* Various trivial helper wrappers around standard functions
*/
#include "cache.h"
+#include "config.h"
static void do_nothing(size_t size)
{
static void (*try_to_free_routine)(size_t size) = do_nothing;
-static void memory_limit_check(size_t size)
+static int memory_limit_check(size_t size, int gentle)
{
- static int limit = -1;
- if (limit == -1) {
- const char *env = getenv("GIT_ALLOC_LIMIT");
- limit = env ? atoi(env) * 1024 : 0;
+ static size_t limit = 0;
+ if (!limit) {
+ limit = git_env_ulong("GIT_ALLOC_LIMIT", 0);
+ if (!limit)
+ limit = SIZE_MAX;
}
- if (limit && size > limit)
- die("attempting to allocate %"PRIuMAX" over limit %d",
- (intmax_t)size, limit);
+ if (size > limit) {
+ if (gentle) {
+ error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
+ (uintmax_t)size, (uintmax_t)limit);
+ return -1;
+ } else
+ die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
+ (uintmax_t)size, (uintmax_t)limit);
+ }
+ return 0;
}
try_to_free_t set_try_to_free_routine(try_to_free_t routine)
return ret;
}
-void *xmalloc(size_t size)
+static void *do_xmalloc(size_t size, int gentle)
{
void *ret;
- memory_limit_check(size);
+ if (memory_limit_check(size, gentle))
+ return NULL;
ret = malloc(size);
if (!ret && !size)
ret = malloc(1);
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);
+ if (!ret) {
+ if (!gentle)
+ die("Out of memory, malloc failed (tried to allocate %lu bytes)",
+ (unsigned long)size);
+ else {
+ error("Out of memory, malloc failed (tried to allocate %lu bytes)",
+ (unsigned long)size);
+ return NULL;
+ }
+ }
}
#ifdef XMALLOC_POISON
memset(ret, 0xA5, size);
return ret;
}
-void *xmallocz(size_t size)
+void *xmalloc(size_t size)
+{
+ return do_xmalloc(size, 0);
+}
+
+static void *do_xmallocz(size_t size, int gentle)
{
void *ret;
- if (unsigned_add_overflows(size, 1))
- die("Data too large to fit into virtual memory space.");
- ret = xmalloc(size + 1);
- ((char*)ret)[size] = 0;
+ if (unsigned_add_overflows(size, 1)) {
+ if (gentle) {
+ error("Data too large to fit into virtual memory space.");
+ return NULL;
+ } else
+ die("Data too large to fit into virtual memory space.");
+ }
+ ret = do_xmalloc(size + 1, gentle);
+ if (ret)
+ ((char*)ret)[size] = 0;
return ret;
}
+void *xmallocz(size_t size)
+{
+ return do_xmallocz(size, 0);
+}
+
+void *xmallocz_gently(size_t size)
+{
+ return do_xmallocz(size, 1);
+}
+
/*
* xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
* "data" to the allocated memory, zero terminates the allocated memory,
{
void *ret;
- memory_limit_check(size);
+ memory_limit_check(size, 0);
ret = realloc(ptr, size);
if (!ret && !size)
ret = realloc(ptr, 1);
{
void *ret;
- memory_limit_check(size * nmemb);
+ if (unsigned_mult_overflows(nmemb, size))
+ die("data too large to fit into virtual memory space");
+
+ memory_limit_check(size * nmemb, 0);
ret = calloc(nmemb, size);
if (!ret && (!nmemb || !size))
ret = calloc(1, 1);
}
/*
+ * Limit size of IO chunks, because huge chunks only cause pain. OS X
+ * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in
+ * the absence of bugs, large chunks can result in bad latencies when
+ * you decide to kill the process.
+ *
+ * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX
+ * that is smaller than that, clip it to SSIZE_MAX, as a call to
+ * read(2) or write(2) larger than that is allowed to fail. As the last
+ * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value"
+ * to override this, if the definition of SSIZE_MAX given by the platform
+ * is broken.
+ */
+#ifndef MAX_IO_SIZE
+# define MAX_IO_SIZE_DEFAULT (8*1024*1024)
+# if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT)
+# define MAX_IO_SIZE SSIZE_MAX
+# else
+# define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT
+# endif
+#endif
+
+/**
+ * xopen() is the same as open(), but it die()s if the open() fails.
+ */
+int xopen(const char *path, int oflag, ...)
