns: non-negative value if OK,EOFon error

ssize_t pwrite(intfd,const void *buf,size_tnbytes,off_toffset);

<unistd.h> p. 78

Returns: number of bytes written if OK,−1 on error

int raise(intsigno);

<signal.h> p. 337

Returns: 0 if OK, nonzero on error

ssize_t read(intfd,void *buf,size_tnbytes);

<unistd.h> p. 71

Returns: number of bytes read if OK, 0 if end of file,

−1 on error

struct

dirent *readdir(DIR *dp);

<dirent.h> p. 130

Returns: pointer if OK,NULLat end of directory or error

ssize_t readlink(const char *restrictpath,char *restrictbuf,

size_tbufsize);

<unistd.h> p. 123

Returns: number of bytes read if OK,−1 on error

ssize_t readlinkat(intfd,const char* restrictpath,

char *restrictbuf,size_tbufsize);

<unistd.h> p. 123

Returns: number of bytes read if OK,−1 on error

ssize_t readv(intfd,const struct iovec *iov,intiovcnt);

<sys/uio.h> p. 521

Returns: number of bytes read if OK, 0 if end of file,

−1 on error