# C Standard Library

Base.Libc.callocFunction
calloc(num::Integer, size::Integer) -> Ptr{Cvoid}

Call calloc from the C standard library.

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Base.Libc.freeFunction
free(addr::Ptr)

Call free from the C standard library. Only use this on memory obtained from malloc, 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 multiple libc libraries exist on the system.

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Base.Libc.errnoFunction
errno([code])

Get the value of the C library's errno. If an argument is specified, it is used to set the value of errno.

The value of errno is only valid immediately after a ccall to a C library routine that sets it. Specifically, you cannot call errno at the next prompt in a REPL, because lots of code is executed between prompts.

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Base.Libc.timeMethod
time(t::TmStruct)

Converts a TmStruct struct to a number of seconds since the epoch.

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Base.Libc.strftimeFunction
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.

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Base.Libc.strptimeFunction
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 to time to convert it to seconds since the epoch, the isdst 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.

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Base.Libc.TmStructType
TmStruct([seconds])

Convert a number of seconds since the epoch to broken-down format, with fields sec, min, hour, mday, month, year, wday, yday, and isdst.

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Base.Libc.flush_cstdioFunction
flush_cstdio()

Flushes the C stdout and stderr streams (which may have been written to by external C code).

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Base.Libc.systemsleepFunction
systemsleep(s::Real)

Suspends execution for s seconds. This function does not yield to Julia's scheduler and therefore blocks the Julia thread that it is running on for the duration of the sleep time.

See also sleep.

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