+{
+ mode_t mode = 0;
+ va_list ap;
+
+ /*
+ * va_arg() will have undefined behavior if the specified type is not
+ * compatible with the argument type. Since integers are promoted to
+ * ints, we fetch the next argument as an int, and then cast it to a
+ * mode_t to avoid undefined behavior.
+ */
+ va_start(ap, oflag);
+ if (oflag & O_CREAT)
+ mode = va_arg(ap, int);
+ va_end(ap);
+
+ for (;;) {
+ int fd = open(path, oflag, mode);
+ if (fd >= 0)
+ return fd;
+ if (errno == EINTR)
+ continue;
+
+ if ((oflag & O_RDWR) == O_RDWR)
+ die_errno(_("could not open '%s' for reading and writing"), path);
+ else if ((oflag & O_WRONLY) == O_WRONLY)
+ die_errno(_("could not open '%s' for writing"), path);
+ else
+ die_errno(_("could not open '%s' for reading"), path);
+ }
+}
+
+static int handle_nonblock(int fd, short poll_events, int err)
+{
+ struct pollfd pfd;
+
+ if (err != EAGAIN && err != EWOULDBLOCK)
+ return 0;
+
+ pfd.fd = fd;
+ pfd.events = poll_events;
+
+ /*
+ * no need to check for errors, here;
+ * a subsequent read/write will detect unrecoverable errors
+ */
+ poll(&pfd, 1, -1);
+ return 1;
+}
+
+/*
* 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;
+ if (len > MAX_IO_SIZE)
+ len = MAX_IO_SIZE;
while (1) {
nr = read(fd, buf, len);
- if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
- continue;
+ if (nr < 0) {
+ if (errno == EINTR)
+ continue;
+ if (handle_nonblock(fd, POLLIN, errno))
+ continue;
+ }
return nr;
}
}
ssize_t xwrite(int fd, const void *buf, size_t len)
{
ssize_t nr;
+ if (len > MAX_IO_SIZE)
+ len = MAX_IO_SIZE;
while (1) {
nr = write(fd, buf, len);
+ if (nr < 0) {
+ if (errno == EINTR)
+ continue;
+ if (handle_nonblock(fd, POLLOUT, errno))
+ continue;
+ }
+
+ return nr;
+ }
+}
+
+/*
+ * xpread() is the same as pread(), but it automatically restarts pread()
+ * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES
+ * NOT GUARANTEE that "len" bytes is read even if the data is available.
+ */
+ssize_t xpread(int fd, void *buf, size_t len, off_t offset)
+{
+ ssize_t nr;
+ if (len > MAX_IO_SIZE)
+ len = MAX_IO_SIZE;
+ while (1) {
+ nr = pread(fd, buf, len, offset);
if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
continue;
return nr;
return total;
}
+ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset)
+{
+ char *p = buf;
+ ssize_t total = 0;
+
+ while (count > 0) {
+ ssize_t loaded = xpread(fd, p, count, offset);
+ if (loaded < 0)
+ return -1;
+ if (loaded == 0)
+ return total;
+ count -= loaded;
+ p += loaded;
+ total += loaded;
+ offset += loaded;
+ }
+
+ return total;
+}
+
int xdup(int fd)
{
int ret = dup(fd);
return ret;
}
+/**
+ * xfopen() is the same as fopen(), but it die()s if the fopen() fails.
+ */
+FILE *xfopen(const char *path, const char *mode)
+{
+ for (;;) {
+ FILE *fp = fopen(path, mode);
+ if (fp)
+ return fp;
+ if (errno == EINTR)
+ continue;
+
+ if (*mode && mode[1] == '+')
+ die_errno(_("could not open '%s' for reading and writing"), path);
+ else if (*mode == 'w' || *mode == 'a')
+ die_errno(_("could not open '%s' for writing"), path);
+ else
+ die_errno(_("could not open '%s' for reading"), path);
+ }
+}
+
FILE *xfdopen(int fd, const char *mode)
{
FILE *stream = fdopen(fd, mode);
return stream;
}
+FILE *fopen_for_writing(const char *path)
+{
+ FILE *ret = fopen(path, "w");
+
+ if (!ret && errno == EPERM) {
+ if (!unlink(path))
+ ret = fopen(path, "w");
+ else
+ errno = EPERM;
+ }
+ return ret;
+}
+
+static void warn_on_inaccessible(const char *path)
+{
+ warning_errno(_("unable to access '%s'"), path);
+}
+
+int warn_on_fopen_errors(const char *path)
+{
+ if (errno != ENOENT && errno != ENOTDIR) {
+ warn_on_inaccessible(path);
+ return -1;
+ }
+
+ return 0;
+}
+
+FILE *fopen_or_warn(const char *path, const char *mode)
+{
+ FILE *fp = fopen(path, mode);
+
+ if (fp)
+ return fp;
+
+ warn_on_fopen_errors(path);
+ return NULL;
+}
+
int xmkstemp(char *template)
{
int fd;
int saved_errno = errno;
const char *nonrelative_template;
- if (!template[0])
+ if (strlen(template) != strlen(origtemplate))
template = origtemplate;
nonrelative_template = absolute_path(template);
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
template[5] = letters[v % num_letters]; v /= num_letters;
fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
- if (fd > 0)
+ if (fd >= 0)
return fd;
/*
* Fatal error (EPERM, ENOSPC etc).
