1 /* 2 * Copyright (C) 2014, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 3 * 4 * Released under the GPL v2. (and only v2, not any later version) 5 */ 6 #include "array.h" 7 #include <errno.h> 8 #include <fcntl.h> 9 #include <poll.h> 10 #include <stdlib.h> 11 #include <unistd.h> 12 13 void fdarray__init(struct fdarray *fda, int nr_autogrow) 14 { 15 fda->entries = NULL; 16 fda->priv = NULL; 17 fda->nr = fda->nr_alloc = 0; 18 fda->nr_autogrow = nr_autogrow; 19 } 20 21 int fdarray__grow(struct fdarray *fda, int nr) 22 { 23 void *priv; 24 int nr_alloc = fda->nr_alloc + nr; 25 size_t psize = sizeof(fda->priv[0]) * nr_alloc; 26 size_t size = sizeof(struct pollfd) * nr_alloc; 27 struct pollfd *entries = realloc(fda->entries, size); 28 29 if (entries == NULL) 30 return -ENOMEM; 31 32 priv = realloc(fda->priv, psize); 33 if (priv == NULL) { 34 free(entries); 35 return -ENOMEM; 36 } 37 38 fda->nr_alloc = nr_alloc; 39 fda->entries = entries; 40 fda->priv = priv; 41 return 0; 42 } 43 44 struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow) 45 { 46 struct fdarray *fda = calloc(1, sizeof(*fda)); 47 48 if (fda != NULL) { 49 if (fdarray__grow(fda, nr_alloc)) { 50 free(fda); 51 fda = NULL; 52 } else { 53 fda->nr_autogrow = nr_autogrow; 54 } 55 } 56 57 return fda; 58 } 59 60 void fdarray__exit(struct fdarray *fda) 61 { 62 free(fda->entries); 63 free(fda->priv); 64 fdarray__init(fda, 0); 65 } 66 67 void fdarray__delete(struct fdarray *fda) 68 { 69 fdarray__exit(fda); 70 free(fda); 71 } 72 73 int fdarray__add(struct fdarray *fda, int fd, short revents) 74 { 75 int pos = fda->nr; 76 77 if (fda->nr == fda->nr_alloc && 78 fdarray__grow(fda, fda->nr_autogrow) < 0) 79 return -ENOMEM; 80 81 fda->entries[fda->nr].fd = fd; 82 fda->entries[fda->nr].events = revents; 83 fda->nr++; 84 return pos; 85 } 86 87 int fdarray__filter(struct fdarray *fda, short revents, 88 void (*entry_destructor)(struct fdarray *fda, int fd)) 89 { 90 int fd, nr = 0; 91 92 if (fda->nr == 0) 93 return 0; 94 95 for (fd = 0; fd < fda->nr; ++fd) { 96 if (fda->entries[fd].revents & revents) { 97 if (entry_destructor) 98 entry_destructor(fda, fd); 99 100 continue; 101 } 102 103 if (fd != nr) { 104 fda->entries[nr] = fda->entries[fd]; 105 fda->priv[nr] = fda->priv[fd]; 106 } 107 108 ++nr; 109 } 110 111 return fda->nr = nr; 112 } 113 114 int fdarray__poll(struct fdarray *fda, int timeout) 115 { 116 return poll(fda->entries, fda->nr, timeout); 117 } 118 119 int fdarray__fprintf(struct fdarray *fda, FILE *fp) 120 { 121 int fd, printed = fprintf(fp, "%d [ ", fda->nr); 122 123 for (fd = 0; fd < fda->nr; ++fd) 124 printed += fprintf(fp, "%s%d", fd ? ", " : "", fda->entries[fd].fd); 125 126 return printed + fprintf(fp, " ]"); 127 } 128