C Standard Library¶
malloc
(size::Integer) → Ptr{Void}¶Call
malloc
from the C standard library.
calloc
(num::Integer, size::Integer) → Ptr{Void}¶Call
calloc
from the C standard library.
realloc
(addr::Ptr, size::Integer) → Ptr{Void}¶Call
realloc
from the C standard library.See warning in the documentation for
free
regarding only using this on memory originally obtained frommalloc
.
free
(addr::Ptr)¶Call
free
from the C standard library. Only use this on memory obtained frommalloc
, not on pointers retrieved from other C libraries.Ptr
objects obtained from C libraries should be freed by the free functions defined in that library, to avoid assertion failures if multiplelibc
libraries exist on the system.
errno
([code])¶Get the value of the C library’s
errno
. If an argument is specified, it is used to set the value oferrno
.The value of
errno
is only valid immediately after accall
to a C library routine that sets it. Specifically, you cannot callerrno
at the next prompt in a REPL, because lots of code is executed between prompts.
strerror
(n=errno())¶Convert a system call error code to a descriptive string
GetLastError
()¶Call the Win32
GetLastError
function [only available on Windows].
FormatMessage
(n=GetLastError())¶Convert a Win32 system call error code to a descriptive string [only available on Windows].
time
(t::TmStruct)¶Converts a
TmStruct
struct to a number of seconds since the epoch.
strftime
([format, ]time)¶Convert time, given as a number of seconds since the epoch or a
TmStruct
, to a formatted string using the given format. Supported formats are the same as those in the standard C library.
strptime
([format, ]timestr)¶Parse a formatted time string into a
TmStruct
giving the seconds, minute, hour, date, etc. Supported formats are the same as those in the standard C library. On some platforms, timezones will not be parsed correctly. If the result of this function will be passed totime
to convert it to seconds since the epoch, theisdst
field should be filled in manually. Setting it to-1
will tell the C library to use the current system settings to determine the timezone.
TmStruct
([seconds])¶Convert a number of seconds since the epoch to broken-down format, with fields
sec
,min
,hour
,mday
,month
,year
,wday
,yday
, andisdst
.
flush_cstdio
()¶Flushes the C
stdout
andstderr
streams (which may have been written to by external C code).
msync
(ptr, len[, flags])¶Forces synchronization of the
mmap()
ped memory region fromptr
toptr+len
. Flags defaults toMS_SYNC
, but can be a combination ofMS_ASYNC
,MS_SYNC
, orMS_INVALIDATE
. See your platform man page for specifics. The flags argument is not valid on Windows.You may not need to call
msync
, because synchronization is performed at intervals automatically by the operating system. However, you can call this directly if, for example, you are concerned about losing the result of a long-running calculation.
MS_ASYNC
¶Enum constant for
msync()
. See your platform man page for details. (not available on Windows).