tail.c File Reference

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <tail.h>

Include dependency graph for tail.c:

Go to the source code of this file.

Data Structures
struct	_tail
Typedefs
typedef _tail	tail_t
Functions
static int	_tail (tail_t *t, char *buf, size_t bufsz)
int	addtailsource (char *filename)
int	taildata (char **filename, char *buf, size_t bufsz)
void	tailsleep (unsigned long sleep)
Variables
static tail_t *	tails = NULL
static int	tcnt = 0
static int	tp = 0

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Typedef Documentation

typedef struct _tail tail_t

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Function Documentation

static int _tail (  tail_t *  t, char *  buf, size_t  bufsz )  [static]

_tail does the real work. If the tail pointer's fd is -1, the file is opened and seeked to EOF and the EOF pos is stored. On error -1 is returned and errno is set. Definition at line 67 of file tail.c. References _tail::fd, _tail::filename, and _tail::pos. Referenced by addtailsource(), and taildata(). { char c; int i; if(t->fd == -1) { struct stat _st, *st = &_st; if((t->fd = open(t->filename,O_RDONLY)) == -1) return -1; if(fstat(t->fd,st) == -1) { close(t->fd); return -1; } t->pos = st->st_size; lseek(t->fd,0,SEEK_END); return 0; } for(i = 0, c=-1; c != '\0';) { if(read(t->fd, &c,1)>0) { buf[i++] = c; buf[i] = '\0'; if(c == '\n' || i >= bufsz) break; } else break; } return i; }

int addtailsource (  char *  filename  )

addtailsource opens and seeks to EOF the specified file. The file descriptor and position offset is saved. If an error occurs errno is set and addtailsource returns -1 otherwise it returns 0. Definition at line 36 of file tail.c. References _tail(), tails, tcnt, and tp. Referenced by main(). { int tp; tail_t _t = {"",-1,-1}, *t = &_t, *a; strcpy(t->filename,filename); if(_tail(t,NULL,-1)) return -1; tp = tcnt ++; if((tails = realloc(tails,(sizeof(tail_t)*(tcnt)))) == NULL) { close(t->fd); return -1; } tails[tp] = *t; return 0; } Here is the call graph for this function:

int taildata (  char **  filename, char *  buf, size_t  bufsz )

taildata returns the next available line from a tail-file. The filename read from is stored in filename. buf will contain the data read upto bufsz bytes. Definition at line 54 of file tail.c. References _tail(), _tail::filename, tails, tcnt, and tp. Referenced by secwatch(). { int cnt; tail_t * t = &tails[tp++]; if(tp >= tcnt) tp = 0; cnt = _tail(t,buf,bufsz); *filename = &t->filename[0]; return cnt; } Here is the call graph for this function:

void tailsleep (  unsigned long  sleep  )

tailsleep suspends execution for sleep number of milliseconds. Definition at line 96 of file tail.c. Referenced by secwatch(). { struct timespec ts = {0,(sleep*1000000)}; nanosleep(&ts,NULL); }

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Variable Documentation

tail_t* tails = NULL [static]

Definition at line 25 of file tail.c. Referenced by addtailsource(), and taildata().

int tcnt = 0 [static]

Definition at line 26 of file tail.c. Referenced by addtailsource(), and taildata().

int tp = 0 [static]

Definition at line 27 of file tail.c. Referenced by addtailsource(), and taildata().

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