getCwdAlloc
Caller must free the returned memory. On Windows, the result is encoded as WTF-8. On other platforms, the result is an opaque sequence of bytes with no particular encoding.
Function parameters
Parameters
Type definitions in this namespace
Types
- ArgIteratorWindows
- Iterator that implements the Windows command-line parsing algorithm.
- ArgIteratorGeneralOptions
- Optional parameters for `ArgIteratorGeneral`
- ArgIterator
- Cross-platform command line argument iterator.
Functions in this namespace
Functions
- getCwd
- The result is a slice of `out_buffer`, from index `0`.
- getCwdAlloc
- Caller must free the returned memory.
- getEnvMap
- Returns a snapshot of the environment variables of the current process.
- getEnvVarOwned
- Caller must free returned memory.
- hasEnvVarConstant
- On Windows, `key` must be valid WTF-8.
- hasNonEmptyEnvVarConstant
- On Windows, `key` must be valid WTF-8.
- parseEnvVarInt
- Parses an environment variable as an integer.
- hasEnvVar
- On Windows, if `key` is not valid [WTF-8](https://simonsapin.github.io/wtf-8/),
- hasNonEmptyEnvVar
- On Windows, if `key` is not valid [WTF-8](https://simonsapin.github.io/wtf-8/),
- getenvW
- Windows-only.
- ArgIteratorGeneral
- A general Iterator to parse a string into a set of arguments
- args
- Holds the command-line arguments, with the program name as the first entry.
- argsWithAllocator
- You must deinitialize iterator's internal buffers by calling `deinit` when done.
- argsAlloc
- Caller must call argsFree on result.
- getUserInfo
- POSIX function which gets a uid from username.
- posixGetUserInfo
- TODO this reads /etc/passwd.
- execv
- Replaces the current process image with the executed process.
- execve
- Replaces the current process image with the executed process.
- totalSystemMemory
- Returns the total system memory, in bytes as a u64.
- cleanExit
- Indicate that we are now terminating with a successful exit code.
- raiseFileDescriptorLimit
- Raise the open file descriptor limit.
- createEnvironFromMap
- Creates a null-delimited environment variable block in the format
- createEnvironFromExisting
- Creates a null-delimited environment variable block in the format
- createWindowsEnvBlock
- Caller must free result.
- fatal
- Logs an error and then terminates the process with exit code 1.
Error sets in this namespace
Error Sets
Tells whether calling the `execv` or `execve` functions will be a compile error.
Values
Source
Implementation
pub fn getCwdAlloc(allocator: Allocator) ![]u8 {
// The use of max_path_bytes here is just a heuristic: most paths will fit
// in stack_buf, avoiding an extra allocation in the common case.
var stack_buf: [fs.max_path_bytes]u8 = undefined;
var heap_buf: ?[]u8 = null;
defer if (heap_buf) |buf| allocator.free(buf);
var current_buf: []u8 = &stack_buf;
while (true) {
if (posix.getcwd(current_buf)) |slice| {
return allocator.dupe(u8, slice);
} else |err| switch (err) {
error.NameTooLong => {
// The path is too long to fit in stack_buf. Allocate geometrically
// increasing buffers until we find one that works
const new_capacity = current_buf.len * 2;
if (heap_buf) |buf| allocator.free(buf);
current_buf = try allocator.alloc(u8, new_capacity);
heap_buf = current_buf;
},
else => |e| return e,
}
}
}