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;
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;
- }
- }
+ int err;
+ if (!rc || errno == ENOENT)
+ return 0;
+ err = errno;
+ warning_errno("unable to %s %s", op, file);
+ errno = err;
return rc;
}
+int unlink_or_msg(const char *file, struct strbuf *err)
+{
+ int rc = unlink(file);
+
+ assert(err);
+
+ if (!rc || errno == ENOENT)
+ return 0;
+
+ strbuf_addf(err, "unable to unlink %s: %s",
+ file, strerror(errno));
+ return -1;
+}
+
int unlink_or_warn(const char *file)
{
return warn_if_unremovable("unlink", file, unlink(file));
return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
}
-void warn_on_inaccessible(const char *path)
+static int access_error_is_ok(int err, unsigned flag)
{
- warning(_("unable to access '%s': %s"), path, strerror(errno));
+ return (is_missing_file_error(err) ||
+ ((flag & ACCESS_EACCES_OK) && err == EACCES));
}
-int access_or_warn(const char *path, int mode)
+int access_or_warn(const char *path, int mode, unsigned flag)
{
int ret = access(path, mode);
- if (ret && errno != ENOENT)
+ if (ret && !access_error_is_ok(errno, flag))
warn_on_inaccessible(path);
return ret;
}
-struct passwd *xgetpwuid_self(void)
+int access_or_die(const char *path, int mode, unsigned flag)
{
- struct passwd *pw;
+ int ret = access(path, mode);
+ if (ret && !access_error_is_ok(errno, flag))
+ die_errno(_("unable to access '%s'"), path);
+ return ret;
+}
- errno = 0;
- pw = getpwuid(getuid());
- if (!pw)
- die(_("unable to look up current user in the passwd file: %s"),
- errno ? strerror(errno) : _("no such user"));
- return pw;
+char *xgetcwd(void)
+{
+ struct strbuf sb = STRBUF_INIT;
+ if (strbuf_getcwd(&sb))
+ die_errno(_("unable to get current working directory"));
+ return strbuf_detach(&sb, NULL);
+}
+
+int xsnprintf(char *dst, size_t max, const char *fmt, ...)
+{
+ va_list ap;
+ int len;
+
+ va_start(ap, fmt);
+ len = vsnprintf(dst, max, fmt, ap);
+ va_end(ap);
+
+ if (len < 0)
+ die("BUG: your snprintf is broken");
+ if (len >= max)
+ die("BUG: attempt to snprintf into too-small buffer");
+ return len;
+}
+
+void write_file_buf(const char *path, const char *buf, size_t len)
+{
+ int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+ if (write_in_full(fd, buf, len) != len)
+ die_errno(_("could not write to %s"), path);
+ if (close(fd))
+ die_errno(_("could not close %s"), path);
+}
+
+void write_file(const char *path, const char *fmt, ...)
+{
+ va_list params;
+ struct strbuf sb = STRBUF_INIT;
+
+ va_start(params, fmt);
+ strbuf_vaddf(&sb, fmt, params);
+ va_end(params);
+
+ strbuf_complete_line(&sb);
+
+ write_file_buf(path, sb.buf, sb.len);
+ strbuf_release(&sb);
+}
+
+void sleep_millisec(int millisec)
+{
+ poll(NULL, 0, millisec);
+}
+
+int xgethostname(char *buf, size_t len)
+{
+ /*
+ * If the full hostname doesn't fit in buf, POSIX does not
+ * specify whether the buffer will be null-terminated, so to
+ * be safe, do it ourselves.
+ */
+ int ret = gethostname(buf, len);
+ if (!ret)
+ buf[len - 1] = 0;
+ return ret;
}
projects / platform / upstream / git.git / blobdiff