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ad6df8a3c8
This allows creating pipes for subprocesses to use as stdin/out/err and polling them from a uloop process. Signed-off-by: Felix Fietkau <nbd@nbd.name>
76 lines
1.8 KiB
Diff
76 lines
1.8 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 8 Oct 2025 22:15:42 +0200
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Subject: [PATCH] fs: add dup2() function
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Add dup2() function to duplicate file descriptors, useful for redirecting
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standard streams in child processes.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/lib/fs.c
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+++ b/lib/fs.c
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@@ -1278,6 +1278,54 @@ uc_fs_fdopen(uc_vm_t *vm, size_t nargs)
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return ucv_resource_create(vm, "fs.file", fp);
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}
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+/**
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+ * Duplicates a file descriptor.
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+ *
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+ * This function duplicates the file descriptor `oldfd` to `newfd`. If `newfd`
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+ * was previously open, it is silently closed before being reused.
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+ *
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+ * Returns `true` on success.
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+ * Returns `null` on error.
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+ *
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+ * @function module:fs#dup2
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+ *
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+ * @param {number} oldfd
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+ * The file descriptor to duplicate.
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+ *
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+ * @param {number} newfd
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+ * The file descriptor number to duplicate to.
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+ *
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+ * @returns {?boolean}
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+ *
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+ * @example
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+ * // Redirect stderr to a log file
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+ * const logfile = open('/tmp/error.log', 'w');
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+ * dup2(logfile.fileno(), 2);
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+ * logfile.close();
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+ */
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+static uc_value_t *
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+uc_fs_dup2(uc_vm_t *vm, size_t nargs)
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+{
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+ uc_value_t *oldfd_arg = uc_fn_arg(0);
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+ uc_value_t *newfd_arg = uc_fn_arg(1);
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+ int oldfd, newfd;
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+
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+ oldfd = get_fd(vm, oldfd_arg);
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+
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+ if (oldfd == -1)
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+ err_return(errno ? errno : EBADF);
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+
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+ newfd = get_fd(vm, newfd_arg);
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+
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+ if (newfd == -1)
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+ err_return(errno ? errno : EBADF);
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+
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+ if (dup2(oldfd, newfd) == -1)
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+ err_return(errno);
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+
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+ return ucv_boolean_new(true);
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+}
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+
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/**
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* Represents a handle for interacting with a directory opened by `opendir()`.
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@@ -2890,6 +2938,7 @@ static const uc_function_list_t global_f
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{ "error", uc_fs_error },
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{ "open", uc_fs_open },
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{ "fdopen", uc_fs_fdopen },
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+ { "dup2", uc_fs_dup2 },
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{ "opendir", uc_fs_opendir },
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{ "popen", uc_fs_popen },
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{ "readlink", uc_fs_readlink },
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