tools/perf/util/wrapper.c

   1 /*
   2  * Various trivial helper wrappers around standard functions
   3  */
   4 #include "cache.h"
   5
   6 /*
   7  * There's no pack memory to release - but stay close to the Git
   8  * version so wrap this away:
   9  */
  10 static inline void release_pack_memory(size_t size __used, int flag __used)
  11 {
  12 }
  13
  14 char *xstrdup(const char *str)
  15 {
  16         char *ret = strdup(str);
  17         if (!ret) {
  18                 release_pack_memory(strlen(str) + 1, -1);
  19                 ret = strdup(str);
  20                 if (!ret)
  21                         die("Out of memory, strdup failed");
  22         }
  23         return ret;
  24 }
  25
  26 void *xmalloc(size_t size)
  27 {
  28         void *ret = malloc(size);
  29         if (!ret && !size)
  30                 ret = malloc(1);
  31         if (!ret) {
  32                 release_pack_memory(size, -1);
  33                 ret = malloc(size);
  34                 if (!ret && !size)
  35                         ret = malloc(1);
  36                 if (!ret)
  37                         die("Out of memory, malloc failed");
  38         }
  39 #ifdef XMALLOC_POISON
  40         memset(ret, 0xA5, size);
  41 #endif
  42         return ret;
  43 }
  44
  45 /*
  46  * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
  47  * "data" to the allocated memory, zero terminates the allocated memory,
  48  * and returns a pointer to the allocated memory. If the allocation fails,
  49  * the program dies.
  50  */
  51 void *xmemdupz(const void *data, size_t len)
  52 {
  53         char *p = xmalloc(len + 1);
  54         memcpy(p, data, len);
  55         p[len] = '\0';
  56         return p;
  57 }
  58
  59 char *xstrndup(const char *str, size_t len)
  60 {
  61         char *p = memchr(str, '\0', len);
  62
  63         return xmemdupz(str, p ? (size_t)(p - str) : len);
  64 }
  65
  66 void *xrealloc(void *ptr, size_t size)
  67 {
  68         void *ret = realloc(ptr, size);
  69         if (!ret && !size)
  70                 ret = realloc(ptr, 1);
  71         if (!ret) {
  72                 release_pack_memory(size, -1);
  73                 ret = realloc(ptr, size);
  74                 if (!ret && !size)
  75                         ret = realloc(ptr, 1);
  76                 if (!ret)
  77                         die("Out of memory, realloc failed");
  78         }
  79         return ret;
  80 }
  81
  82 void *xcalloc(size_t nmemb, size_t size)
  83 {
  84         void *ret = calloc(nmemb, size);
  85         if (!ret && (!nmemb || !size))
  86                 ret = calloc(1, 1);
  87         if (!ret) {
  88                 release_pack_memory(nmemb * size, -1);
  89                 ret = calloc(nmemb, size);
  90                 if (!ret && (!nmemb || !size))
  91                         ret = calloc(1, 1);
  92                 if (!ret)
  93                         die("Out of memory, calloc failed");
  94         }
  95         return ret;
  96 }
  97
  98 void *xmmap(void *start, size_t length,
  99         int prot, int flags, int fd, off_t offset)
 100 {
 101         void *ret = mmap(start, length, prot, flags, fd, offset);
 102         if (ret == MAP_FAILED) {
 103                 if (!length)
 104                         return NULL;
 105                 release_pack_memory(length, fd);
 106                 ret = mmap(start, length, prot, flags, fd, offset);
 107                 if (ret == MAP_FAILED)
 108                         die("Out of memory? mmap failed: %s", strerror(errno));
 109         }
 110         return ret;
 111 }
 112
 113 /*
 114  * xread() is the same a read(), but it automatically restarts read()
 115  * operations with a recoverable error (EAGAIN and EINTR). xread()
 116  * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 117  */
 118 ssize_t xread(int fd, void *buf, size_t len)
 119 {
 120         ssize_t nr;
 121         while (1) {
 122                 nr = read(fd, buf, len);
 123                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 124                         continue;
 125                 return nr;
 126         }
 127 }
 128
 129 /*
 130  * xwrite() is the same a write(), but it automatically restarts write()
 131  * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 132  * GUARANTEE that "len" bytes is written even if the operation is successful.
 133  */
 134 ssize_t xwrite(int fd, const void *buf, size_t len)
 135 {
 136         ssize_t nr;
 137         while (1) {
 138                 nr = write(fd, buf, len);
 139                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 140                         continue;
 141                 return nr;
 142         }
 143 }
 144
 145 ssize_t read_in_full(int fd, void *buf, size_t count)
 146 {
 147         char *p = buf;
 148         ssize_t total = 0;
 149
 150         while (count > 0) {
 151                 ssize_t loaded = xread(fd, p, count);
 152                 if (loaded <= 0)
 153                         return total ? total : loaded;
 154                 count -= loaded;
 155                 p += loaded;
 156                 total += loaded;
 157         }
 158
 159         return total;
 160 }
 161
 162 ssize_t write_in_full(int fd, const void *buf, size_t count)
 163 {
 164         const char *p = buf;
 165         ssize_t total = 0;
 166
 167         while (count > 0) {
 168                 ssize_t written = xwrite(fd, p, count);
 169                 if (written < 0)
 170                         return -1;
 171                 if (!written) {
 172                         errno = ENOSPC;
 173                         return -1;
 174                 }
 175                 count -= written;
 176                 p += written;
 177                 total += written;
 178         }
 179
 180         return total;
 181 }
 182
 183 int xdup(int fd)
 184 {
 185         int ret = dup(fd);
 186         if (ret < 0)
 187                 die("dup failed: %s", strerror(errno));
 188         return ret;
 189 }
 190
 191 FILE *xfdopen(int fd, const char *mode)
 192 {
 193         FILE *stream = fdopen(fd, mode);
 194         if (stream == NULL)
 195                 die("Out of memory? fdopen failed: %s", strerror(errno));
 196         return stream;
 197 }
 198
 199 int xmkstemp(char *template)
 200 {
 201         int fd;
 202
 203         fd = mkstemp(template);
 204         if (fd < 0)
 205                 die("Unable to create temporary file: %s", strerror(errno));
 206         return fd;
 207 }