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, int flag)
  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         return xmemdupz(str, p ? p - str : len);
  63 }
  64
  65 void *xrealloc(void *ptr, size_t size)
  66 {
  67         void *ret = realloc(ptr, size);
  68         if (!ret && !size)
  69                 ret = realloc(ptr, 1);
  70         if (!ret) {
  71                 release_pack_memory(size, -1);
  72                 ret = realloc(ptr, size);
  73                 if (!ret && !size)
  74                         ret = realloc(ptr, 1);
  75                 if (!ret)
  76                         die("Out of memory, realloc failed");
  77         }
  78         return ret;
  79 }
  80
  81 void *xcalloc(size_t nmemb, size_t size)
  82 {
  83         void *ret = calloc(nmemb, size);
  84         if (!ret && (!nmemb || !size))
  85                 ret = calloc(1, 1);
  86         if (!ret) {
  87                 release_pack_memory(nmemb * size, -1);
  88                 ret = calloc(nmemb, size);
  89                 if (!ret && (!nmemb || !size))
  90                         ret = calloc(1, 1);
  91                 if (!ret)
  92                         die("Out of memory, calloc failed");
  93         }
  94         return ret;
  95 }
  96
  97 void *xmmap(void *start, size_t length,
  98         int prot, int flags, int fd, off_t offset)
  99 {
 100         void *ret = mmap(start, length, prot, flags, fd, offset);
 101         if (ret == MAP_FAILED) {
 102                 if (!length)
 103                         return NULL;
 104                 release_pack_memory(length, fd);
 105                 ret = mmap(start, length, prot, flags, fd, offset);
 106                 if (ret == MAP_FAILED)
 107                         die("Out of memory? mmap failed: %s", strerror(errno));
 108         }
 109         return ret;
 110 }
 111
 112 /*
 113  * xread() is the same a read(), but it automatically restarts read()
 114  * operations with a recoverable error (EAGAIN and EINTR). xread()
 115  * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 116  */
 117 ssize_t xread(int fd, void *buf, size_t len)
 118 {
 119         ssize_t nr;
 120         while (1) {
 121                 nr = read(fd, buf, len);
 122                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 123                         continue;
 124                 return nr;
 125         }
 126 }
 127
 128 /*
 129  * xwrite() is the same a write(), but it automatically restarts write()
 130  * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 131  * GUARANTEE that "len" bytes is written even if the operation is successful.
 132  */
 133 ssize_t xwrite(int fd, const void *buf, size_t len)
 134 {
 135         ssize_t nr;
 136         while (1) {
 137                 nr = write(fd, buf, len);
 138                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 139                         continue;
 140                 return nr;
 141         }
 142 }
 143
 144 ssize_t read_in_full(int fd, void *buf, size_t count)
 145 {
 146         char *p = buf;
 147         ssize_t total = 0;
 148
 149         while (count > 0) {
 150                 ssize_t loaded = xread(fd, p, count);
 151                 if (loaded <= 0)
 152                         return total ? total : loaded;
 153                 count -= loaded;
 154                 p += loaded;
 155                 total += loaded;
 156         }
 157
 158         return total;
 159 }
 160
 161 ssize_t write_in_full(int fd, const void *buf, size_t count)
 162 {
 163         const char *p = buf;
 164         ssize_t total = 0;
 165
 166         while (count > 0) {
 167                 ssize_t written = xwrite(fd, p, count);
 168                 if (written < 0)
 169                         return -1;
 170                 if (!written) {
 171                         errno = ENOSPC;
 172                         return -1;
 173                 }
 174                 count -= written;
 175                 p += written;
 176                 total += written;
 177         }
 178
 179         return total;
 180 }
 181
 182 int xdup(int fd)
 183 {
 184         int ret = dup(fd);
 185         if (ret < 0)
 186                 die("dup failed: %s", strerror(errno));
 187         return ret;
 188 }
 189
 190 FILE *xfdopen(int fd, const char *mode)
 191 {
 192         FILE *stream = fdopen(fd, mode);
 193         if (stream == NULL)
 194                 die("Out of memory? fdopen failed: %s", strerror(errno));
 195         return stream;
 196 }
 197
 198 int xmkstemp(char *template)
 199 {
 200         int fd;
 201
 202         fd = mkstemp(template);
 203         if (fd < 0)
 204                 die("Unable to create temporary file: %s", strerror(errno));
 205         return fd;
 206 }