mirror of
https://github.com/git/git.git
synced 2024-10-31 14:27:54 +01:00
00b0d7f77b
This way, the next caller that wants to disable our memory reclamation machinery does not have to define its own do_nothing() stub. Signed-off-by: Junio C Hamano <gitster@pobox.com>
357 lines
7.4 KiB
C
357 lines
7.4 KiB
C
/*
|
|
* Various trivial helper wrappers around standard functions
|
|
*/
|
|
#include "cache.h"
|
|
|
|
static void do_nothing(size_t size)
|
|
{
|
|
}
|
|
|
|
static void (*try_to_free_routine)(size_t size) = do_nothing;
|
|
|
|
try_to_free_t set_try_to_free_routine(try_to_free_t routine)
|
|
{
|
|
try_to_free_t old = try_to_free_routine;
|
|
if (!routine)
|
|
routine = do_nothing;
|
|
try_to_free_routine = routine;
|
|
return old;
|
|
}
|
|
|
|
char *xstrdup(const char *str)
|
|
{
|
|
char *ret = strdup(str);
|
|
if (!ret) {
|
|
try_to_free_routine(strlen(str) + 1);
|
|
ret = strdup(str);
|
|
if (!ret)
|
|
die("Out of memory, strdup failed");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void *xmalloc(size_t size)
|
|
{
|
|
void *ret = malloc(size);
|
|
if (!ret && !size)
|
|
ret = malloc(1);
|
|
if (!ret) {
|
|
try_to_free_routine(size);
|
|
ret = malloc(size);
|
|
if (!ret && !size)
|
|
ret = malloc(1);
|
|
if (!ret)
|
|
die("Out of memory, malloc failed (tried to allocate %lu bytes)",
|
|
(unsigned long)size);
|
|
}
|
|
#ifdef XMALLOC_POISON
|
|
memset(ret, 0xA5, size);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
void *xmallocz(size_t size)
|
|
{
|
|
void *ret;
|
|
if (size + 1 < size)
|
|
die("Data too large to fit into virtual memory space.");
|
|
ret = xmalloc(size + 1);
|
|
((char*)ret)[size] = 0;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
|
|
* "data" to the allocated memory, zero terminates the allocated memory,
|
|
* and returns a pointer to the allocated memory. If the allocation fails,
|
|
* the program dies.
|
|
*/
|
|
void *xmemdupz(const void *data, size_t len)
|
|
{
|
|
return memcpy(xmallocz(len), data, len);
|
|
}
|
|
|
|
char *xstrndup(const char *str, size_t len)
|
|
{
|
|
char *p = memchr(str, '\0', len);
|
|
return xmemdupz(str, p ? p - str : len);
|
|
}
|
|
|
|
void *xrealloc(void *ptr, size_t size)
|
|
{
|
|
void *ret = realloc(ptr, size);
|
|
if (!ret && !size)
|
|
ret = realloc(ptr, 1);
|
|
if (!ret) {
|
|
try_to_free_routine(size);
|
|
ret = realloc(ptr, size);
|
|
if (!ret && !size)
|
|
ret = realloc(ptr, 1);
|
|
if (!ret)
|
|
die("Out of memory, realloc failed");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void *xcalloc(size_t nmemb, size_t size)
|
|
{
|
|
void *ret = calloc(nmemb, size);
|
|
if (!ret && (!nmemb || !size))
|
|
ret = calloc(1, 1);
|
|
if (!ret) {
|
|
try_to_free_routine(nmemb * size);
|
|
ret = calloc(nmemb, size);
|
|
if (!ret && (!nmemb || !size))
|
|
ret = calloc(1, 1);
|
|
if (!ret)
|
|
die("Out of memory, calloc failed");
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* xread() is the same a read(), but it automatically restarts read()
|
|
* operations with a recoverable error (EAGAIN and EINTR). xread()
|
|
* DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
|
|
*/
|
|
ssize_t xread(int fd, void *buf, size_t len)
|
|
{
|
|
ssize_t nr;
|
|
while (1) {
|
|
nr = read(fd, buf, len);
|
|
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
|
|
continue;
|
|
return nr;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* xwrite() is the same a write(), but it automatically restarts write()
|
|
* operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
|
|
* GUARANTEE that "len" bytes is written even if the operation is successful.
