ftrigw_notifyb_nosig.c (1643B)
1 /* ISC license. */ 2 3 #include <string.h> 4 #include <unistd.h> 5 #include <errno.h> 6 7 #include <skalibs/posixplz.h> 8 #include <skalibs/direntry.h> 9 #include <skalibs/allreadwrite.h> 10 #include <skalibs/djbunix.h> 11 12 #include <s6/ftrigw.h> 13 #include "ftrig1.h" 14 15 int ftrigw_notifyb_nosig (char const *path, char const *s, size_t len) 16 { 17 unsigned int i = 0 ; 18 DIR *dir = opendir(path) ; 19 if (!dir) return -1 ; 20 { 21 size_t pathlen = strlen(path) ; 22 char tmp[pathlen + FTRIG1_PREFIXLEN + 35] ; 23 memcpy(tmp, path, pathlen) ; 24 tmp[pathlen] = '/' ; 25 tmp[pathlen + FTRIG1_PREFIXLEN + 34] = 0 ; 26 for (;;) 27 { 28 direntry *d ; 29 int fd ; 30 errno = 0 ; 31 d = readdir(dir) ; 32 if (!d) break ; 33 if (strncmp(d->d_name, FTRIG1_PREFIX ":@", FTRIG1_PREFIXLEN + 2)) continue ; 34 if (strlen(d->d_name) != FTRIG1_PREFIXLEN + 33) continue ; 35 memcpy(tmp + pathlen + 1, d->d_name, FTRIG1_PREFIXLEN + 33) ; 36 fd = open_write(tmp) ; 37 if (fd == -1) 38 { 39 if (errno == ENXIO) unlink_void(tmp) ; 40 } 41 else 42 { 43 ssize_t r = fd_write(fd, s, len) ; 44 if ((r < 0) || (size_t)r < len) 45 { 46 if (errno == EPIPE) unlink_void(tmp) ; 47 /* what to do if EAGAIN ? full fifo -> fix the reader ! 48 There's a race condition in extreme cases though ; 49 but it's still better to be nonblocking - the writer 50 shouldn't get in trouble because of a bad reader. */ 51 fd_close(fd) ; 52 } 53 else 54 { 55 fd_close(fd) ; 56 i++ ; 57 } 58 } 59 } 60 } 61 dir_close(dir) ; 62 return errno ? -1 : (int)i ; 63 }