|
|
*/
|
|
ssize_t xwrite(int fd, const void *buf, size_t len)
|
|
{
|
|
ssize_t nr;
|
|
while (1) {
|
|
nr = write(fd, buf, len);
|
|
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
|
|
continue;
|
|
return nr;
|
|
}
|
|
}
|
|
|
|
ssize_t read_in_full(int fd, void *buf, size_t count)
|
|
{
|
|
char *p = buf;
|
|
ssize_t total = 0;
|
|
|
|
while (count > 0) {
|
|
ssize_t loaded = xread(fd, p, count);
|
|
if (loaded <= 0)
|
|
return total ? total : loaded;
|
|
count -= loaded;
|
|
p += loaded;
|
|
total += loaded;
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
ssize_t write_in_full(int fd, const void *buf, size_t count)
|
|
{
|
|
const char *p = buf;
|
|
ssize_t total = 0;
|
|
|
|
while (count > 0) {
|
|
ssize_t written = xwrite(fd, p, count);
|
|
if (written < 0)
|
|
return -1;
|
|
if (!written) {
|
|
errno = ENOSPC;
|
|
return -1;
|
|
}
|
|
count -= written;
|
|
p += written;
|
|
total += written;
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
int xdup(int fd)
|
|
{
|
|
int ret = dup(fd);
|
|
if (ret < 0)
|
|
die_errno("dup failed");
|
|
return ret;
|
|
}
|
|
|
|
FILE *xfdopen(int fd, const char *mode)
|
|
{
|
|
FILE *stream = fdopen(fd, mode);
|
|
if (stream == NULL)
|
|
die_errno("Out of memory? fdopen failed");
|
|
return stream;
|
|
}
|
|
|
|
int xmkstemp(char *template)
|
|
{
|
|
int fd;
|
|
|
|
fd = mkstemp(template);
|
|
if (fd < 0)
|
|
die_errno("Unable to create temporary file");
|
|
return fd;
|
|
}
|
|
|
|
/* git_mkstemp() - create tmp file honoring TMPDIR variable */
|
|
int git_mkstemp(char *path, size_t len, const char *template)
|
|
{
|
|
const char *tmp;
|
|
size_t n;
|
|
|
|
tmp = getenv("TMPDIR");
|
|
if (!tmp)
|
|
tmp = "/tmp";
|
|
n = snprintf(path, len, "%s/%s", tmp, template);
|
|
if (len <= n) {
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
return mkstemp(path);
|
|
}
|
|
|
|
/* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */
|
|
int git_mkstemps(char *path, size_t len, const char *template, int suffix_len)
|
|
{
|
|
const char *tmp;
|
|
size_t n;
|
|
|
|
tmp = getenv("TMPDIR");
|
|
if (!tmp)
|
|
tmp = "/tmp";
|
|
n = snprintf(path, len, "%s/%s", tmp, template);
|
|
if (len <= n) {
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
return mkstemps(path, suffix_len);
|
|
}
|
|
|
|
/* Adapted from libiberty's mkstemp.c. */
|
|
|
|
#undef TMP_MAX
|
|
#define TMP_MAX 16384
|
|
|
|
int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
|
|
{
|
|
static const char letters[] =
|
|
"abcdefghijklmnopqrstuvwxyz"
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
"0123456789";
|
|
static const int num_letters = 62;
|
|
uint64_t value;
|
|
struct timeval tv;
|
|
char *template;
|
|
size_t len;
|
|
int fd, count;
|
|
|
|
len = strlen(pattern);
|
|
|
|
if (len < 6 + suffix_len) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Replace pattern's XXXXXX characters with randomness.
|
|
* Try TMP_MAX different filenames.
|
|
*/
|
|
gettimeofday(&tv, NULL);
|
|
value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
|
|
template = &pattern[len - 6 - suffix_len];
|
|
for (count = 0; count < TMP_MAX; ++count) {
|
|
uint64_t v = value;
|
|
/* Fill in the random bits. */
|
|
template[0] = letters[v % num_letters]; v /= num_letters;
|
|
template[1] = letters[v % num_letters]; v /= num_letters;
|
|
template[2] = letters[v % num_letters]; v /= num_letters;
|
|
template[3] = letters[v % num_letters]; v /= num_letters;
|
|
template[4] = letters[v % num_letters]; v /= num_letters;
|
|
template[5] = letters[v % num_letters]; v /= num_letters;
|
|
|
|
fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
|
|
if (fd > 0)
|
|
return fd;
|
|
/*
|
|
* Fatal error (EPERM, ENOSPC etc).
|
|
* It doesn't make sense to loop.
|
|
*/
|
|
if (errno != EEXIST)
|
|
break;
|
|
/*
|
|
* This is a random value. It is only necessary that
|
|
* the next TMP_MAX values generated by adding 7777 to
|
|
* VALUE are different with (module 2^32).
|
|
*/
|
|
value += 7777;
|
|
}
|
|
/* We return the null string if we can't find a unique file name. */
|
|
pattern[0] = '\0';
|
|
return -1;
|
|
}
|
|
|
|
int git_mkstemp_mode(char *pattern, int mode)
|
|
{
|
|
/* mkstemp is just mkstemps with no suffix */
|
|
return git_mkstemps_mode(pattern, 0, mode);
|
|
}
|
|
|
|
int gitmkstemps(char *pattern, int suffix_len)
|
|
{
|
|
return git_mkstemps_mode(pattern, suffix_len, 0600);
|
|
}
|
|
|
|
int xmkstemp_mode(char *template, int mode)
|
|
{
|
|
int fd;
|
|
|
|
fd = git_mkstemp_mode(template, mode);
|
|
if (fd < 0)
|
|
die_errno("Unable to create temporary file");
|
|
return fd;
|
|
}
|
|
|
|
static int warn_if_unremovable(const char *op, const char *file, int rc)
|
|
{
|
|
if (rc < 0) {
|
|
int err = errno;
|
|
if (ENOENT != err) {
|
|
warning("unable to %s %s: %s",
|
|
op, file, strerror(errno));
|
|
errno = err;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int unlink_or_warn(const char *file)
|
|
{
|
|
return warn_if_unremovable("unlink", file, unlink(file));
|
|
}
|
|
|
|
int rmdir_or_warn(const char *file)
|
|
{
|
|
return warn_if_unremovable("rmdir", file, rmdir(file));
|
|
}
|
|
|
|
int remove_or_warn(unsigned int mode, const char *file)
|
|
{
|
|
return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
|
|
}
|